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AUSCERT Security Bulletin
ASB-2009.1099.2
BlackBerry Device Software Updated
30 September 2009
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AusCERT Security Bulletin Summary
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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
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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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