Bug 1625832 (CVE-2018-15911)

Summary:	CVE-2018-15911 ghostscript: Uninitialized memory access in the aesdecode operator (699665)
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:	rskvaril, 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 ghostscript did not properly verify the key used in aesdecode. 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:	2018-12-18 09:11:47 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:	1625833, 1625834, 1651149, 1651150
Bug Blocks:	1619570

Description Sam Fowler 2018-09-06 05:09:34 UTC

In Artifex Ghostscript 9.23 before 2018-08-24, attackers able to supply crafted PostScript could use uninitialized memory access in the aesdecode operator to crash the interpreter or potentially execute code.


External Reference:

https://www.kb.cert.org/vuls/id/332928


Upstream Bug:

https://bugs.ghostscript.com/show_bug.cgi?id=699665


Upstream Patch:

http://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=8e9ce501

Comment 1 Sam Fowler 2018-09-06 05:10:01 UTC

Created ghostscript tracking bugs for this issue:

Affects: fedora-all [bug 1625833]

Comment 4 Stefan Cornelius 2018-09-19 14:59:48 UTC

Statement:

This issue did affect 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 6 Cedric Buissart 2018-11-20 10:35:18 UTC

Mitigation:

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

Comment 9 errata-xmlrpc 2018-12-17 19:58:17 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