K-014: HP-UX Aserver Vulnerability

PROBLEM:       A vulnerability has been identified in Aserver.
PLATFORM:      HP9000 Series 7/800 running HP-UX releases 10.X and 11.X.
DAMAGE:        An exploit to gain Root access has been made publicly
               available.
SOLUTION:      Implement procedure specified within HP bulletin.
VULNERABILITY  The risk is HIGH since root access can be acquired.
ASSESSMENT:


[  Start HP-UX Advisory  ]

Document ID:  HPSBUX0001-108
Date Loaded:  20000105
      Title:  Security Vulnerability in Aserver (revised)


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**REVISED 01** HEWLETT-PACKARD COMPANY SECURITY ADVISORY: #00108, 01 Jan 2000
Last Revised: 17 March, 2000
-------------------------------------------------------------------------


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.


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PROBLEM:  /opt/audio/bin/Aserver can be used to gain root access.


PLATFORM: HP9000 Series 7/800 running HP-UX releases 10.X and 11.X


DAMAGE:   Root access is possible.


SOLUTION: **REVISED 02** Change the Aserver permissions.


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


CHANGE SUMMARY: This revision contains revised permission recommendations.
-------------------------------------------------------------------------
I.
   A. Background
      A procedure to use /opt/audio/bin/Aserver to gain root access
      has been made public.


   B. Recommended solution
**REVISED 01**  | The need for suid permissions is being reviewed.
                | The only requirement for suid currently identified
                | is to allow any user to force a restart of the Aserver.
                | This feature may be eventually be removed.  Until a
                | patch is available the recommended solution, as root
                | is:
                |  chmod 555 /opt/audio/bin/Aserver
**REVISED 02** || Until a patch is available that fixes the problem
               || installing an Aserver patch will restore the original
               || permissions.  It is safer to set the 555 permissions
               || each time the system is started.  One way to do that
               || is to create /sbin/rc2.d/S769audio with 555 permissions
               || containing the following script:
               ||
               ||#!/sbin/sh
               ||
               ||PATH=/sbin:/usr/sbin:/usr/bin
               ||export PATH
               ||
               ||case $1 in
               ||start_msg)
               ||       echo "chmod 555 /opt/audio/bin/Aserver"
               ||       ;;
               ||
               ||'start')
               ||       chmod 555 /opt/audio/bin/Aserver
               ||       ;;
               ||
               ||*)
               ||       echo "usage: $0 start"
               ||       ;;
               ||esac
               ||
               ||exit 0


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      ~ftp/export/patches/hp-ux_patch_matrix



    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
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       security-alert@hp.com.

      Permission is granted for copying and circulating this advisory to
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      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:  HPSBUX0001-108--------------------------------------


[  End HP-UX Advisory  ]

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