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Cisco Security Response: Cisco IronPort Desktop Flag Plug-in for
Outlook Information Disclosure

For Public Release 2010 May 11 1600 UTC (GMT)

+---------------------------------------------------------------------

Cisco Response
==============

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.

<<< See online version for image >>>

This response is posted at:

http://www.cisco.com/warp/public/707/cisco-sr-20100511-ironport.shtml

Additional Information
======================

Cisco IronPort Desktop Flag Plug-in for Outlook versions from 6.2.4.3
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
CVE-2010-1568.

Workaround
+---------

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 will update this section when fixed software is available for
download. The affected product in this security response 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 psirt@cisco.com or security-alert@cisco.com for
software upgrades.

http://www.ironport.com/support/contact_support.html

Status of this Notice: INTERIM
==============================

THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY
KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE
INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS
AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS
DOCUMENT AT ANY TIME. CISCO EXPECTS TO UPDATE THIS DOCUMENT AS NEW
INFORMATION BECOMES AVAILABLE.

A stand-alone copy or Paraphrase of the text of this document that
omits the distribution URL in the following section is an
uncontrolled copy, and may lack important information or contain
factual errors.

Revision History
================

+---------------------------------------+
| Revision |             | Initial      |
| 1.0      | 2010-May-11 | public       |
|          |             | release.     |
+---------------------------------------+

Cisco Security Procedures
=========================

Complete information on reporting security vulnerabilities in Cisco
products, obtaining assistance with security incidents, and
registering to receive security information from Cisco, is available
on Cisco's worldwide website at:

http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html

This includes instructions for press inquiries regarding Cisco security
notices.  All Cisco security advisories are available at:

http://www.cisco.com/go/psirt
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