Bug 1625851 (CVE-2018-16543)

Summary:	CVE-2018-16543 ghostscript: gssetresolution and gsgetresolution memory corruption (699670)
Product:	[Other] Security Response	Reporter:	Sam Fowler <sfowler>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	cbuissar, mosvald, twaugh, zdohnal
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	ghostscript 9.24	Doc Type:	If docs needed, set a value
Doc Text:	It was discovered that the ghostscript gssetresolution and gsgetresolution procedures were available, although they have dangerous side effects. An attacker could possibly exploit this to bypass the -dSAFER protection and crash ghostscript or, possibly, execute arbitrary code in the ghostscript context via a specially crafted PostScript document.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-10 10:37:30 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:	1625852, 1625853, 1653614
Bug Blocks:	1619570

Description Sam Fowler 2018-09-06 05:31:01 UTC

In Artifex Ghostscript before 9.24, gssetresolution and gsgetresolution allow attackers to have an unspecified impact.


External Reference:

https://www.kb.cert.org/vuls/id/332928
https://www.artifex.com/news/ghostscript-security-resolved/


Upstream Bug:

https://bugs.ghostscript.com/show_bug.cgi?id=699670


Upstream Patches:

http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=f52734ba87
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=c9b362ba908c
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=5b5536fa88a9

Comment 1 Sam Fowler 2018-09-06 05:31:32 UTC

Created ghostscript tracking bugs for this issue:

Affects: fedora-all [bug 1625852]

Comment 9 Cedric Buissart 2018-11-27 11:56:14 UTC

Upstream Patches:

http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=f52734ba87
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=c9b362ba908c
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=5b5536fa88a9

Comment 10 Cedric Buissart 2019-02-12 09:22:49 UTC

Statement:

CVE-2018-16543 requires the "device subclassing" feature to be present in ghostscript in order to exploit it and corrupt the interpreter's memory. This feature appeared in Ghostscript-9.18. Thus ghostscript 9.07, as shipped in Red Hat Enterprise Linux 7, and older are not affected : although the attacker has access to the gssetresolution and gsgetresolution operators, they can not use these to corrupt memory.