SSRT2429 Security Vulnerability in xfs (rev.1)

From: Security Alert (secure@cup.hp.com)
Date: 12/06/02 

From: secure@cup.hp.com (Security Alert)
Date: 6 Dec 2002 16:09:57 GMT

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 ** REVISED 01**
 Source: HEWLETT-PACKARD COMPANY
 SECURITY BULLETIN: HPSBUX0212-228
 Originally issued: 4 December 2002
 Last revised: 5 December 2002
 SSRT2429 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.

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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.

CHANGE SUMMARY: Rev.01 - corrected versions available
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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 01**
- -->> Note: The original files provided on the ftp site
- -->> had SHLIB_PATH enabled. Corrected versions are
- -->> now available. If you downloaded the original
- -->> versions you should either download the
- -->> corrected versions or disable SHLIB_PATH:
- -->> chatr +s disable xfs.1020
- -->> chatr +s disable xfs.1100
- -->> chatr +s disable xfs.1111

    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: xfs1@hprc.external.hp.com/">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

 ** REVISED 01**
    The cksum output:
      
        4146829079 147456 xfs.1010
- -->> 2627145351 155648 xfs.1020
- -->> 4285384907 163840 xfs.1100
- -->> 3498585750 176128 xfs.1111

 ** REVISED 01**
    The md5 output:

        MD5 (xfs.1010) = ac33c55d5242aadd48fb7485bacea12b
- -->> MD5 (xfs.1020) = 16545dd7320ae0d8455fb7d62ea90f2f
- -->> MD5 (xfs.1100) = de454e8cc89b3b1ea1426768dd94b1f3
- -->> MD5 (xfs.1111) = ecbcd1431e11b4dad2ca60a15a17dca6

    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
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    For information on the Security Patch Check tool, see:
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    displayProductInfo.pl?productNumber=B6834AA

    The security patch matrix is also available via anonymous
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    ftp://ftp.itrc.hp.com/export/patches/hp-ux_patch_matrix/

    On the "Support Information Digest Main" page:
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 D. To report new security vulnerabilities, send email to

    security-alert@hp.com

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(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.

 ________________________________________________________________

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