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AA-2009.0088                  AUSCERT Advisory

                                 [OpenBSD]
                        OpenSSL: Denial of Service
                               9 April 2009
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        AusCERT Advisory Summary
        ------------------------

Product:              OpenSSL
Operating System:     OpenBSD
Impact:               Denial of Service
Access:               Remote/Unauthenticated
CVE Names:            CVE-2009-0789 CVE-2009-0590
Member content until: Thursday, May 07 2009

Ref:                  AA-2009.0066
                      ESB-2009.0324

OVERVIEW:

      A number of vulnerabilities have been identified in OpenSSL running on 
      OpenBSD versions 4.3, 4.4 and 4.5.


IMPACT:

      The vendor provides the following description of these vulnerabilities:

      "The OpenSSL ASN.1 handling code could be forced to perform invalid 
      memory accesses though the use of certain invalid strings 
      (CVE-2009-0590) or under certain error conditions triggerable by 
      invalid ASN.1 structures (CVE-2009-0789). These vulnerabilities could 
      be exploited to achieve a denial-of-service. A more detailed 
      description of these problems is available in the OpenSSL security 
      advisory, but note that the other issue described there "Incorrect 
      Error Checking During CMS verification" relates to code not enabled in 
      OpenBSD." [1,2,3]


MITIGATION:

      The vendor has released patches to correct these vulnerabilities,
      which can be downloaded from:

      ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.5/common/001_openssl.patch
      ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.4/common/012_openssl.patch
      ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.3/common/012_openssl.patch


REFERENCES:

      [1] OpenBSD 4.3 errata
          http://openbsd.org/errata43.html#010_bgpd

      [2] OpenBSD 4.4 errata
          http://openbsd.org/errata44.html#010_bgpd

      [3] OpenBSD 4.5 errata
          http://openbsd.org/errata45.html#010_bgpd

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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