openkylin-exploit-db/cve/linux-kernel/2022/CVE-2022-0847

What is this

This is Max Kellermann's proof of concept for Dirty Pipe, but modified to overwrite root's password field in /etc/passwd and restore after popping a root shell.

Side Note: I do not claim any credit for finding this vulnerability or writing the proof of concept. This exploit is merely a small modification of Kellermann's proof of concept to enable quick/easy exploitation. Please read the original article on this extremely interesting vulnerability @ https://dirtypipe.cm4all.com/ when you get the opportunity. It really does deserve your time to understand it.

How to use this

1. Compile with ./compile.sh (assumes gcc is installed)
2. Run ./exploit and it'll pop a root shell

su: must be run from a terminal

If you get this error message:

1. Login as root with the password aaron.
2. Then, restore /etc/passwd by running mv /tmp/passwd.bak /etc/passwd

(oops sorry my laptop battery is dying and my charger broke so I don't have time to fix this the right now, sorry)

漏洞编号

CVE-2022-0847

漏洞等级

高危

漏洞简介

Linux kernel 存在安全漏洞，该漏洞源于新管道缓冲区结构的“flag”变量在 Linux 内核中的 copy_page_to_iter_pipe 和 push_pipe 函数中缺乏正确初始化。非特权本地用户利用该漏洞可以提升权限至root。以下产品和版本受到影响：Linux Kernel 5.8-5.16.11、5.8-5.15.25、5.8-5.10.102。

漏洞类型

权限提升

漏洞检测程序来源

• https://github.com/Arinerron/CVE-2022-0847-DirtyPipe-Exploit

补丁链接

• https://git.kernel.org/linus/9d2231c5d74e13b2a0546fee6737ee4446017903

参考

• https://www.openwall.com/lists/oss-security/2022/03/07/1