AUSCERT External Security Bulletin Redistribution

              ESB-2002.321 -- HP-UX security bulletins digest
          HPSBUX0206-195 - Sec. Vulnerability in OpenSSH on HP-UX
                                1 July 2002


        AusCERT Security Bulletin Summary

Operating System:       HP-UX release 11.00 with T1471AA SSH 
                        HP-UX release 11.11 with T1471AA SSH 
Platform:               HP 9000 Servers
Impact:                 Execute Arbitrary Code/Commands
Access Required:        Remote

Ref:                    AL-2002.05

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Document ID:  HPSBUX0206-195
Date Loaded:  20020626
      Title:  Sec. Vulnerability in OpenSSH on HP-UX

   Originally issued: 27 June 2002 

The information in the following Security Advisory 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 Advisory as
soon as possible.

PROBLEM:  OpenSSH input validation errors can cause faults from
          remote hosts in SSH protocol version 2.

PLATFORM: HP 9000 Servers running HP-UX release 11.00, and 11.11
          only with the T1471AA SSH product installed.

DAMAGE:   Possible privilege increases, from remote locations.

SOLUTION: Disable PAMAuthenticationViaKbdInt in sshd_config.

MANUAL ACTIONS: Edit sshd_config appropriately.


A. Background
    Pursuant to the CERT Advisory CA-2002-18 on OpenSSH,
    Hewlett-Packard Company has learned of a defect in the
    code in SSH, product number T1471AA.

B. Fixing the problem
   As a short-term solution, disable PAMAuthenticationViaKbdInt
   in the sshd_config file; i.e.,

       PAMAuthenticationViaKbdInt no

   The CERT advisory mentions adding the following line to 
        ChallengeResponseAuthentication no
   ChallengeResponseAuthentication is not used in the HP product.

   HP is working to produce a patch for its version which is based
   on OpenSSH release 3.1p1.  This advisory will be updated to a
   bulletin when that patch is released.

C. To subscribe to automatically receive future NEW HP Security
   Bulletins from the HP IT Resource Center via electronic
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   Use your browser to get to the HP IT Resource Center page at:


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    For information on the Security Patch Check tool, see:

    The security patch matrix is also available via anonymous


    On the "Support Information Digest Main" page:
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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)
   of 'get key' (no quotes) to security-alert@hp.com.

   Permission is granted for copying and circulating this
   Advisory to Hewlett-Packard (HP) customers (or the Internet
   community) for the purpose of alerting them to problems,
   if and only if, the Advisory is not edited or changed in
   any way, is attributed to HP, and provided such reproduction
   and/or distribution is performed for non-commercial purposes.

   Any other use of this information is prohibited. HP is not
   liable for any misuse of this information by any third party.

- -----End of Document ID:  HPSBUX0206-195--------------------------------------

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