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             AUSCERT External Security Bulletin Redistribution

                        ESB-2009.0110 -- [Solaris]
   Security Vulnerability in OpenSSL due to Improper Usage of Signature
                               17 April 2009

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

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

Product:              Solaris 10 Operating System
                      OpenSolaris
Publisher:            Sun Microsystems
Operating System:     Solaris
Impact:               Provide Misleading Information
Access:               Remote/Unauthenticated
CVE Names:            CVE-2008-5077

Ref:                  ESB-2009.0038

Original Bulletin:    
  http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-250826-1

Revision History:     April 17 2009: Patches released
                      February 20 2009: Workaround added
                      February 2 2009: Signed with new key
                      February  2 2009: Initial Release

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   Solution Type: Sun Alert
   Solution  250826 :   Security Vulnerability in OpenSSL due to Improper
   Usage of Signature          
   Bug ID: 6786120

   Product
   Solaris 10 Operating System
   OpenSolaris

   Date of Preliminary Release: 29-Jan-2009

   Date of Workaround Release: 18-Feb-2009

   Date of Resolved Release: 16-Mar-2009

   SA Document Body
   Security vulnerability in OpenSSL due to improper usage of signature 
   verification:

   1. Impact
   An insufficient validation security vulnerability in OpenSSL may allow
   a malformed signature to be treated as a good signature rather than as
   an error. This issue affects the signature checks on DSA keys used
   with SSL/TLS. This vulnerability may allow a remote user who is in
   control of a rogue server or who can use a "man-in-the-middle attack"
   to masquerade as a valid, legitimate server using malformed SSL
   certificates.
   Sun acknowledges with thanks, Google Security Team for bringing this
   issue to our attention.
   This issue is also referenced in the following document:
     * CVE-2008-5077
       http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5077

   2. Contributing Factors
   This issue can occur in the following releases:
   SPARC Platform
     * Solaris 10 without patch 139500-03
     * OpenSolaris based upon builds snv_01 through snv_106

   x86 Platform
     * Solaris 10 without patch 139501-02
     * OpenSolaris based upon builds snv_01 through snv_106

   Note 1: Solaris 8 is not impacted by this issue.
   Note 2:  Solaris 9 does not ship with OpenSSL libraries which can be
   used for third-party application usage. WANboot in Solaris 9 which
   contains libssl, is only capable of using RSA certificates and hence
   not affected.
   Note 3: OpenSolaris distributions may include additional bug fixes
   above and beyond the build from which it was derived.  To determine
   the base build of OpenSolaris, the following command can be used:
    $ uname -v
     snv_86

   Note 4: Only OpenSolaris installations including the affected binary
   "/usr/sfw/bin/openssl" or "/usr/lib/libssl.so" are impacted by this
   issue.
   Note 5: Use of OpenSSL as an SSL/TLS client when connecting to a
   server whose certificate contains a RSA key is not affected.
   Verification of client certificates by OpenSSL servers for *any* key
   type is not affected.
   Note 6: To determine  if a server certificate contains a DSA key,
   inspect the "Subject Public Key Info" section. This can be done using
   the command:
    $ openssl x509 -in server-certificate.pem -text
    ...
    Subject Public Key Info:
    Public Key Algorithm: dsaEncryption
    DSA Public Key:
    ...

   3. Symptoms
   There are no predictable symptoms that would indicate the described
   issue has occurred.
   
   4. Workaround
   There is no workaround for this issue. Please see the Resolution
   section below.
   
   5. Resolution
   This issue is addressed in the following releases:
   SPARC Platform
     * Solaris 10 with patch 139500-03 or later
     * OpenSolaris based upon builds snv_107 or later

   x86 Platform
     * Solaris 10 with patch 139501-02 or later
     * OpenSolaris based upon builds snv_107 or later

   For more information on Security Sun Alerts, see Technical
   Instruction ID 213557.

   This Sun Alert notification is being provided to you on an "AS IS"
   basis. This Sun Alert notification may contain information provided by
   third parties. The issues described in this Sun Alert notification may
   or may not impact your system(s). Sun makes no representations,
   warranties, or guarantees as to the information contained herein. ANY
   AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
   WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
   NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT
   YOU ACKNOWLEDGE THAT SUN SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT,
   INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE
   OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN.
   This Sun Alert notification contains Sun proprietary and confidential
   information. It is being provided to you pursuant to the provisions of
   your agreement to purchase services from Sun, or, if you do not have
   such an agreement, the Sun.com Terms of Use. This Sun Alert
   notification may only be used for the purposes contemplated by these
   agreements. 
   Copyright 2000-2009 Sun Microsystems, Inc., 4150 Network Circle, Santa
   Clara, CA 95054 U.S.A. All rights reserved

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