Bug 1621363 – CVE-2018-16542 ghostscript: .definemodifiedfont memory corruption if /typecheck is handled (699668)

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Bug 1621363 - (CVE-2018-16542) CVE-2018-16542 ghostscript: .definemodifiedfont memory corruption if /typecheck is handled (699668)

Summary:	CVE-2018-16542 ghostscript: .definemodifiedfont memory corruption if /typeche...

Status:	NEW

Aliases:	CVE-2018-16542

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	high Severity high
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=important,public=20180906,repo...
Keywords:	Security

Depends On:	1625828 1621380 1621382 1625827
Blocks:	1619570
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Reported:	2018-08-23 11:24 EDT by Stefan Cornelius
Modified:	2018-10-31 21:32 EDT (History)
CC List:	3 users (show)

See Also:
Fixed In Version:
Doc Type:	If docs needed, set a value
Doc Text:	It was discovered that ghostscript did not properly handle certain stack overflow error conditions. 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.
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oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2018:2918	None	None	None	2018-10-15 22:25 EDT

Groups: None (edit)

Description Stefan Cornelius 2018-08-23 11:24:15 EDT

It was discovered that ghostscript did not properly handle certain stack overflow error conditions. A specially crafted PostScript document could exploit this to crash ghostscript or, possibly, execute arbitrary code in the context of the ghostscript process.

Patch:
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=b575e1ec42

Comment 3 Sam Fowler 2018-09-06 00:44:57 EDT

Created ghostscript tracking bugs for this issue:

Affects: fedora-all [bug 1625827]

Comment 5 Stefan Cornelius 2018-09-19 04:22:51 EDT

Statement:

This issue affects the versions of ghostscript as shipped with Red Hat Enterprise Linux 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 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 6 Stefan Cornelius 2018-09-19 04:23:20 EDT

Acknowledgments:

Name: Tavis Ormandy (Google Project Zero)

Comment 7 errata-xmlrpc 2018-10-15 22:25:35 EDT

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:2918 https://access.redhat.com/errata/RHSA-2018:2918

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