AUSCERT External Security Bulletin Redistribution
                    ESB-98.067 -- Digital Advisory SSRT0452U
                 Vulnerability in FTP (bounce) for Digital UNIX
                                 8th May 1998


Digital Equipment Corporation has released the following advisory
concerning a vulnerability in ftpd (FTP bounce) for Digital UNIX software.
This vulnerability may allow users to gain unauthorized privileges.

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.

NOTE: This is only the original release of the security bulletin.  It will
not be updated when the original bulletin is.  If downloading at a later
date, it is recommended that the bulletin is retrieved from the original
authors to ensure that the information is still current.

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

Previous advisories and external security bulletins can be retrieved from:


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

Internet Email: auscert@auscert.org.au
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.
Facsimile:      (07) 3365 7031

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UPDATE:                                         APR  30,  1998

  TITLE: DIGITAL UNIX  ftpd  V3.2g, V4.0, V4.0a, V4.0b, V4.0c
         - Potential Security Vulnerability
	ref#: SSRT0452U   ftpd (ftp bounce)
  SOURCE: Digital Equipment Corporation
          Software Security Response Team 

 "Digital is broadly distributing this Security Advisory in order
 to bring to the attention of users of Digital's products the
 important security information contained in this Advisory. 
 Digital recommends that all users determine the applicability of
 this information to their individual situations and take
 appropriate action.

 Digital does not warrant that this information is necessarily
 accurate or complete for all user situations and, consequently,
 Digital will not be responsible for any damages resulting from
 user's use or disregard of the information provided in this

- ----------------------------------------------------------------------
  Digital has discovered a potential vulnerability with the 
  FTP (bounce) for DIGITAL UNIX  software, where under certain 
  circumstances, an user may gain unauthorized privileges. 

  Digital strongly recommends upgrading to a minimum of
  Digital UNIX V4.0b accordingly, and that the appropriate
  patch kit be installed immediately.
- ----------------------------------------------------------------------

 This potential security problem has been resolved and an official
 patch for this problem has been made available as an early release
 kit for DIGITAL UNIX V4.0a (duv40ass0000600041100-19980317.*)
 and, included in the latest DIGITAL UNIX V4.0b aggregate DUPATCH Kit. 
	 The V3.2g aggregate BL 10 patch kit #5 
	 is scheduled for release in late June 1998.
	 The V4.0 aggregate  BL 9 patch kit #6 
	 is scheduled for release mid May 1998.
	 The V4.0c aggregate BL10 patch kit #6 
	 is scheduled for release mid May 1998.

 *This potential problem was included in the distributed release of 

  o the World Wide Web at the following FTP address:

    Use the FTP access option, select DIGITAL_UNIX directory
    then choose the appropriate version directory 
    and download the patch accordingly.

  Note: [1]The appropriate patch kit must be installed
  	following any upgrade to V4.0a, V4.0b, or V4.0c.
        [2] Please review the appropriate release notes
        prior to installation.
 If you need further information, please contact your normal DIGITAL
 support channel.

 DIGITAL appreciates your cooperation and patience. We regret any
 inconvenience applying this information may cause.

 As always, Digital urges you to periodically review your system
 management and security procedures. 

  Digital will continue to review and enhance the security
  features of its products and work with customers to maintain and
  improve the security and integrity of their systems.

  Copyright (c) Digital Equipment Corporation, 1998 All
  Rights Reserved.
  Unpublished Rights Reserved Under The Copyright Laws Of
  The United States.

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Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key