Bug 1642578 (CVE-2018-17961)

Summary:	CVE-2018-17961 ghostscript: Saved execution stacks can leak operator arrays (incomplete fix for CVE-2018-17183)
Product:	[Other] Security Response	Reporter:	Laura Pardo <lpardo>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	mosvald, twaugh, zdohnal
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	ghostscript 9.26	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-12-18 08:53:43 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:	1642579, 1642580, 1648891, 1648892
Bug Blocks:	1632473

Description Laura Pardo 2018-10-24 17:29:35 UTC

Artifex Ghostscript 9.25 and earlier allows attackers to bypass a sandbox protection mechanism via vectors involving errorhandler setup. This issue exists because of an incomplete fix for CVE-2018-17183. 

References:
https://bugs.chromium.org/p/project-zero/issues/detail?id=1682&desc=2 
https://bugs.ghostscript.com/show_bug.cgi?id=699816
http://www.openwall.com/lists/oss-security/2018/10/09/4 

Upstream Patch:
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=a54c9e61e7d0 
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=a5a9bf8c6a63 
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=a6807394bd94

Comment 1 Laura Pardo 2018-10-24 17:30:13 UTC

Created ghostscript tracking bugs for this issue:

Affects: fedora-all [bug 1642579]

Comment 7 errata-xmlrpc 2018-12-17 19:58:22 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:3834 https://access.redhat.com/errata/RHSA-2018:3834

Comment 8 Cedric Buissart 2018-12-18 08:53:45 UTC

Statement:

Red Hat Enterprise Linux 6 is now in Maintenance Support 2 Phase of the support and maintenance life cycle. This has been rated as having a security impact of Important, and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.

Comment 9 Cedric Buissart 2018-12-18 08:53:47 UTC

Mitigation:

Please refer to the "Mitigation" section of CVE-2018-16509 : https://access.redhat.com/security/cve/cve-2018-16509