Bug 1984646 (CVE-2021-36976)

Summary:	CVE-2021-36976 libarchive: use-after-free in copy_string()
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	bdettelb, caswilli, databases-maint, dmoppert, fjansen, kaycoth, ljavorsk, mike, ndevos, panovotn, pkubat, praiskup, psegedy, tomckay, vmugicag
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 use-after-free flaw was found in libarchive in the copy_string function.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-05-17 13:15:11 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1984647, 1984648, 1985190
Bug Blocks:	1984649

Description Guilherme de Almeida Suckevicz 2021-07-21 20:10:55 UTC

libarchive 3.4.1 through 3.5.1 has a use-after-free in copy_string (called from do_uncompress_block and process_block).

Reference:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32375

Comment 1 Guilherme de Almeida Suckevicz 2021-07-21 20:11:47 UTC

Created libarchive tracking bugs for this issue:

Affects: fedora-all [bug 1984647]


Created mingw-libarchive tracking bugs for this issue:

Affects: fedora-all [bug 1984648]

Comment 2 Doran Moppert 2021-07-22 06:07:39 UTC

This appears to not have been reported upstream.  

Attaching a patch that adds the test against the first upstream affected commit (47bb8187).  Running that test with asan results in UAF .. but the UAF region was allocated by the previous test, so it looks like something not initialized properly when reading the reproducer.

Comment 18 Product Security DevOps Team 2022-05-17 13:15:08 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-36976