Bug 1625839 (CVE-2018-16539)

Summary:	CVE-2018-16539 ghostscript: incorrect access checking in temp file handling to disclose contents of files (699658)
Product:	[Other] Security Response	Reporter:	Sam Fowler <sfowler>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	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 did not properly restrict access to files open prior to enabling the -dSAFER mode. An attacker could possibly exploit this to bypass the -dSAFER protection and disclose the content of affected files via a specially crafted PostScript document.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-11-28 15:50:19 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:	1625840, 1625841, 1649721, 1649722
Bug Blocks:	1619570

Description Sam Fowler 2018-09-06 05:19:33 UTC

In Artifex Ghostscript before 9.24, attackers able to supply crafted PostScript files could use incorrect access checking in temp file handling to disclose contents of files on the system otherwise not readable.


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=699658


Upstream Patch:

http://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=a054156d

Comment 1 Sam Fowler 2018-09-06 05:20:01 UTC

Created ghostscript tracking bugs for this issue:

Affects: fedora-all [bug 1625840]

Comment 4 Stefan Cornelius 2018-09-20 11:20:39 UTC

Statement:

This issue affects the versions of ghostscript as shipped with Red Hat Enterprise Linux 5, 6, and 7.

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 Moderate, 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/.

Red Hat Enterprise Linux 5 is now in Extended Life Phase of the support and maintenance life cycle. This issue 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 7 errata-xmlrpc 2018-11-27 01:21:29 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:3650 https://access.redhat.com/errata/RHSA-2018:3650

Comment 8 Cedric Buissart 2018-11-28 15:50:30 UTC

Mitigation:

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