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AA-2008.0120                  AUSCERT Advisory

                             [Win][UNIX/Linux]
      new versions of stunnel released correcting two vulnerabilities
                                27 May 2008
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        AusCERT Advisory Summary
        ------------------------

Product:              stunnel versions prior to 4.24
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Windows
Impact:               Increased Privileges
                      Inappropriate Access
Access:               Remote/Unauthenticated
                      Existing Account
Member content until: Tuesday, June 24 2008

OVERVIEW:
        
        New versions of stunnel have been released to correct 
        vulnerabilities.


IMPACT: 

        According to the stunnel-announce mailing list [1][2]:

        "Local privilege escalation bug on Windows NT based systems fixed.
         A local user could exploit stunnel running as a service to gain 
         localsystem privileges." (CVE-2008-2400)

        "The bug allows a revoked certificate to successfully authenticate. 
         Any installations with OCSP enabled should be upgraded ASAP. 
         Other users are not affected." (CVE-2008-2420)


MITIGATION:

        The vulnerability identified by CVE-2008-2400 has been corrected in 
        version 4.23. The vulnerability identified by CVE-2008-2420 has been
        corrected in version 4.24 of stunnel. Users of stunnel are advised to
        upgrade to the latest version of stunnel (4.24).


REFERENCES:

        [1] stunnel 4.23 released
            http://stunnel.mirt.net/pipermail/stunnel-announce/2008-May/000034.html

        [2] stunnel 4.24 released
            http://stunnel.mirt.net/pipermail/stunnel-announce/2008-May/000035.html

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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