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Cisco IronPort Desktop Flag Plug-in for Outlook Information Disclosure

Document ID: 553

http://tools.cisco.com/security/center/content/CiscoSecurityResponse/cisco-sr-20100511-ironport

Revision 1.1

Last Updated on 2010 May 25 12:00  UTC (GMT)

For Public Release 2010 May 11 16:00  UTC (GMT)


Contents

Response
Additional Information
Status of this Notice: Final
Revision History
Cisco Security Procedures

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.

cisco-sr-20100511-ironport-01.gif

This response is posted at: http://tools.cisco.com/security/center/content/CiscoSecurityResponse/cisco-sr-20100511-ironport

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 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 organization.

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 psirt@cisco.com or security-alert@cisco.com for software upgrades.

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

Status of this Notice: Final

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.

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 1.1

2010-May-24

Added fixed software information

Revision 1.0

2010-May-11

Initial 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/web/about/security/psirt/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.