Hash: SHA1

             AUSCERT External Security Bulletin Redistribution

             ESB-2005.0630 -- HP Security Bulletin HPSBTU01217
        SSRT5957 rev.0 - HP Tru64 UNIX IPSEC Tunnel ESP Mode Remote
                 Unauthorized Disclosure of Encrypted Data
                              11 August 2005


        AusCERT Security Bulletin Summary

Product:           IPSEC
Publisher:         Hewlett-Packard
Operating System:  HP Tru64 UNIX
Impact:            Access Confidential Data
Access:            Remote/Unauthenticated
CVE Names:         CAN-2005-0039

Ref:               ESB-2005.0374

- --------------------------BEGIN INCLUDED TEXT--------------------

Hash: SHA1



SSRT5957 rev.0 - HP Tru64 UNIX IPSEC Tunnel ESP Mode Remote
                 Unauthorized Disclosure of Encrypted Data

The information in this Security Bulletin should be acted upon
as soon as possible.

09 August 2005

remote unauthorized disclosure of encrypted data

Hewlett-Packard Company
HP Software Security Response Team

Several potential security vulnerabilities have been reported on
HP Tru64 UNIX systems using an IPsec tunnel mode configuration
which uses ESP without authentication.  When running this
configuration a remote attacker could force an error such that a
portion of a plain-text message can be intercepted by the


NISCC VU#004033 CAN-2005-0039
SUPPORTED SOFTWARE VERSIONS*:  ONLY impacted versions are listed.
HP Tru64 UNIX 5.1B-3
HP Tru64 UNIX 5.1B-2/PK4


- - From the NISCC Vulnerability report VU#4033:

A vulnerability affecting IPsec was identified by the Information
Security Group (ISG) at Royal Holloway, University of London. The
ISG outlines three attacks that applies to a special case of the
usage of IPsec; this is where IPsec is configured to provide
confidentiality only with no integrity protection in tunnel mode.
Under this setup, an attacker can modify sections of the IPsec
packet and hence cause the endpoint to generate an error on
receipt of such modified packets. These errors are relay back to
the sending host via the Internet Control Message Protocol (ICMP);
because of the design of ICMP, these messages directly reveal
segments of the header and payload of the IPsec packet in
cleartext. An attacker can then intercept the ICMP messages to
retrieve the data in plaintext.

For Further details see the NISCC web site at www.unirad.co.uk


Until the correction is available in  a mainstream release patch
kit, HP is releasing the following Early Release Patch (ERP) kits.

The ERP kits use dupatch and will not install over any installed
Customer Specific Patches (CSPs) that have file intersections with
this ERP.  Please contact your service provider for assistance if
the ERP installation is blocked by any of your installed CSPs.

The fixes contained in the ERP kits are scheduled to be available
in the following mainstream patch kit:


Early Release Patches

The ERP delivers the following files:


Note:  After installing this ERP, customers should run
       "/usr/sbin/sysman ipsec". If there are any unsafe IPsec
       connections, a warning message will be displayed.

HP Tru64 UNIX 5.1B-3
ERP Kit Name:          T64KIT0026133-V51BB25-ES-20050801
General ITRC Patch Page:
Kit Location:
MD5 checksum:

HP Tru64 UNIX  5.1B-2/PK4
ERP Kit Name:          T64KIT0026161-V51BB26-ES-20050804
General ITRC Patch Page:
Kit Location:
MD5 checksum:

MD5 checksum:

4 August 2005
  Initial release

SUPPORT: For further information, contact normal HP Services
support channel.

REPORT: To report a potential security vulnerability with any HP
supported product, send Email to: security-alert@hp.com. It is
strongly recommended that security related information being
communicated to HP be encrypted using PGP, especially exploit
information. To obtain the security-alert PGP key please send an
e-mail message to security-alert@hp.com with the Subject of
'get key' (no quotes).

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* The Software Product Category that this Security Bulletin
  relates to is represented by the 5th and 6th characters of the
  Bulletin number:
    GN = HP General SW,
    MA = HP Management Agents,
    MI = Misc. 3rd party SW,
    MP = HP MPE/iX,
    NS = HP NonStop Servers,
    OV = HP OpenVMS,
    PI = HP Printing & Imaging,
    ST = HP Storage SW,
    TL = HP Trusted Linux,
    TU = HP Tru64 UNIX,
    UX = HP-UX,
    VV = HP Virtual Vault

System management and security procedures must be reviewed
frequently to maintain system integrity. HP is continually
reviewing and enhancing the security features of software products
to provide customers with current secure solutions.

"HP is broadly distributing this Security Bulletin in order to
bring to the attention of users of the affected HP products the
important security information contained in this Bulletin. HP
recommends that all users determine the applicability of this
information to their individual situations and take appropriate
action. HP does not warrant that this information is necessarily
accurate or complete for all user situations and, consequently, HP
will not be responsible for any damages resulting from user's use
or disregard of the information provided in this Bulletin. To the
extent permitted by law, HP disclaims all warranties, either
express or implied, including the warranties of merchantability
and fitness for a particular purpose, title and non-infringement."

(c)Copyright 2005 Hewlett-Packard Development Company, L.P.
Hewlett-Packard Company shall not be liable for technical or
editorial errors or omissions contained herein. The information
provided is provided "as is" without warranty of any kind. To the
extent permitted by law, neither HP nor its affiliates,
subcontractors or suppliers will be liable for incidental, special
or consequential damages including downtime cost; lost profits;
damages relating to the procurement of substitute products or
services; or damages for loss of data, or software restoration.
The information in this document is subject to change without
notice. Hewlett-Packard Company and the names of Hewlett-Packard
products referenced herein are trademarks of Hewlett-Packard
Company in the United States and other countries. Other product
and company names mentioned herein may be trademarks of their
respective owners.

Version: PGP 8.1


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