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                         AUSCERT Security Bulletin

                               ASB-2012.0126
                 Multiple Vulnerabilities in WinCC 7.0 SP3
                             12 September 2012

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

Product:              Siemens SIMATIC WinCC
Operating System:     Windows Server 2003
                      Windows Server 2008
                      Windows Server 2008 R2
                      Windows 7
                      Windows XP
Impact/Access:        Access Privileged Data     -- Remote/Unauthenticated      
                      Cross-site Request Forgery -- Remote with User Interaction
                      Cross-site Scripting       -- Remote with User Interaction
                      Unauthorised Access        -- Remote/Unauthenticated      
Resolution:           Patch/Upgrade
CVE Names:            CVE-2012-3031 CVE-2012-3028 CVE-2012-3030
                      CVE-2012-3032 CVE-2012-3034 
Member content until: Friday, October 12 2012

Comment: While most of these vulnerabilities have been addressed in a patch 
         by the vendor, at the time of this advisory's publication one 
         vulnerability remains unpatched. The vendor has provided steps to 
         mitigate the outstanding vulnerability.

OVERVIEW

        Multiple vulnerabilities have been identified in Siemens SIMATIC 
        WinCC version 7.0 SP3.
        
        The vendor describes the WebNavigator component of WinCC as giving 
        "... the users the possibility to control their plants via the web 
        browser with the same look-and-feel like local operator stations." [1]


IMPACT

        The vendor has provided the following description regarding these 
        vulnerabilities:
        
        "WinCC WebNavigator is susceptible to twelve vulnerabilities, which
        compromise (depending on the vulnerability) the confidentiality, 
        integrity or availability of the affected system over the network. 
        WebNavigator is part of WinCC 7.0." [1]
        
        Reflected cross site scripting and cross site request forgery 
        vulnerabilities may allow the attacker to take over the WebNavigator
        session with the victim’s rights. Additionally arbitrary files and 
        database content may be accessible to a remote, unauthenticated
        web user.


MITIGATION

        Siemens provides an update for WinCC 7.0 SP3 which addresses most 
        vulnerabilities discussed in this bulletin. However the cross site 
        request forgery vulnerability remains unpatched, and Siemens 
        recommends the following mitgations:
        
        1. Do not interact with other internet related services whilst
        logged in to WebNavigator.
        2. Log out when WebNavigator is no longer needed.


REFERENCES

        [1] Siemens SIMATIC WinCC Multiple Vulnerabilities
            http://www.siemens.com/corporate-technology/pool/de/forschungsfelder/siemens_security_advisory_ssa-864051.pdf

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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