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BlackBerry Attachment Service Buffer Overflow (.doc file)
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SUMMARY
" <http://www.blackberry.com/products/software/index.shtml> BlackBerry
Enterprise Server software sits behind your organization's firewall and is
designed to tightly integrate with existing enterprise systems, securely
extending wireless communications and corporate data to mobile users."
A specially crafted Microsoft Word (.doc) file opened on a BlackBerry
device could potentially allow code execution.
DETAILS
Vulnerable Systems:
* BlackBerry Enterprise Server for IBM Lotus Domino version 2.2 and
above
* BlackBerry Enterprise Server for Microsoft Exchange version 3.6 and
above
* BlackBerry Enterprise Server for Novell GroupWise version 4.0 and
above
A corrupt Microsoft Word (.doc) file opened on a BlackBerry wireless
device could potentially provide a means to execute arbitrary code on the
BlackBerry Attachment Service component of the BlackBerry Enterprise
Server.
Workaround:
An administrator can exclude Microsoft Word files from being processed by
the Attachment Service in the BlackBerry Enterprise Server, or disable the
Attachment Service completely.
To exclude Microsoft Word files from being processed by the Attachment
Service
1. On the desktop, click Start > Programs > BlackBerry Enterprise Server
BlackBerry Enterprise Server Configuration.
2. Click the Attachment Server tab.
3. In the Format Extensions field, delete the .doc extension.
Note: Format Extensions is an editable field that lists all the
extensions that the Attachment Service will open. A colon is used as a
delimiter.
4. Click Apply, then click OK.
Even though the .doc extension has been removed from the list of supported
file types, the Attachment Service may automatically detect a .doc file
with a renamed extension and attempt to process the file. Administrators
may need to disable the Attachment Service.
To disable the Attachment Service
1. In Microsoft Windows Administrative Tools, double-click Services.
2. Right-click BlackBerry Attachment Service, then click Stop.
3. Close the Services window.
Vendor Status:
Depending on your environment and the BlackBerry Enterprise Server
version, install the appropriate software upgrades.
Microsoft Exchange:
For BlackBerry Enterprise Server 3.6, install Service Pack 7.
For BlackBerry Enterprise Server 4.0, install Service Pack 3, then install
version 4.0 Service Pack 3 Hotfix 3.
IBM Lotus Domino:
For BlackBerry Enterprise Server 2.2, a resolution for this issue has been
developed and is currently undergoing testing. A software upgrade will be
made available as soon as testing is complete.
For BlackBerry Enterprise Server 4.0, install Service Pack 3, then install
version 4.0 Service Pack 3 Hotfix 4.
Novell GroupWise:
Install BlackBerry Enterprise Server 4.0 Service Pack 3, then install
version 4.0 Service Pack 3 Hotfix 1.
To obtain the BlackBerry Enterprise Server software, go to the
<http://www.blackberry.com/support/downloads/index.shtml> BlackBerry
Software Download Information web site.
ADDITIONAL INFORMATION
The information has been provided by <mailto:lukew@sktbcs.com> lukew.
The original article can be found at:
<http://www.blackberry.com/knowledgecenterpublic/livelink.exe/fetch/2000/8021/8149/8052/Support_-_Corrupt_Word_file_may_cause_buffer_overflow_in_the_BlackBerry_Attachment_Service.html?nodeid=1181753&vernum=2>
http://www.blackberry.com/knowledgecenterpublic/livelink.exe/fetch/2000/8021/8149/8052/Support_-_Corrupt_Word_file_may_cause_buffer_overflow_in_the_BlackBerry_Attachment_Service.html?nodeid=1181753&vernum=2
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