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                         AUSCERT Security Bulletin

                              ASB-2009.1125.2
                          OpenSSL 0.9.8l Released
                              9 November 2009

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

Product:              OpenSSL
Operating System:     Windows
                      UNIX variants (UNIX, Linux, OSX)
Impact/Access:        Unauthorised Access            -- Remote/Unauthenticated
                      Provide Misleading Information -- Remote/Unauthenticated
Resolution:           Mitigation
CVE Names:            CVE-2009-3555  
Member content until: Wednesday, December  9 2009

Comment: This release from OpenSSL disables the vulnerable phase and as such
         would cause configurations that depend on renegotiation to fail.
         Be sure to test before deploying this mitigation to live systems.

Revision History:     November 9 2009: Corrected resolution, added comment
                      November 9 2009: Initial Release

OVERVIEW

        A vulnerability has been identified in OpenSSL where a Man in the 
        Middle attack could be exploited during the renegotiation phase. 
        A new version of OpenSSL has been released to mitigate this
        vulnerability


IMPACT

        The release notes of the latest version (0.9.8l) [1] detail the
        following fix:
        
           Disable renegotiation completely - this fixes a severe security
           problem (CVE-2009-3555) at the cost of breaking all
           renegotiation. Renegotiation can be re-enabled by setting
           SSL3_FLAGS_ALLOW_UNSAFE_LEGACY_RENEGOTIATION in s3->flags at
           run-time. This is really not recommended unless you know what
           you're doing.
        
        This release is the result of what is now a public vulnerability in
        the renegotiating phase of OpenSSL [2]


MITIGATION

        Users can download version 0.9.8l from the vendor's website. [3]


REFERENCES

        [1] OpenSSL 0.9.8l
            http://www.openssl.org/source/openssl-0.9.8l.tar.gz

        [2] Renegotiating TLS
            http://extendedsubset.com/?p=8

        [3] OpenSSL: Source, Tarballs
            http://www.openssl.org/source/

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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