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ASB-2009.1099.2 - UPDATE BlackBerry Device: Provide misleading information - Remote/unauthenticated

Date: 30 September 2009
Related Files: ASB-2009.1099  

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                         AUSCERT Security Bulletin

                              ASB-2009.1099.2
                    BlackBerry Device Software Updated
                             30 September 2009

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

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

Product:              BlackBerry Device
Operating System:     Mobile Devices
Impact/Access:        Provide Misleading Information -- Remote/Unauthenticated
Resolution:           Patch/Upgrade
CVE Names:            CVE-2009-3477  
Member content until: Thursday, October 29 2009

Revision History:     September 30 2009: Added CVE Reference
                      September 29 2009: Initial Release

OVERVIEW

        BlackBerry have released an update for the BlackBerry Device 
        Software correcting a security vulnerability.


IMPACT

        The vendor has provided the following information regarding this
        vulnerability:
        
        "A malicious user could create a web site that includes a 
        certificate that is purposely altered using null (hidden) characters 
        in the certificate's Common Name (CN) field or otherwise manipulated 
        to deceive a BlackBerry device user into believing they have 
        connected to a trusted web site. If the malicious user then performs 
        a phishing-style attack by sending the BlackBerry device user a link 
        to the web site in an SMS or email message that appears to be from a 
        trusted source, and the BlackBerry device user chooses to access that 
        site, the BlackBerry Browser will correctly detect the mismatch 
        between the certificate and the domain name and display a dialog box 
        that prompts the user to close the connection. However, the dialog 
        box does not display null characters, so the user may believe they 
        are connecting to a trusted site and disregard the recommended 
        action to close the connection."[1]


MITIGATION

        This vulnerability has been corrected in the following versions [1]:
        
        BlackBerry Device Software Version 4.5.0.173 or later
        BlackBerry Device Software Version 4.6.0.303 or later
        BlackBerry Device Software Version 4.6.1.309 or later
        BlackBerry Device Software Version 4.7.0.179 or later
        BlackBerry Device Software Version 4.7.1.57 or later 


REFERENCES

        [1] BlackBerry Browser dialog box does not clearly indicate mismatches
            between web site domain names and associated certificates
            http://www.blackberry.com/btsc/search.do?cmd=displayKC&docType=kc&externalId=KB19552

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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