cve/2019/CVE-2019-20633.md

### [CVE-2019-20633](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-20633)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

GNU patch through 2.7.6 contains a free(p_line[p_end]) Double Free vulnerability in the function another_hunk in pch.c that can cause a denial of service via a crafted patch file. NOTE: this issue exists because of an incomplete fix for CVE-2018-6952.

### POC

#### Reference
- https://savannah.gnu.org/bugs/index.php?56683
- https://savannah.gnu.org/bugs/index.php?56683

#### Github
- https://github.com/strongcourage/uafbench
- https://github.com/strongcourage/uafuzz