Bug 1619756 (CVE-2018-15908)

Summary:	CVE-2018-15908 ghostscript: .tempfile file permission issues (699657)
Product:	[Other] Security Response	Reporter:	Stefan Cornelius <scorneli>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	abhgupta, ahardin, bleanhar, ccoleman, dbaker, dedgar, jgoulding, jokerman, mchappel, mosvald, sthangav, trankin, twaugh, yozone, 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 .tempfile function did not properly handle file permissions. An attacker could possibly exploit this to exploit this to bypass the -dSAFER protection and delete files or disclose their content via a specially crafted PostScript document.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-11-28 15:41:15 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:	1621159, 1621162, 1621164, 1654367
Bug Blocks:	1619570

Description Stefan Cornelius 2018-08-21 16:19:21 UTC

It was discovered that the ghostscript .tempfile function did not properly handle file permissions. A specially crafted PostScript document could possibly exploit this to bypass the -dSAFER protection and delete files or disclose their content.

Comment 1 Stefan Cornelius 2018-08-21 16:26:02 UTC

External References:

http://seclists.org/oss-sec/2018/q3/142

Comment 2 Stefan Cornelius 2018-08-22 10:19:49 UTC

Mitigation:

Please see https://bugzilla.redhat.com/show_bug.cgi?id=1619748#c3

Comment 5 Stefan Cornelius 2018-08-23 14:26:06 UTC

Patch:
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=0d3901189f

Comment 6 Stefan Cornelius 2018-08-23 15:36:34 UTC

Acknowledgments:

Name: Tavis Ormandy (Google Project Zero)

Comment 10 errata-xmlrpc 2018-11-27 01:21:04 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 11 Cedric Buissart 2018-11-28 15:40:20 UTC

Created ghostscript tracking bugs for this issue:

Affects: fedora-all [bug 1654367]