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SECURITY BULLETIN: (SSRT-541) Tru64 UNIX CDE, NFS and NIS related
                              Potential Security Vulnerabilities

Posted at: http://ftp.support.compaq.com/patches/.new/security.shtml

NOTICE: There are no restrictions for distribution of this Bulletin
provided that it remains complete and intact.

RELEASE DATE:  APRIL, 2002

SEVERITY:  See individual sections of PROBLEM SUMMARY

SOURCE:  Compaq Computer Corporation
                 Compaq Services
                 Software Security Response Team

PROBLEM SUMMARY:

 A number of potential security vulnerabilities have recently been
 reported for CDE, libc, and NFS released with Tru64 UNIX V4.0F,
 V4.0G, V5.0A, V5.1 and V5.1A, where under certain circumstances,
 system integrity may be compromised by a malicious user.

  - CDE (severity high)

     o dtaction potential buffer overflow  (SSRT0752U)
     o ttsession potential buffer overflow (SSRT0753U)
     o dtprintinfo potential buffer overflow (SSRT0757U, SSRT0788U)
     o dtspcd potential buffer overflow.  (SSRT0782U)
       x-ref: (CVE CVE-2001-0803, CERT CA-2001-31, CA-2002-01)
         Compaq has not been able to reproduce the problem identified
         in the CERT advisory for any Compaq OS. However with the
         information available, we are including a code change for
         dtspcd that will further reduce any potential buffer
overflow
         vulnerability. 
             Buffer overflow attacks are commonly used to attempt to
             subvert the function of a privileged program and
             possibly execute commands at the elevated privileges if
             the program file has the set uid privilege.


  - Environment Variable LANG and LOCPATH  (severity high)

    o libc  (SSRT0771U)  
          A libc environment variable corruption with LANG and
          LOCPATH , may cause a potential buffer overflow

  - NIS   Network Information Service (severity moderate)

    o ypbind may core during nmap portscan  (SSRT0781U)
            Core: A file that is a copy of the contents of a
            processes memory, that can be produced when that
            process is aborted by certain kinds of internal error.


  - NFS Network File System (severity moderate) (V4.0g pk3/BL17 &
                                                 V5.0a pk3/BL17 only)

    o NFS Potential packet flood denial of service (DoS) (SSRT1-26)
         A remote user with malicious intent may cause a potential
         denial of service (DoS) with portmap server.
            Network DoS attacks make computer systems inaccessible by
            flooding a service, server or network with useless
            traffic.


VERSIONS IMPACTED:

    TRU64 UNIX V5.1a PK1(BL1),
                      V5.1  PK4(BL18),
                      V5.0a PK3(BL17),
                      V4.0g PK3(BL17),
                      V4.0f PK7(BL18).

RESOLUTION:

 The potential vulnerabilities noted below have been corrected and
 patches are now available for TRU64 UNIX.

 Compaq strongly recommends that systems be updated to at least the
 prerequisite version of TRU64 UNIX and PK release and then install
 the previously released security patches identified in the security
 advisory bulletin
 http://ftp.support.compaq.com/patches/.new/html/SSRT0742U-59U.shtml
 prior to installing these Early Release Patches.

 Early Release Patches (ERPs) are available for all supported
 versions of Tru64 UNIX and will be available in the next aggregate
 patch kits for each supported product version.  Until these
 Tru64 UNIX fixes are generally available in mainstream patch kits,
 Compaq recommends use of the following Early Release Patches (ERP)
kits:


 Tru64 UNIX 5.1A:
 Prerequisite: 5.1A with Patch Kit 1 (BL1) installed
 ERP Kit Name: T64V51AB1-C0011201-13438-ES-20020228.tar
 Kit Location: <http://ftp1.support.compaq.com/public/unix/v5.1a/>


 Tru64 UNIX 5.1:
 Prerequisite: 5.1 with Patch Kit 4 (BL18) installed
 ERP Kit Name: T64V51B18-C0102001-13428-ES-20020228.tar
 Kit Location: <http://ftp1.support.compaq.com/public/unix/v5.1/>


 Tru64 UNIX 5.0A:
 Prerequisite: 5.0A with Patch Kit 3 (BL17) installed
 ERP Kit Name: T64V50AB17-C0018301-13396-ES-20020226.tar
 Kit Location: <http://ftp1.support.compaq.com/public/unix/v5.0a/>

 Tru64 UNIX 4.0G:
 Prerequisite: 4.0G with Patch Kit 3 (BL17) installed
 ERP Kit Name: T64V40GB17-C0010301-13400-ES-20020226.tar
 Kit Location: <http://ftp1.support.compaq.com/public/unix/v4.0g/>

 Tru64 UNIX 4.0F:
 Prerequisite: 4.0F with Patch Kit 7 (BL18) installed
 ERP Kit Name: DUV40FB18-C0067301-13427-ES-20020228.tar
 Kit Location: <http://ftp1.support.compaq.com/public/unix/v4.0f/>


 MD5 and SHA1 checksums are available in the public patch notice for
 the ERP kits. You may find information on how to verify MD5 and SHA1
 checksums at:
 http://www.support.compaq.com/patches/whats-new.shtml

  NOTE: (1)  Please review the README file(s) for each patch prior
  to installation.

 After completing the update, Compaq strongly recommends that
 you perform an immediate backup of your system disk so that
 any subsequent restore operations begin with updated software.
 Otherwise, you must reapply the update after a future restore
 operation. Also, if at some future time, you upgrade your system
 to a later patch release or version release, you may need to
 re-apply the appropriate ERP identified below.


SUPPORT:

 For further information, contact your normal Compaq Support channel.


SUBSCRIBE:

 To subscribe to automatically receive future Security
 Advisories from the Compaq's Software Security Response Team via
 electronic mail:
  http://www.support.compaq.com/patches/mailing-list.shtml

REPORT:

 To report a potential security vulnerability with any Compaq
 supported product, send email mailto:security-ssrt@compaq.com
 or  mailto:sec-alert@compaq.com

 Compaq appreciates your cooperation and patience. As always,
 Compaq urges you to periodically review your system management
 and security procedures. Compaq will continue to review and
 enhance the security features of its products and work with
 our customers to maintain and improve the security and integrity
 of their systems.

 "Compaq is broadly distributing this Security Bulletin in order to
 bring to the attention of users of the affected Compaq products the
 important security information contained in this Bulletin.
 Compaq recommends that all users determine the applicability of
 this information to their individual situations and take appropriate
 action.  Compaq does not warrant that this information is 
 necessarily accurate or complete for all user situations and,
 consequently, Compaq will not be responsible for any damages
 resulting from user's use or disregard of the information provided
 in this Bulletin."

 Copyright 2002 Compaq Information Technologies Group, L.P.
 Compaq shall not be liable for technical or editorial errors
 or omissions contained herein. The information in this document
 is subject to change without notice. Compaq and the names of
 Compaq products referenced herein are, either, trademarks
 and/or service marks or registered trademarks and/or service
 marks of Compaq Information Technologies Group, L.P. Other product
 and company names mentioned herein may be trademarks and/or service
 marks of their respective owners.

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