# Dirty Pipe: CVE-2022-0847

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<https://tryhackme.com/room/dirtypipe>
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| Room Attributes       | Value                                                                  |
| --------------------- | ---------------------------------------------------------------------- |
| Subscription Required | <mark style="color:green;background-color:green;">False</mark> \[Free] |
| Type                  | Walkthrough                                                            |
| Difficulty            | <mark style="color:blue;background-color:blue;">Info</mark>            |
| Tags                  | Dirty Pipe, CVE-2022-0847, Linux, Kernel                               |

## Task 1 - <mark style="color:green;background-color:green;">Info</mark> 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 - <mark style="color:purple;background-color:purple;">Tutorial</mark> Vulnerability Background

### Read the information in the task and understand how Dirty Pipe works.

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## Task 3 - <mark style="color:orange;background-color:orange;">Practical</mark> A Weaponised PoC

### Follow along with the steps described in the task if you haven't already done so.

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### Switch user (`su`) into your newly created root account. What is the flag found in the `/root/flag.txt` file?

<details>

<summary>Reveal Flag <span data-gb-custom-inline data-tag="emoji" data-code="1f6a9">🚩</span></summary>

:triangular\_flag\_on\_post:`THM{MmU4Zjg0NDdjNjFiZWM5ZjUyZGEyMzlm}`

</details>

### 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.

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## Task 4 - <mark style="color:orange;background-color:orange;">Practical</mark> <mark style="color:blue;background-color:blue;">Bonus Task</mark> A Second Exploit

### Exploit the target using bl4sty's exploit for Dirty Pipe

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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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### **\[**<mark style="color:purple;">**Optional**</mark>**]** 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.

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## Task 5 - <mark style="color:green;background-color:green;">Info</mark> Conclusion

### I understand the Dirty Pipe vulnerability!

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