Bug 1870237 (CVE-2020-16292)

Summary:	CVE-2020-16292 ghostscript: buffer overflow in mj_raster_cmd() in contrib/japanese/gdevmjc.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, jlyle, 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 20:35:28 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:	1870238, 1872073, 1872074
Bug Blocks:	1870273

Description Michael Kaplan 2020-08-19 15:17:39 UTC

A buffer overflow vulnerability in mj_raster_cmd() in contrib/japanese/gdevmjc.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=701793
https://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=863ada11f9a942a622a581312e2be022d9e2a6f7

Comment 1 Michael Kaplan 2020-08-19 15:18:47 UTC

Created ghostscript tracking bugs for this issue:

Affects: fedora-all [bug 1870238]

Comment 3 Todd Cullum 2020-08-25 00:17:50 UTC

Flaw Summary:

A for loop condition in mj_raster_cmd() of /contrib/japanese/gdevmjc.c could cause a heap buffer overflow -> out-of-bounds read because the condition should be in reverse order. In:

for( q++ ; *q == *p && q < in_end ; q++ )

There is a check for whether q < in_end but the check occurs after q has already been dereferenced. The patch checks if q < in_end first, before dereferencing it.

Comment 4 Todd Cullum 2020-08-25 00:19:07 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 15:37:04 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 20:35:28 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-2020-16292

Comment 8 Product Security DevOps Team 2021-05-19 02:33:42 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-2020-16292