AusCERT - ASB-2009.1143 - [OpenBSD] OpenSSL: Unauthorised access

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ASB-2009.1143 - [OpenBSD] OpenSSL: Unauthorised access - Remote/unauthenticated

Date: 26 November 2009
References: ASB-2009.1125.2 ESB-2010.0274 ASB-2010.0168 ESB-2012.0682 ESB-2012.1005

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                         AUSCERT Security Bulletin

                               ASB-2009.1143
                       OpenBSD OpenSSL vulnerability
                             27 November 2009

===========================================================================

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

Product:              OpenSSL
Operating System:     OpenBSD
Impact/Access:        Unauthorised Access            -- Remote/Unauthenticated
                      Provide Misleading Information -- Remote/Unauthenticated
Resolution:           Mitigation
CVE Names:            CVE-2009-3555  
Member content until: Sunday, December 27 2009
Reference:            ASB-2009.1125

OVERVIEW

        OpenBSD have released patches to mitigate a vulnerability in the 
        SSL/TLS protocol.


IMPACT

        The vendor has provided the following information regarding this
        vulnerability:
        
        "The SSL/TLS protocol is subject to man-in-the-middle attacks 
        related to renegotiation (see CVE-2009-3555, 
        draft-ietf-tls-renegotiation-00). OpenSSL permitted this protocol 
        feature by default and had no way to disable it."  [1,2]


MITIGATION

        Patches have been released for OpenBSD 4.5 [3] and 4.6 [4] to
        mitigate this vulnerability. 


REFERENCES

        [1] OpenBSD 4.5 errata
            http://www.openbsd.org/errata45.html

        [2] OpenBSD 4.6 errata
            http://www.openbsd.org/errata46.html

        [3] OpenBSD 4.5 010_openssl.patch
            ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.5/common/010_openssl.patch

        [4] OpenBSD 4.6 004_openssl.patch
            ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.6/common/004_openssl.patch

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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