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             AUSCERT External Security Bulletin Redistribution

     ESB-2002.674 -- HEWLETT-PACKARD SECURITY BULLETIN: HPSBUX0212-228
                  SSRT2429 Security Vulnerability in xfs
                             05 December 2002

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:                xfs (X Font Server)
Vendor:                 Hewlett-Packard
Operating System:       HP-UX 10.10
                        HP-UX 10.20
                        HP-UX 10.24
                        HP-UX 11.00
                        HP-UX 11.04
                        HP-UX 11.11
                        HP-UX 11.22
Platform:               HP9000
Impact:                 Execute Arbitrary Code/Commands
                        Denial of Service
Access Required:        Remote

Ref:                    ESB-2002.662

- --------------------------BEGIN INCLUDED TEXT--------------------

Document ID:  HPSBUX0212-228
Date Loaded:  20021203
      Title:  SSRT2429 Security Vulnerability in xfs

 -----------------------------------------------------------------
 Source: HEWLETT-PACKARD COMPANY
 SECURITY BULLETIN: HPSBUX0212-228
 Originally issued: 4 December 2002
 SSRT2429 Security Vulnerability in xfs
 -----------------------------------------------------------------
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

SOLUTION: Until patches are available manually install the 
          appropriate fixed version of xfs.

MANUAL ACTIONS: Yes - NonUpdate
                Install the appropriate fixed xfs.

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

 ------------------------------------------------------------------ 
 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
    Until patches are released download and manually install
    the appropriate fixed version of xfs: 

       10.10  xfs.1010
       10.20  xfs.1020
       10.24  xfs.1020
       11.00  xfs.1100
       11.04  xfs.1100
       11.11  xfs.1111
       11.22  xfs.1111
       
       
    Download the appropriate files from:

     System:    hprc.external.hp.com  (192.170.19.51)
     Login:     xfs
     Password:  xfs1

     FTP Access: ftp://xfs:xfs1@hprc.external.hp.com/
             or: ftp://xfs:xfs1@192.170.19.51/


      Note: There is an ftp defect in IE5 that may result in
            a browser hang.  To work around this:
      - Select Tools -> Internet Options -> Advanced
      - Un-check the option: [ ] Enable folder view for FTP sites.


     The files are:

        xfs.1010
        xfs.1020
        xfs.1100
        xfs.1111


    The cksum output:


        4146829079 147456 xfs.1010
        2943686322 155648 xfs.1020
        1843422197 163840 xfs.1100
        3420832763 176128 xfs.1111

    The md5 output:

        MD5 (xfs.1010) = ac33c55d5242aadd48fb7485bacea12b
        MD5 (xfs.1020) = 8ca2515aeaf6a6838291bc96ad5b41b2
        MD5 (xfs.1100) = 159c5547d0efd51d12e79c7a35c514c4
        MD5 (xfs.1111) = e0896eab16747df27d7c2262041a66c0

    Note: The md5 source is available in HPSBUX9408-016.


    Set "umask 022" and copy the appropriate files to a
    secure directory, for example /.  
    Then:

    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.1010 /usr/bin/X11/xfs   # for 10.10
        or
      cp /xfs.1020 /usr/bin/X11/xfs   # for 10.20 and 10.24
        or
      cp /xfs.1100 /usr/bin/X11/xfs   # for 11.00 and 11.04
        or
      cp /xfs.1111 /usr/bin/X11/xfs   # for 11.11 and 11.22

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

      /sbin/rc2.d/S620xfs start

 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
    "Register" button at the left to create a login, in order to
    gain access to many areas of the ITRC.  Remember to save the
    User ID assigned to you, and your password.

    In the left most frame select "Maintenance and Support".

    Under the "Notifications" section (near the bottom of
    the page), select "Support Information Digests".

    To -subscribe- to future HP Security Bulletins or other
    Technical Digests, click the check box (in the left column)
    for the appropriate digest and then click the "Update
    Subscriptions" button at the bottom of the page.

    or

    To -review- bulletins already released, select the link
    (in the middle column) for the appropriate digest.

    To -gain access- to the Security Patch Matrix, select
    the link for "The Security Bulletins Archive".  (near the
    bottom of the page)  Once in the archive the third link is
    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

    security-alert@hp.com

    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)
    of 'get key' (no quotes) to security-alert@hp.com.

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

(c)Copyright 2002 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.

 ________________________________________________________________
- -----End of Document ID:  HPSBUX0212-228--------------------------------------

- --------------------------END INCLUDED TEXT--------------------

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