[gentoo-announce] [ GLSA 200806-07 ] X.Org X server: Multiple vulnerabilities

[news 28]

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Gentoo Linux Security Advisory GLSA 200806-07

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http://security.gentoo.org/

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Severity: High

Title: X.Org X server: Multiple vulnerabilities

Date: June 19, 2008

Bugs: #225419

ID: 200806-07

 

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Synopsis

========

 

Multiple vulnerabilities have been discovered in the X.Org X server,

possibly allowing for the remote execution of arbitrary code with root

privileges.

 

Background

==========

 

The X Window System is a graphical windowing system based on a

client/server model.

 

Affected packages

=================

 

-------------------------------------------------------------------

Package / Vulnerable / Unaffected

-------------------------------------------------------------------

1 x11-base/xorg-server < 1.3.0.0-r6 >= 1.3.0.0-r6

 

Description

===========

 

Regenrecht reported multiple vulnerabilities in various X server

extensions via iDefense:

 

* The SProcSecurityGenerateAuthorization() and

SProcRecordCreateContext() functions of the RECORD and Security

extensions are lacking proper parameter validation (CVE-2008-1377).

 

* An integer overflow is possible in the function ShmPutImage() of

the MIT-SHM extension (CVE-2008-1379).

 

* The RENDER extension contains several possible integer overflows in

the AllocateGlyph() function (CVE-2008-2360) which could possibly

lead to a heap-based buffer overflow. Further possible integer

overflows have been found in the ProcRenderCreateCursor() function

(CVE-2008-2361) as well as in the SProcRenderCreateLinearGradient(),

SProcRenderCreateRadialGradient() and

SProcRenderCreateConicalGradient() functions (CVE-2008-2362).

 

Impact

======

 

Exploitation of these vulnerabilities could possibly lead to the remote

execution of arbitrary code with root privileges, if the server is

running as root, which is the default. It is also possible to crash the

server by making use of these vulnerabilities.

 

Workaround

==========

 

It is possible to avoid these vulnerabilities by disabling the affected

server extensions. Therefore edit the configuration file

(/etc/X11/xorg.conf) to contain the following in the appropriate

places:

 

Section "Extensions"

Option "MIT-SHM" "disable"

Option "RENDER" "disable"

Option "SECURITY" "disable"

EndSection

 

Section "Module"

Disable "record"

EndSection

 

Resolution

==========

 

All X.org X Server users should upgrade to the latest version:

 

# emerge --sync

# emerge --ask --oneshot --verbose ">=x11-base/xorg-server-1.3.0.0-r6"

 

References

==========

 

[ 1 ] CVE-2008-1377

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1377

[ 2 ] CVE-2008-1379

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1379

[ 3 ] CVE-2008-2360

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2360

[ 4 ] CVE-2008-2361

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2361

[ 5 ] CVE-2008-2362

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2362

 

Availability

============

 

This GLSA and any updates to it are available for viewing at

the Gentoo Security Website:

 

http://security.gentoo.org/glsa/glsa-200806-07.xml

 

Concerns?

=========

 

Security is a primary focus of Gentoo Linux and ensuring the

confidentiality and security of our users machines is of utmost

importance to us. Any security concerns should be addressed to

security ( -at -) gentoo.org or alternatively, you may file a bug at

http://bugs.gentoo.org.

 

License

=======

 

Copyright 2008 Gentoo Foundation, Inc; referenced text

belongs to its owner(s).

 

The contents of this document are licensed under the

Creative Commons - Attribution / Share Alike license.

 

http://creativecommons.org/licenses/by-sa/2.5