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Category:   Application (Generic)  >   Xfs (X Font Server) Vendors:   X.org
(HP Issues Fix for HP-UX) X Font Server Overflows in QueryXBitmaps and QueryXExtents Requests Let Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1019192
SecurityTracker URL:  http://securitytracker.com/id/1019192
CVE Reference:   CVE-2007-4568, CVE-2007-4990   (Links to External Site)
Date:  Jan 15 2008
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): XFS 1.0.4 and prior versions
Description:   A vulnerability was reported in X.org's X Font Server. A remote user can execute arbitrary code on the target system.

A remote user can send specially crafted data to trigger a buffer overflow and execute arbitrary code on the target system. The code will run with the privileges of the target X Font Server.

Specially crafted QueryXBitmaps and QueryXExtents protocol requests can trigger an integer overflow.

Specially crafted QueryXBitmaps and QueryXExtents protocol requests can trigger a heap overflow.

On some systems, this vulnerability cannot be exploited remotely, depending on whether the X Font Server listens to a network port or not.

The vendor was notified on September 5, 2007.

Sean Larsson of VeriSign iDefense Labs discovered these vulnerabilities.

Impact:   A remote user can execute arbitrary code on the target system.
Solution:   HP has released the following patches, available at:

http://itrc.hp.com

HP-UX B.11.11
PHSS_37224 or subsequent

HP-UX B.11.23
PHSS_37225 or subsequent

HP-UX B.11.31
PHSS_37226 or subsequent

The HP advisory is available at:

http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c01323725

Vendor URL:  www.x.org/ (Links to External Site)
Cause:   Boundary error
Underlying OS:   UNIX (HP/UX)

Message History:   This archive entry is a follow-up to the message listed below.
Oct 3 2007 X Font Server Overflows in QueryXBitmaps and QueryXExtents Requests Let Remote Users Execute Arbitrary Code



 Source Message Contents

Date:  Tue, 15 Jan 2008 06:09:13 -0800
Subject:  [security bulletin] HPSBUX02303 SSRT071468 rev.1 - HP-UX Running X Font Server (xfs) Software, Remote Execution of Arbitrary


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

SUPPORT COMMUNICATION - SECURITY BULLETIN

Document ID: c01323725
Version: 1

HPSBUX02303 SSRT071468 rev.1 - HP-UX Running X Font Server (xfs) Software, Remote Execution of Arbitrary Code

NOTICE: The information in this Security Bulletin should be acted upon as soon as possible.

Release Date: 2008-01-14
Last Updated: 2008-01-14

Potential Security Impact: Remote execution of arbitrary code 

Source: Hewlett-Packard Company, HP Software Security Response Team

VULNERABILITY SUMMARY
A potential security vulnerability has been identified with HP-UX running the X Font Server (xfs). The vulnerability could be exploited
 remotely to execute arbitrary code.

References: CVE-2007-4990 

SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed.
HP-UX B.11.11, B.11.23, B.11.31 running the X Font Server (xfs). 

BACKGROUND
 
RESOLUTION
HP has provided the following software patches to resolve the vulnerability. 
The patches are available for download from: http://itrc.hp.com 

HP-UX B.11.11
 PHSS_37224 or subsequent
 
HP-UX B.11.23
 PHSS_37225 or subsequent
 
HP-UX B.11.31
 PHSS_37226 or subsequent
 

MANUAL ACTIONS: No 

PRODUCT SPECIFIC INFORMATION 

HP-UX Software Assistant: HP-UX Software Assistant is an enhanced application that replaces HP-UX Security Patch Check. It analyzes
 all Security Bulletins issued by HP and lists recommended actions that may apply to a specific HP-UX system. It can also download
 patches and create a depot automatically. For more information see: https://www.hp.com/go/swa 

The following text is for use by the HP-UX Software Assistant.

AFFECTED VERSIONS

HP-UX B.11.11 
============== 
X11.X11-FONTSRV 
action: install PHSS_37224 or subsequent 
URL: http://itrc.hp.com 

HP-UX B.11.23 
============== 
X11.X11-FONTSRV 
action: install PHSS_37225 or subsequent 
URL: http://itrc.hp.com 

HP-UX B.11.31 
============== 
X11.X11-FONTSRV 
action: install PHSS_37226 or subsequent 
URL: http://itrc.hp.com 

END AFFECTED VERSIONS

HISTORY 
Version 1 (rev.1) - 14 January 2008 Initial Release 

Third Party Security Patches: Third party security patches which are to be installed on systems running HP software products should
 be applied in accordance with the customer's patch management policy. 

Support: For further information, contact normal HP Services support channel.

Report: To report a potential security vulnerability with any HP supported product, send Email to: security-alert@hp.com 
It is strongly recommended that security related information being communicated to HP be encrypted using PGP, especially exploit information.
 
To get the security-alert PGP key, please send an e-mail message as follows:
  To: security-alert@hp.com 
  Subject: get key

Subscribe: To initiate a subscription to receive future HP Security Bulletins via Email: 
http://h30046.www3.hp.com/driverAlertProfile.php?regioncode=NA&langcode=USENG&jumpid=in_SC-GEN__driverITRC&topiccode=ITRC 
On the web page: ITRC security bulletins and patch sign-up 
Under Step1: your ITRC security bulletins and patches 
  - check ALL categories for which alerts are required and continue.
Under Step2: your ITRC operating systems 
  - verify your operating system selections are checked and save.


To update an existing subscription: http://h30046.www3.hp.com/subSignIn.php 
Log in on the web page: Subscriber's choice for Business: sign-in. 
On the web page: Subscriber's Choice: your profile summary - use Edit Profile to update appropriate sections.


To review previously published Security Bulletins visit: http://www.itrc.hp.com/service/cki/secBullArchive.do 


* The Software Product Category that this Security Bulletin relates to is represented by the 5th and 6th characters of the Bulletin
 number in the title: 

GN = HP General SW
MA = HP Management Agents
MI = Misc. 3rd Party SW
MP = HP MPE/iX
NS = HP NonStop Servers
OV = HP OpenVMS
PI = HP Printing & Imaging
ST = HP Storage SW
TL = HP Trusted Linux
TU = HP Tru64 UNIX
UX = HP-UX
VV = HP VirtualVault
 
System management and security procedures must be reviewed frequently to maintain system integrity. HP is continually reviewing and
 enhancing the security features of software products to provide customers with current secure solutions.


"HP is broadly distributing this Security Bulletin in order to bring to the attention of users of the affected HP products the important
 security information contained in this Bulletin. HP recommends that all users determine the applicability of this information to
 their individual situations and take appropriate action. HP does not warrant that this information is necessarily accurate or complete
 for all user situations and, consequently, HP will not be responsible for any damages resulting from user's use or disregard of the
 information provided in this Bulletin. To the extent permitted by law, HP disclaims all warranties, either express or implied, including
 the warranties of merchantability and fitness for a particular purpose, title and non-infringement."

©Copyright 2008 Hewlett-Packard Development Company, L.P. 

Hewlett-Packard Company shall not be liable for technical or editorial errors or omissions contained herein. The information provided
 is provided "as is" without warranty of any kind. To the extent permitted by law, neither HP or its affiliates, subcontractors or
 suppliers will be liable for incidental, special or consequential damages including downtime cost; lost profits; damages relating
 to the procurement of substitute products or services; or damages for loss of data, or software restoration. The information in this
 document is subject to change without notice. Hewlett-Packard Company and the names of Hewlett-Packard products referenced herein
 are trademarks of Hewlett-Packard Company in the United States and other countries. Other product and company names mentioned herein
 may be trademarks of their respective owners.
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