Bug 1818934 (CVE-2019-20633)

Summary:	CVE-2019-20633 patch: double free in another_hunk function in pch.c
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	kyoshida, than, twaugh
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A vulnerability was found in GNU Patch due to a double-free issue in the another_hunk function within pch.c, where an attacker could exploit this flaw to cause memory corruption, leading the application to crash and resulting in a denial of service.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1818938, 1819277, 1819278
Bug Blocks:	1818937

Description Guilherme de Almeida Suckevicz 2020-03-30 18:10:22 UTC

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.

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

Comment 1 Guilherme de Almeida Suckevicz 2020-03-30 18:11:29 UTC

Created patch tracking bugs for this issue:

Affects: fedora-all [bug 1818938]