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TUCoPS :: HP/UX :: ciach022.txt

HP Update Talkd Buffer Overrun




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             __________________________________________________________

                       The U.S. Department of Energy
                    Computer Incident Advisory Capability
                           ___  __ __    _     ___
                          /       |     /_\   /
                          \___  __|__  /   \  \___
             __________________________________________________________

                             INFORMATION BULLETIN

                       talkd Buffer Overrun Vulnerability
                        Update to talkd in Bulletin H-22

May 1, 1997 19:00 GMT                                             Number H-22a
______________________________________________________________________________
PROBLEM:       A vulnerability has been identified in the talkd communication
               program.
PLATFORM:      Hewlett-Packard
DAMAGE:        Local users may gain root privileges.
SOLUTION:      Apply patches as indicated below.
______________________________________________________________________________
VULNERABILITY  Exploit details involving this vulnerability have been made
ASSESSMENT:    publicly available.
______________________________________________________________________________

This bulletin updates H-22 by adding patch information from Hewlett-Packard.
The previous bulletin contains information about BSDI products.

[ Start Hewlett-Packard Advisory ]

Document ID:  HPSBUX9704-061
Date Loaded:  970501
      Title:  Security Vulnerability in talkd for HP-UX 10.X only

- -------------------------------------------------------------------------
     HEWLETT-PACKARD SECURITY BULLETIN: #00061, 30 April 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:  Security Vulnerability in talkd

PLATFORM: HP 9000 Series 700/800s running only HP-UX 10.X releases.

DAMAGE:   Vulnerabilities exist allowing network users to gain root
          privileges.

SOLUTION: Apply patch:
          PHNE_10042 for all platforms with HP-UX releases 10.0X/10.10
          PHNE_10043 for all platforms with HP-UX release 10.20

AVAILABILITY: All patches are available now.
- -------------------------------------------------------------------------
I.
   A. Background
      As referenced in CERT(sm) Advisory CA-97.04 on January 27, 1997
      a vulnerability in the talkd executable has been discovered.
      The program talkd started shipping in HP-UX 10.X releases.

   B. Fixing the problem
      The vulnerability can be eliminated from HP-UX release 10.X
      by applying the appropriate patch.

   C. Recommended solution
      1. Determine which patch is appropriate for your operating
         system.

      2. Hewlett-Packard's HP-UX patches are available via email
         and the World Wide Web

         To obtain a copy of the Hewlett-Packard SupportLine email
         service user's guide, send the following in the TEXT PORTION
         OF THE MESSAGE to support@us.external.hp.com (no Subject
         is required):
                              send guide

         The users guide explains the HP-UX patch downloading process
         via email and other services available.

         World Wide Web service for downloading of patches
         is available via our URL:
                  (http://us.external.hp.com)

      3. Apply the patch to your HP-UX system.

      4. Examine /var/adm/sw/swinstall.log, for any relevant WARNING's
         or ERROR's.

   D. Impact of the patch
      The patches for HP-UX release 10.X provide enhancements to the
      talkd executable to avoid this vulnerability.

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

      User 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

           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
      message with a -subject- (not body) of 'get key' (no quotes) to
      security-alert@hp.com.

      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.

[ End Hewlett-Packard Advisory ]
______________________________________________________________________________

CIAC wishes to acknowledge the contributions of Hewlett-Packard for the
information contained in this bulletin.
______________________________________________________________________________


CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
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This document was prepared as an account of work sponsored by an
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