Title       : Security Vulnerability in xlock on VVOS, HP-UX 10.24
Date        : 971105
Type        : SB
Document ID : HPSBUX9711-073



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         HEWLETT-PACKARD SECURITY BULLETIN: #00073, 4 November 1997
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The information in the following Security Bulletin should be acted upon
as soon as possible.  Hewlett-Packard 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:  Vulnerabilities exist in xlock on VirtualVault 2.0/3.0 if patch
          PHSS_9905 is installed.

PLATFORM: HP9000 Series 700/800s running:
          HP-UX 10.24 (VVOS) with VirtualVault A.02.00 with patch PHSS_9905.
          HP-UX 10.24 (VVOS) with VirtualVault A.03.00 with Extensions
          Software (this includes PHSS_9905)

DAMAGE:   The xlock vulnerability could result in allowing a local user
          to gain unauthorized access to the system.

SOLUTION:  Apply PHSS_12961 to correct the vulnerability.

AVAILABILITY: The patch is available now.
____________________________________________________________________

I.
   A. Background
      The xlock program allows a user to "lock" an X terminal while
      maintaining their login session.  A vulnerability exists in xlock
      that could allow a local user to attain unauthorized access to the
      system.

   B. Fixing the problem
      This problem can be eliminated by applying the recommended patch.

   C. Recommended solution
      Hewlett-Packard recommends that the PHSS_12961 patch be applied if
      PHSS_9905 has already been installed.  The PHSS_9905 patch is
      included in the Software Extension Media provided with VirtualVault
      A.03.00.

        NOTE:
        These problems only apply to systems running the VirtualVault
        Operating System 10.24 that is part of the VirtualVault product
        A.02.00 and A.03.00.

   D. Impact of the patch
      Applying PHSS_12961 eliminates the vulnerability in the xlock
      program but does not otherwise impact the system.

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