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AA-2007.0030                  AUSCERT Advisory

                         [Win][UNIX/Linux][Cisco]
       Remote Denial of Service Vulnerability in RSA BSAFE Crypto-C
                           and Cert-C libraries
                                25 May 2007
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        AusCERT Advisory Summary
        ------------------------

Product:              RSA BSAFE Crypto-C library prior to 6.3.1
                      RSA BSAFE Cert-C library prior to 2.8
Operating System:     Windows
                      UNIX variants (UNIX, Linux, OSX)
                      Cisco
Impact:               Denial of Service
Access:               Remote/Unauthenticated
CVE Names:            CVE-2006.3894
Member content until: Friday, June 22 2007

Ref:                  ESB-2007.0344

OVERVIEW

        The RSA BSAFE Crypto-C and Cert-C libraries are vulnerable to a
        remote denial of service attack [1]. These libraries are used to 
        implement cryptographic services in many third party applications,
        which may also be affected by this issue.


IMPACT

        Remote attackers may be able to cause systems using products that
        use the affected libraries to enter a denial of service state.

        Products that use these libraries include several Cisco products,
        including Cisco IOS, Cisco IOS XR, Cisco PIX, Cisco Firewall
        Services Manager and Cisco CallManager [2].


MITIGATION

        Users of the RSA BSAFE libraries can upgrade to the latest versions
        of the affected libraries (Crypto-C 6.3.1 and Cert-C 2.8). Users
        of third party products will need to update those products.

        Cisco has released a bulletin containing both fixes and mitigation
        strategies for this issue. Please see the references section for
        links to the Cisco advisories [2][3].


REFERENCES

        [1] US-CERT Vulnerability Note VU#754281
            http://www.kb.cert.org/vuls/id/754281

        [2] Cisco Security Advisory: Vulnerability in Crypto Library
            http://www.cisco.com/en/US/products/products_security_advisory09186a0080847c5d.shtml

        [3] Cisco Applied Intelligence Response: Identifying and Mitigating
            Exploitation of the Vulnerability in Crypto Library
            http://www.cisco.com/en/US/products/products_applied_intelligence_response09186a0080847c96.shtml

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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