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Date: Thu, 17 May 2007 06:53:45 -0700
Subject: [security bulletin] HPSBTU02209 SSRT071323 rev.1 - HP Tru64 UNIX Running Secure Shell (SSH), Remote Unauthorized Identification of Valid Users

Hash: SHA1


Document ID: c01007552
Version: 1

HPSBTU02209 SSRT071323 rev.1 - HP Tru64 UNIX Running Secure Shell (SSH), Remote Unauthorized Identification of Valid Users

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

Release Date: 2007-05-09
Last Updated: 2007-05-09

Potential Security Impact: Remote, unauthorized identification of valid Users

Source: Hewlett-Packard Company, HP Software Security Response Team

A potential security vulnerability has been identified with HP Tru64 UNIX running Secure Shell (SSH). 
The vulnerability could be exploited remotely by an unauthorized user to identify valid users. 

References: NONE

SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed.
The following supported software versions are affected: 

HP Tru64 UNIX v5.1B-4 
HP Tru64 UNIX v5.1B-3 

For a PGP signed version of this security bulletin please write to: 

The Hewlett-Packard Company thanks Andrea Purificato for reporting this vulnerability to

Until updates are available in mainstream release patch kits, HP is releasing the following Early Release Patch (ERP) kits publicly for use by any customer. 

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

The resolutions contained in the ERP kits are targeted for availability in the following mainstream patch kit: 

HP Tru64 UNIX Version v5.1B-5

Special Instructions for the Customer: 

This patch adds a new keyword to the sshd2_config configuration file for the sshd2 daemon. The new keyword, AuthInteractiveFailureRandomTimeout , adds a random delay to the existing AuthInteractiveFailureTimeout delay. See the sshd2_config man page for information on AuthInteractiveFailureTimeout. 

The AuthInteractiveFailureRandomTimeout keyword can take a value from 0 to 100 (in seconds). The default is 2. To disable AuthInteractiveFailureRandomTimeout, specify a value of 0. When a non-zero value is specified for this keyword, a random number of milliseconds up to the number of seconds specified multiplied by 1000 is added to the server delay specified by AuthInteractiveFailureTimeout.

HP Tru64 UNIX Version v5.1B-4 
Prerequisite: HP Tru64 UNIX v5.1B-4 PK6 (BL27) 
Kit Name: T64KIT1001208-V51BB26-ES-20070427 
Kit Location: 
HP Tru64 UNIX Version v5.1B-3 
Prerequisite: HP Tru64 UNIX v5.1B-3 PK5 (BL26) 
Kit Name: T64KIT1001205-V51BB27-ES-20070427 
Kit Location: 

MD5 checksums are available from the ITRC patch database main page.



Version:1 (rev.1) - 9 May 2007 Initial release 

Third Party Security Patches: Third party security patches which are to be installed on systems running HP software products should be applied in accordance with the customer's patch management policy. 

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: 
It is strongly recommended that security related information being communicated to HP be encrypted using PGP, especially exploit information. 
To get the security-alert PGP key, please send an e-mail message as follows:
  Subject: get key

Subscribe: To initiate a subscription to receive future HP Security Bulletins via Email: 
On the web page: ITRC security bulletins and patch sign-up 
Under Step1: your ITRC security bulletins and patches 
  - check ALL categories for which alerts are required and continue.
Under Step2: your ITRC operating systems 
  - verify your operating system selections are checked and save.

To update an existing subscription: 
Log in on the web page: Subscriber's choice for Business: sign-in. 
On the web page: Subscriber's Choice: your profile summary - use Edit Profile to update appropriate sections.

To review previously published Security Bulletins visit: 

* The Software Product Category that this Security Bulletin relates to is represented by the 5th and 6th characters of the Bulletin number in the title: 

GN = HP General SW
MA = HP Management Agents
MI = Misc. 3rd Party SW
NS = HP NonStop Servers
PI = HP Printing & Imaging
ST = HP Storage SW
TL = HP Trusted Linux
TU = HP Tru64 UNIX
VV = HP VirtualVault

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."

ęCopyright 2007 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 or 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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