CVE-2016-5195 PoC — Linux kernel 竞争条件问题漏洞

Source

Associated Vulnerability

Title: Linux kernel 竞争条件问题漏洞 (CVE-2016-5195)
Description:Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect handling of a copy-on-write (COW) feature to write to a read-only memory mapping, as exploited in the wild in October 2016, aka "Dirty COW."

Description

DirtyCow root privilege escalation (CVE-2016-5195)

Readme

# root-dirtyc0w (CVE-2016-5195)
### DirtyCow root privilege escalation
Dirty COW was a race-condition vulnerability in the Linux kernel. This vulnerability lived inside the kernel functions which handle the copy-on-write (COW) feature of memory mappings and when exploited allowed processes to write to read-only files.  

An example use case of this vulnerability includes overwriting any SUID (Set User ID) binary such as passwd executable with a different elf executable (which we create) that executes /bin/sh to gain root privileges (as shown in this repository).  

You can find more executables in Linux that have the SUID bit set and change them in the exploit code here: https://pentestlab.blog/2017/09/25/suid-executables/

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    <img src="/assets/gif/root-dirtyc0w.gif" alt="root-dirtyc0w PoC GIF" width = 70% style="display: block; border: none;">
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  <p style="margin-top: 5px;"><em>Privilege Escalation PoC: Exploiting Dirty COW for Root Access (CVE-2016-5195) - Ran on Kali Linux 2016.2</em></p>
</div>

File Snapshot

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