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                         AUSCERT Security Bulletin

                               ASB-2010.0085
               Vulnerability discovered in Novell eDirectory
                               19 March 2010

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              Novell eDirectory
Operating System:     Windows
                      Netware
                      Linux variants
                      Solaris
                      AIX
Impact/Access:        Administrator Compromise -- Remote/Unauthenticated
Resolution:           Mitigation
Member content until: Sunday, April 18 2010

OVERVIEW

        A security vulnerability has been reported in Novell eDirectory that
        can allow attackers to take over administrator sessions.


IMPACT

        The following details were reported by the discoverer of this 
        vulnerability:
        
        "Novell eDirectory DHOST Predictable Session Cookie
        
        This module is able to predict the next session cookie value issued 
        by the DHOST web service of Novell eDirectory 8.8.5. An attacker 
        can run this module, wait until the real administrator logs in, then 
        specify the predicted cookie value to hijack their session." [1]
        
        This was detailed in a metasploit module indicating that the 
        exploit code is now public.


MITIGATION

        At the time of this publication there was no patch available from 
        Novell. Until one becomes available, administrators may wish to 
        restrict network access to the server and monitor it for signs 
        of compromise. Access to administrative functions should always
        be restricted to trusted networks and not be publically available.


REFERENCES

        [1] Novell eDirectory DHOST Predictable Session Cookie
            http://www.metasploit.com/modules/auxiliary/admin/edirectory/edirectory_dhost_cookie

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

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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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