Bug 1382305 (CVE-2016-7979)

Summary:	CVE-2016-7979 ghostscript: Type confusion in .initialize_dsc_parser allows remote code execution
Product:	[Other] Security Response	Reporter:	Cedric Buissart <cbuissar>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	abhgupta, deekej, dmcphers, jialiu, jokerman, kseifried, lmeyer, mmccomas, slawomir, tiwillia, twaugh, zdohnal
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	It was found that the ghostscript function .initialize_dsc_parser did not validate its parameter before using it, allowing a type confusion flaw. A specially crafted postscript document could cause a crash code execution in the context of the gs process.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-01-04 11:10:58 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Bug Depends On:	Engineering1390299, Engineering1390300, Engineering1390301, Engineering1390302, 1390489
Bug Blocks:	Embargoed1380329

Description Cedric Buissart 2016-10-06 09:52:08 UTC

.initialize_dsc_parser doesn't validate the parameter is a dict type before using it.

This is a security issue, because it can be abused to escape the -dSAFER sandbox.

This allows a Denial of Service, arbitrary code execution.

Upstream bug :
 - Bug 697190 - .initialize_dsc_parser doesn't validate the parameter is a dict type before using it.
http://bugs.ghostscript.com/show_bug.cgi?id=697190

Upstream patch :
 - DSC parser - validate parameters
http://git.ghostscript.com/?p=ghostpdl.git;h=875a0095f37626a721c7ff57d606a0f95af03913

Reference :
http://seclists.org/oss-sec/2016/q4/37

Comment 7 Cedric Buissart 2016-11-01 08:43:06 UTC

Created ghostscript tracking bugs for this issue:

Affects: fedora-all [bug 1390489]

Comment 9 errata-xmlrpc 2017-01-04 10:10:30 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2017:0014 https://rhn.redhat.com/errata/RHSA-2017-0014.html

Comment 10 errata-xmlrpc 2017-01-04 10:11:49 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:0013 https://rhn.redhat.com/errata/RHSA-2017-0013.html