Sec. Vulnerability in xlock on VVOS, HP-UX 10.24

Sec. Vulnerability in xlock on VVOS, HP-UX 10.24

Post by Security Ale » Thu, 06 Nov 1997 04:00:00



Please direct any follow-ups to comp.sys.hp.hpux.

-------------------------------------------------------------------------
         HEWLETT-PACKARD SECURITY BULLETIN: #00073, 4 November 1997
-------------------------------------------------------------------------

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.

-------------------------------------------------------------------------
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.

   E. To subscribe to automatically receive future NEW HP Security
      Bulletins from the HP Electronic Support Center via electronic mail,
      do the following:

      Use your browser to get to the HP Electronic Support Center page at:

   http://us-support.external.hp.com
   (for US, Canada, Asia-Pacific, & Latin-America)

   http://europe-support.external.hp.com
   (for Europe)

   Click on the Technical Knowledge Database, register as a user
   (remember to save the User ID assigned to you, and your password),
   and it will connect to a HP Search Technical Knowledge DB page.
   Near the bottom is a hyperlink to our Security Bulletin archive.
   Once in the archive there is another link to our current
   security patch matrix. Updated daily, this matrix is categorized
   by platform/OS release, and by bulletin topic.

   F. 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

     Permission is granted for copying and circulating this Bulletin to
     Hewlett-Packard (HP) customers (or the Internet community) for the
     purpose of alerting them to problems, if and only if, the Bulletin 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.
________________________________________________________________________