Bug 1870227 (CVE-2020-16297)

Summary:	CVE-2020-16297 ghostscript: buffer overflow in FloydSteinbergDitheringC() in contrib/gdevbjca.c could result in a DoS
Product:	[Other] Security Response	Reporter:	Michael Kaplan <mkaplan>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	amasferr, chazlett, deekej, mosvald, twaugh, zdohnal
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	ghostscript 9.51	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-05-18 20:35:19 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:	1870228, 1872063, 1872064
Bug Blocks:	1870273

Description Michael Kaplan 2020-08-19 15:10:08 UTC

A buffer overflow vulnerability in FloydSteinbergDitheringC() in contrib/gdevbjca.c of Artifex Software GhostScript v9.50 allows a remote attacker to cause a denial of service via a crafted PDF file. This is fixed in v9.51.

References:

https://bugs.ghostscript.com/show_bug.cgi?id=701800
https://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=bf72f1a3dd5392ee8291e3b1518a0c2c5dc6ba39

Comment 1 Michael Kaplan 2020-08-19 15:10:48 UTC

Created ghostscript tracking bugs for this issue:

Affects: fedora-all [bug 1870228]

Comment 3 Todd Cullum 2020-08-24 22:58:10 UTC

Flaw summary:

FloydSteinbergDitheringC() in /contrib/gdevbjca.c processes gamma tables row-by-row and could perform a buffer overread if row data was too large. Since the row data is collected from a PDF, an attacker would need to supply a crafted PDF to be parsed by ghostscript in order to potentially cause a denial of service.

Comment 5 Todd Cullum 2020-08-24 22:59:16 UTC

Mitigation:

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Comment 6 errata-xmlrpc 2021-05-18 15:37:00 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:1852 https://access.redhat.com/errata/RHSA-2021:1852

Comment 7 Product Security DevOps Team 2021-05-18 20:35:19 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-2020-16297