Bug 1870257 (CVE-2020-16305)

Summary:	CVE-2020-16305 ghostscript: buffer overflow in pcx_write_rle() in contrib/japanese/gdev10v.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 20:35:51 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:	1870260, 1872501, 1872502
Bug Blocks:	1870273

Description Michael Kaplan 2020-08-19 15:34:05 UTC

A buffer overflow vulnerability in pcx_write_rle() in contrib/japanese/gdev10v.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=701819
https://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=2793769ff107d8d22dadd30c6e68cd781b569550

Comment 1 Michael Kaplan 2020-08-19 15:34:52 UTC

Created ghostscript tracking bugs for this issue:

Affects: fedora-all [bug 1870260]

Comment 2 Todd Cullum 2020-08-25 22:36:40 UTC

Flaw summary:

Incorrect if statement conditional order in pcx_write_rle() could allow the dereference of an out-of-bounds pointer `from`. This is possible because there is a while loop in which `from` is incremented before the line:

if (data != *from || from == end)

Therefore, it's possible that from is incremented past the end of the buffer and then dereferenced in the first comparison. The patch reverses these comparisons to ensure that is not possible.

Comment 5 errata-xmlrpc 2021-05-18 15:37:18 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 6 Product Security DevOps Team 2021-05-18 20:35:51 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-2020-16305