Document ID: 553
Last Updated on 2010 May 25 12:00 UTC (GMT)
For Public Release 2010 May 11 16:00 UTC (GMT)
Status of this Notice: Final Revision HistoryCisco Security Procedures
The Cisco IronPort Desktop Flag Plug-in for Outlook enables Microsoft
Outlook users to encrypt email messages via a Cisco IronPort Encryption
Appliance or Email Security Appliance. In order to cause an email message to be
encrypted, a user must click the Send Secure button to
securely deliver the email message.
If multiple email messages are being composed simultaneously and the
Send Secure button is used to send more than one of the email
messages, an error condition may occur where only the first email message sent
is successfully encrypted. The remaining email messages sent using the
Send Secure button will not be encrypted and may result in the
disclosure of sensitive information if intercepted by an unauthorized party.
There is a workaround for this issue.
Below is an example image showing a Microsoft Outlook email composition
window with the Cisco Ironport Flag Plug-in for Outlook installed. Users with
no Send Secure icon in their Outlook client do not have the
plug-in installed and are not affected.
This response is posted at: http://tools.cisco.com/security/center/content/CiscoSecurityResponse/cisco-sr-20100511-ironport
Cisco IronPort Desktop Flag Plug-in for Outlook versions from 18.104.22.168
up to, but not including, 6.5.0-006 are affected by this issue. Cisco IronPort
is currently developing a software fix that will be available via the Cisco
IronPort support website. This Security Response will be updated once version
information for the fixed software is available.
This issue is documented in Cisco IronPort bug 65623 and has been
assigned Common Vulnerabilities and Exposures (CVE) identifier
It is possible to mitigate this issue by ensuring that only one email
composition window is open when using the Send Secure button.
Secure email messages should be composed one at a time until a fixed version of
the Cisco IronPort Desktop Flag Plug-in for Outlook can be installed.
Obtaining Fixed Software
Cisco IronPort Desktop Flag Plug-in for Outlook version 6.5.1 that
contains the software fix for this issue can be obtained from the Cisco
IronPort support portal by customers with a registered login. End users will
need to obtain the fixed software from their internal support
Cisco IronPort Desktop Flag Plug-in for Outlook is directly supported
by Cisco IronPort. Customers should contact Cisco IronPort technical support at
the link below to obtain software fixes. Cisco IronPort technical support will
assist customers in determining the correct fixes and installation procedures.
Customers should direct all warranty questions to IronPort technical support.
Note: Do not contact email@example.com or firstname.lastname@example.org for
Status of this Notice: Final
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Added fixed software information
Initial public release.
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