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                         AUSCERT Security Bulletin

                               ASB-2015.0013
         ProxyClient and Unified Agent certificate validation flaw
                              29 January 2015

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

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

Product:              Blue Coat ProxyClient
                      Blue Coat Unified Agent
Operating System:     Windows
Impact/Access:        Administrator Compromise        -- Remote/Unauthenticated
                      Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                      Reduced Security                -- Remote/Unauthenticated
Resolution:           Patch/Upgrade
Member content until: Saturday, February 28 2015

OVERVIEW

        A high severity vulnerability has been identified in Blue Coat 
        ProxyClient versions prior to 3.3.3.3 and 3.4.4.10 and Blue Coat 
        Unified Agent prior to version 4.1.3.151952. [1]


IMPACT

        Blue Coat provides the following details regarding the 
        vulnerability:
        
        "A flaw in the validation of the Client Manager certificate 
        performed by the ProxyClient and the Unified agent could allow an 
        attacker to pose as the Client Manager. An attacker could use this 
        vulnerability to modify the configuration parameters of ProxyClient
        and Unified Agent, to deliver malicious web content to ProxyClient 
        and Unified Agent, and to deliver malicious software updates to 
        ProxyClient. An attacker potentially could use this flaw to gain 
        full administrative acces to the client". [1]


MITIGATION

        Blue Coat advises users to apply the provided fixes. [1]


REFERENCES

        [1] ProxyClient and Unified Agent certificate validation flaw
            https://bto.bluecoat.com/security-advisory/sa89

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.

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