AUSCERT External Security Bulletin Redistribution

           ESB-97.057 -- Hewlett-Packard Security Bulletin #00061
                               2 May 1997


Hewlett-Packard has released the following security bulletin concerning
a vulnerability in talkd program. This vulnerability may allow remote
users to gain root privileges.

This bulletin addresses the vulnerability previously described in
AUSCERT Advisory AA-97.01 -- talkd Buffer Overrun Vulnerability.

The following security bulletin is provided as a service to AUSCERT's
members. As AUSCERT did not write this document, AUSCERT has had no control
over its content.  As such, the decision to use any or all of this
information is the responsibility of each user or organisation, and should
be done so in accordance with site policies and procedures.

Contact information for Hewlett-Packard is included in the Security
Bulletin below.  If you have any questions or need further information,
please contact them directly.

If you believe that your system has been compromised, contact AUSCERT or
your representative in FIRST (Forum of Incident Response and Security Teams).

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 4477
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
	AUSCERT personnel answer during Queensland business hours
	which are GMT+10:00 (AEST).
	On call after hours for emergencies.

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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:  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

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.
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   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

      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:

      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

      (for US, Canada, Asia-Pacific, & Latin-America)

      (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.
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