Bug 1877779 (CVE-2020-24980)

Summary:	CVE-2020-24980 bison: Assertion failure in src/parse-gram.c could result in DoS
Product:	[Other] Security Response	Reporter:	Michael Kaplan <mkaplan>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	arjun.is, ashankar, emachado, me, pfrankli, tcullum
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-09-15 01:17:44 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1877780
Bug Blocks:	1877775

Description Michael Kaplan 2020-09-10 12:24:25 UTC

An assertion failure was found in src/parse-gram.c in GNU bison 3.7.1.1-cb7dc-dirty. A local attacker may execute bison with crafted input file containing character '\' at the end and while still in a character or a string.

References:

https://github.com/akimd/bison/commit/b801b7b670872b8a31d11b3683b4afc3e45a07f8
https://lists.gnu.org/r/bug-bison/2020-08/msg00009.html

Comment 1 Michael Kaplan 2020-09-10 12:24:46 UTC

Created bison tracking bugs for this issue:

Affects: fedora-all [bug 1877780]

Comment 4 Todd Cullum 2020-09-14 22:07:26 UTC

Statement:

This flaw does not affect bison as shipped in Red Hat Enterprise Linux 7 or 8 as it is was introduced in a subsequent version of bison.

Comment 5 Product Security DevOps Team 2020-09-15 01:17:44 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-2020-24980