Bug 1096601 (CVE-2014-0211)

Summary:	CVE-2014-0211 libXfont: integer overflows calculating memory needs for xfs replies
Product:	[Other] Security Response	Reporter:	Huzaifa S. Sidhpurwala <huzaifas>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	carnil, chazlett, jkurik, jrusnack, kem, security-response-team
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	libXfont 1.4.8, libXfont 1.4.99.901 (1.5.0rc1)	Doc Type:	Bug Fix
Doc Text:	Multiple out-of-bounds write flaws were found in the way libXfont parsed replies received from an X.org font server. A malicious X.org server could cause an X client to crash or, possibly, execute arbitrary code with the privileges of the X.Org server.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-11-25 07:47:09 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:	1097397, 1163601, 1163602, 1163603, 1163604, 1165521
Bug Blocks:	1096603

Description Huzaifa S. Sidhpurwala 2014-05-12 06:40:14 UTC

When parsing replies received from the font server, these calls do not check that their calculations for how much memory is needed to handle the returned data have not overflowed, so can result in allocating too little memory and then writing the returned data past the end of the allocated buffer.

Affected functions: fs_get_reply(), fs_alloc_glyphs(),
fs_read_extent_info()


Acknowledgements:

Red Hat would like to thank the X.org project for reporting this issue. Upstream acknowledges Ilja van Sprundel as the original reporter of this issue.

Comment 1 Vincent Danen 2014-05-13 17:40:46 UTC

Upstream commits:

http://cgit.freedesktop.org/xorg/lib/libXfont/commit/?id=a42f707f8a62973f5e8bbcd08afb10a79e9cee33
http://cgit.freedesktop.org/xorg/lib/libXfont/commit/?id=c578408c1fd4db09e4e3173f8a9e65c81cc187c1
http://cgit.freedesktop.org/xorg/lib/libXfont/commit/?id=0f1a5d372c143f91a602bdf10c917d7eabaee09b


External Reference:

http://lists.x.org/archives/xorg-announce/2014-May/002431.html

Comment 2 Vincent Danen 2014-05-13 17:44:52 UTC

Created libXfont tracking bugs for this issue:

Affects: fedora-all [bug 1097397]

Comment 3 Vincent Danen 2014-05-27 18:11:46 UTC

Statement:

(none)

Comment 4 Fedora Update System 2014-07-16 02:01:10 UTC

libXfont-1.4.8-1.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 5 Fedora Update System 2014-07-23 03:01:32 UTC

libXfont-1.4.8-1.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 8 errata-xmlrpc 2014-11-18 11:42:15 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6
  Red Hat Enterprise Linux 7

Via RHSA-2014:1870 https://rhn.redhat.com/errata/RHSA-2014-1870.html

Comment 10 Martin Prpič 2014-11-19 08:18:19 UTC

IssueDescription:

Multiple out-of-bounds write flaws were found in the way libXfont parsed replies received from an X.org font server. A malicious X.org server could cause an X client to crash or, possibly, execute arbitrary code with the privileges of the X.Org server.

Comment 11 errata-xmlrpc 2014-11-24 20:57:50 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 5

Via RHSA-2014:1893 https://rhn.redhat.com/errata/RHSA-2014-1893.html