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A  U  S  C  E  R  T                                           A  L  E  R  T

                       AL-2008.0006 -- AUSCERT ALERT
                             [Win][UNIX/Linux]
                     Multiple Vulnerabilities in yaSSL
                              15 January 2008

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        AusCERT Alert Summary
        ---------------------

Product:              yaSSL
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Windows
Impact:               Denial of Service
                      Execute Arbitrary Code/Commands
Access:               Remote/Unauthenticated
CVE Names:            CVE-2008-0226 CVE-2008-0227
Member content until: Tuesday, February 12 2008

OVERVIEW:

        Multiple vulnerabilities have been reported in yaSSL, which is 
        commonly used in MySQL and other products, which can result in
        remote attackers executing arbitrary code or a Denial of Service
        (DoS).


IMPACT:

        The National Vulnerability Database [1], gives the following
        information regarding these vulnerabilities:

        o CVE-2008-0226: "Multiple buffer overflows in yaSSL 1.7.5 and 
          earlier, as used in MySQL and possibly other products, allow 
          remote attackers to execute arbitrary code via (1) the 
          ProcessOldClientHello function in handshake.cpp or (2) 
          "input_buffer& operator>>" in yassl_imp.cpp." [2]

        o CVE-2008-0227: "yaSSL 1.7.5 and earlier, as used in MySQL and 
          possibly other products, allows remote attackers to cause a 
          denial of service (crash) via a Hello packet containing a large 
          size value, which triggers a buffer over-read in the 
          HASHwithTransform::Update function in hash.cpp." [3]


MITIGATION:

        MySQL has addressed these issues in a local 5.0 repository of
        mysqldev. "When mysqldev does a push these changes will be 
        propagated to the main repository and, within 24 hours after the
        push, to the public repository." [4]


REFERENCES:

        [1] National Vulnerability Database
            http://nvd.nist.gov/

        [2] National Vulnerability Database (CVE-2008-0226)
            http://nvd.nist.gov/nvd.cfm?cvename=CVE-2008-0226

        [3] National Vulnerability Database (CVE-2008-0227)
            http://nvd.nist.gov/nvd.cfm?cvename=CVE-2008-0227

        [4] MySQL lists
            http://lists.mysql.com/commits/40907

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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