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AA-2009.0066                  AUSCERT Advisory

                             [Win][UNIX/Linux]
                     OpenSSL: Multiple vulnerabilities
                               27 March 2009
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        AusCERT Advisory Summary
        ------------------------

Product:              OpenSSL
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Windows
Impact:               Increased Privileges
                      Provide Misleading Information
                      Denial of Service
Access:               Remote/Unauthenticated
CVE Names:            CVE-2009-0590 CVE-2009-0591 CVE-2009-0789
Member content until: Friday, April 24 2009

OVERVIEW:

      A number of vulnerabilities have been identified in OpenSSL which may
      allow an attacker to bypass security restrictions and cause a denial 
      of service.


IMPACT:

      CVE-2009-0590:

      A crash could result due to an issue with the ASN1_STRING_print_ex() 
      function when printing BMPString or UniversalString, as a result of 
      access to invalid memory. [1]

      CVE-2009-0591:

      Error conditions with malformed attributes are not properly signed
      by the CMS_verify() function, allowing an invalid signature to appear
      valid. This affects OpenSSL 0.9.8h and later when CMS in enabled. [1]

      CVE-2009-0789:

      An invalid memory access due to the processing of malformed ASN1 
      structures, could cause a crash. This only affects versions prior to 
      version 0.9.8k and certain platforms where 
      'sizeof(long)'<'sizeof(void*)'. [1]
      

MITIGATION:

       It is recommended to update to OpenSSL version 0.9.8k. [2]


REFERENCES:

      [1] OpenSSL Security Advisory [25-Mar-2009]
          http://www.openssl.org/news/secadv_20090325.txt

      [2] 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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