Bug 1847608 (CVE-2020-14150)

Summary:	CVE-2020-14150 bison: allows attackers to cause a denial of service
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
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, ashankar, emachado, me, pfrankli
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	bison 3.5.4	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-11-01 17:13:11 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:	1847609, 1881232, 1881233
Bug Blocks:	1847611

Description Guilherme de Almeida Suckevicz 2020-06-16 16:56:00 UTC

GNU Bison before 3.5.4 allows attackers to cause a denial of service (application crash).

Reference:
https://lists.gnu.org/archive/html/info-gnu/2020-04/msg00000.html

Comment 1 Guilherme de Almeida Suckevicz 2020-06-16 16:56:20 UTC

Created bison tracking bugs for this issue:

Affects: fedora-all [bug 1847609]

Comment 3 Todd Cullum 2020-09-16 22:08:44 UTC

Mitigation:

To mitigate this flaw, do not use Bison on untrusted input.

Comment 9 Todd Cullum 2020-09-21 22:05:36 UTC

The CVE seems to encapsulate several heap buffer overflows and assertion failures found listed as "[bison crash]" on [1]. Most of the issues stem from the same flawed code that is patched in [2]. All issues require untrusted input to be provided to bison, and likely will lead to bison crashing.

1. https://lists.gnu.org/archive/html/bug-bison/2020-03/index.html
2. https://github.com/akimd/bison/commit/641e326303753575664ca146fee7e9148d6bf5cf