Bug 1870244 (CVE-2020-16289)

Summary:	CVE-2020-16289 ghostscript: buffer overflow in cif_print_page() in devices/gdevcif.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:	low	Docs Contact:
Priority:	low
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 20:35:38 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:	1870245, 1872484, 1872486
Bug Blocks:	1870273

Description Michael Kaplan 2020-08-19 15:21:55 UTC

A buffer overflow vulnerability in cif_print_page() in devices/gdevcif.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=701788
https://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=d31e25ed5b130499e0d880e4609b1b4824699768

Comment 1 Michael Kaplan 2020-08-19 15:22:26 UTC

Created ghostscript tracking bugs for this issue:

Affects: fedora-all [bug 1870245]

Comment 3 Todd Cullum 2020-08-25 21:30:16 UTC

Flaw Summary:

In cif_print_page() routine of /devices/gdevcif.c, the malloc() call does not leave space for a NULL string terminator, resulting in an out-of-bounds write of length 1 during the sunsequent operation `*(s + length) = '\0';` The patch[1] adds 1 to length to account for the null terminator, thus mitigating this flaw.


1. https://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=d31e25ed5b130499e0d880e4609b1b4824699768;hp=6e6c69487094b877bc56fcc07b9840f6e5b95925

Comment 4 Todd Cullum 2020-08-25 21:32:09 UTC

Moving to Low as this is just a 1 byte out-of-bounds write whose data is not controlled by a potential attacker.

Comment 5 Todd Cullum 2020-08-25 21:32:11 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 8 errata-xmlrpc 2021-05-18 15:37:13 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 9 Product Security DevOps Team 2021-05-18 20:35:38 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-2020-16289