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AA-2009.0095                  AUSCERT Advisory

                               [UNIX/Linux]
                         pam_ssh: Reduced Security
                               16 April 2009
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        AusCERT Advisory Summary
        ------------------------

Product:              pam_ssh
Operating System:     UNIX variants (UNIX, Linux, OSX)
Impact:               Reduced Security
Access:               Remote/Unauthenticated
CVE Names:            CVE-2009-1273
Member content until: Thursday, May 14 2009

OVERVIEW:

       A vulnerability has been corrected in pam_ssh.


IMPACT:

       The vendor has provided the following details regarding this 
       vulnerability:

       "SECURITY FIX: pam_ssh used a certain prompt if a user found to 
       exist to ask for the SSH passphrase explicitely depending on 
       whether the username was valid or invalid, which made it easier 
       for remote attackers to enumerate usernames.(CVE-2009-1273)." [1]


MITIGATION:

       Users can download pam_ssh version 1.97 from the vendor's website.
       [2]


REFERENCES:

       [1] pam_ssh 1.97 has been released
           http://sourceforge.net/forum/forum.php?forum_id=941046

       [2] SourceForge.net: pam_ssh: Files
           http://sourceforge.net/project/showfiles.php?group_id=16000

AusCERT has made every effort to ensure that the information contained
in this document is accurate.  However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

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