SSRT2429 Potential Security Vulnerability in xfs (rev.2)

SSRT2429 Potential Security Vulnerability in xfs (rev.2)

Post by Security Ale » Fri, 21 Feb 2003 02:27:19



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 ** REVISED 02**
 Source: HEWLETT-PACKARD COMPANY
 SECURITY BULLETIN: HPSBUX0212-228
 Originally issued: 4 December 2002
 Last revised: 19 February 2003
 SSRT2429 Potential Security Vulnerability in xfs
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NOTICE: There are no restrictions for distribution of this Bulletin
provided that it remains complete and intact.

The information in the following Security Bulletin should be
acted upon as soon as possible.  Hewlett-Packard Company will
not be liable for any consequences to any customer resulting
from customer's failure to fully implement instructions in this
Security Bulletin as soon as possible.

 ------------------------------------------------------------------
PROBLEM: Potential buffer overflow in the X Font Server (xfs)

IMPACT: Potential unauthorized access, denial of service.

PLATFORM: HP 9000 Series 700 and 800 running HP-UX 10.10, 10.20,
          10.24, 11.00, 11.04, 11.11, and 11.22

**REVISED 02**
SOLUTION: Install the appropriate patch:
- -->>          10.20 PHSS_28468
- -->>          10.24 extract xfs from the 10.20 patch
- -->>          11.00 PHSS_28469
- -->>          11.04 extract xfs from the 11.00 patch
- -->>          11.11 PHSS_28470
- -->>          11.22 PHSS_28471

MANUAL ACTIONS: Yes - NonUpdate
- -->>                10.24 extract xfs from the 10.20 patch
- -->>                11.04 extract xfs from the 11.00 patch
- -->>                10.20, 11.00, 11.11, 11.22 - no manual
- -->>                actions needed.

AVAILABILITY:  This bulletin will be updated when patches are
               available.

CHANGE SUMMARY: Rev.01 - corrected versions available
                Rev.02 - patches available for 10.20, 11.00, 11.11,
                         and 11.22.
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 A. Background
    CERT Advisory CA-2002-34 reports an remotely exploitable
    buffer overflow in the X Font Server (xfs).  The versions
    of xfs supplied with HP-UX 10.10, 10.20, 10.24, 11.00, 11.04,
    11.11, and 11.22 are potentially vulnerable.

 B. Recommended solution

** REVISED 02**
- -->>    Install the appropriate patch:
- -->>          10.20 PHSS_28468
- -->>          10.24 extract xfs from the 10.20 patch
- -->>          11.00 PHSS_28469
- -->>          11.04 extract xfs from the 11.00 patch
- -->>          11.11 PHSS_28470
- -->>          11.22 PHSS_28471

- -->> For 10.24 and 11.04 only:

- -->>   Extract the xfs file from the 10.20 or 11.00 patch.

- -->>     sh PHSS_28468
- -->>     tar -xvf PHSS_28468.depot
- -->>     cp PHSS_28468/PHSS_28468/usr/bin/X11/xfs xfs.1020

- -->>     sh PHSS_28469
- -->>     tar -xvf PHSS_28469.depot
- -->>     cp PHSS_28469/X11-FONTSRV/usr/bin/X11/xfs xfs.1100

    1. Save the original xfs.

       cp /usr/bin/X11/xfs /usr/bin/X11/xfs.orig

    2. Determine if xfs is running:

       ps -ef | grep xfs

    3. Stop xfs if it is running.

      /sbin/rc2.d/S620xfs stop

    4. Install the appropriate fixed xfs.

      cp xfs.1020 /usr/bin/X11/xfs   # for 10.24
        or
      cp xfs.1100 /usr/bin/X11/xfs   # for 11.04

    5. If xfs had been stopped in step 3, restart it.

      /sbin/rc2.d/S620xfs start

**REVISED 02**
- -->>    Customers with HP-UX version 10.10 should write

 C. To subscribe to automatically receive future NEW HP Security
    Bulletins from the HP IT Resource Center via electronic
    mail, do the following:

    Use your browser to get to the HP IT Resource Center page
    at:

       http://itrc.hp.com

    Use the 'Login' tab at the left side of the screen to login
    using your ID and password.  Use your existing login or the
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    In the left most frame select "Maintenance and Support".

    Under the "Notifications" section (near the bottom of
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    To -subscribe- to future HP Security Bulletins or other
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    for the appropriate digest and then click the "Update
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    or

    To -review- bulletins already released, select the link
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    To -gain access- to the Security Patch Matrix, select
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    to the current Security Patch Matrix. Updated daily, this
    matrix categorizes security patches by platform/OS release,
    and by bulletin topic.  Security Patch Check completely
    automates the process of reviewing the patch matrix for
    11.XX systems.

    For information on the Security Patch Check tool, see:
    http://www.software.hp.com/cgi-bin/swdepot_parser.cgi/cgi/
    displayProductInfo.pl?productNumber=B6834AA

    The security patch matrix is also available via anonymous
    ftp:

    ftp://ftp.itrc.hp.com/export/patches/hp-ux_patch_matrix/

    On the "Support Information Digest Main" page:
    click on the "HP Security Bulletin Archive".

 D. To report new security vulnerabilities, send email to


    Please encrypt any exploit information using the
    security-alert PGP key, available from your local key
    server, or by sending a message with a -subject- (not body)

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(c)Copyright 2003 Hewlett-Packard Company
Hewlett-Packard Company shall not be liable for technical or
editorial errors or omissions contained herein. The information
in this document is subject to change without notice.
Hewlett-Packard Company and the names of HP products referenced
herein are trademarks and/or service marks of Hewlett-Packard
Company.  Other product and company names mentioned herein may be
trademarks and/or service marks of their respective owners.

 ________________________________________________________________

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Yours truly,
HP S/W Security Team
WTEC Cupertino, California