Bug 1870262 (CVE-2020-16304)

Summary:	CVE-2020-16304 ghostscript: buffer overflow in image_render_color_thresh() in base/gxicolor.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 20:35:57 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:	1870264, 1872888, 1872889
Bug Blocks:	1870273

Description Michael Kaplan 2020-08-19 15:35:00 UTC

A buffer overflow vulnerability in image_render_color_thresh() in base/gxicolor.c of Artifex Software GhostScript v9.50 allows a remote attacker to escalate privileges via a crafted eps file. This is fixed in v9.51.

References:

http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=027c546e0dd11e0526f1780a7f3c2c66acffe209
https://bugs.ghostscript.com/show_bug.cgi?id=701816

Comment 1 Michael Kaplan 2020-08-19 15:35:24 UTC

Created ghostscript tracking bugs for this issue:

Affects: fedora-all [bug 1870264]

Comment 2 Todd Cullum 2020-08-26 19:46:03 UTC

Flaw summary:

In image_render_color_thresh() from file /base/gxicolor.c, the `position` variable was being decremented per component instead of per-pixel, which could lead to a heap buffer overflow for CMYK and Monochrome landscapes. The addresssanitizer output would not reproduce for me on ghostscript-9.25 but the source code in the package does reflect that this bug may exist in the code. An attacker would need to supply a crafted PDF file to trigger this flaw and cause a potential denial of service.

Comment 4 Todd Cullum 2020-08-26 20:04:24 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 15:37:23 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 20:35:57 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-2020-16304

Comment 8 Product Security DevOps Team 2021-05-19 02:33:44 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-2020-16304