Bug 1191085 – CVE-2014-9663 freetype: out-of-bounds read in tt_cmap4_validate()

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Bug 1191085 - (CVE-2014-9663) CVE-2014-9663 freetype: out-of-bounds read in tt_cmap4_validate()

Summary:	CVE-2014-9663 freetype: out-of-bounds read in tt_cmap4_validate()

Status:	CLOSED ERRATA

Aliases:	CVE-2014-9663

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

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

URL:
Whiteboard:	impact=low,public=20141124,reported=2...
Keywords:	Security

Depends On:	1191099 1197737 1197738 1197739 1197740
Blocks:	1191102
	Show dependency tree / graph

Reported:	2015-02-10 07:51 EST by Vasyl Kaigorodov
Modified:	2015-11-25 05:28 EST (History)
CC List:	4 users (show)

See Also:
Fixed In Version:	freetype 2.5.4
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2015-03-18 03:40:50 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2015:0696	normal	SHIPPED_LIVE	Important: freetype security update	2015-03-17 17:58:07 EDT

Groups: None (edit)

Description Vasyl Kaigorodov 2015-02-10 07:51:08 EST

Common Vulnerabilities and Exposures assigned CVE-2014-9663 to the following issue:

The tt_cmap4_validate function in sfnt/ttcmap.c in FreeType before 2.5.4
validates a certain length field before that field's value is completely
calculated, which allows remote attackers to cause a denial of service
(out-of-bounds read) or possibly have unspecified other impact via a crafted
cmap SFNT table.

http://code.google.com/p/google-security-research/issues/detail?id=184
http://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=9bd20b7304aae61de5d50ac359cf27132bafd4c1

Comment 1 Vasyl Kaigorodov 2015-02-10 07:56:30 EST

Created freetype tracking bugs for this issue:

Affects: fedora-all [bug 1191099]

Comment 2 Fedora Update System 2015-02-19 13:00:53 EST

freetype-2.5.3-15.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 3 Fedora Update System 2015-02-20 03:30:49 EST

freetype-2.5.0-9.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 4 Tomas Hoger 2015-02-20 16:57:41 EST

Upstream bug is:
https://savannah.nongnu.org/bugs/?43656

Issue was fixed upstream in 2.5.4.

This is a very limited buffer over-read.  Two bytes are read from at max 7th and 8th byte after the end of the buffer.  After that, another check is reached that detects the problem.  This is rather unlikely to cause crash.

Issue is caused by a misplaced check to ensure enough input it still available for further parsing.  After the check, length variable indicating remaining input size is decremented to the size of the actually available data.

Comment 7 errata-xmlrpc 2015-03-17 13:59:01 EDT

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6
  Red Hat Enterprise Linux 7

Via RHSA-2015:0696 https://rhn.redhat.com/errata/RHSA-2015-0696.html

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