Technical Information

Brief overview of the risk:
The vulnerability could allow information disclosure if a user opens or previews a specially crafted email message using an affected edition of Microsoft Outlook. An attacker who successfully exploited this vulnerability could ascertain system information, such as the IP address and open TCP ports, from the target system and other systems that share the network with the target system.
Detailed Information on the risk:

An information disclosure vulnerability exists when Microsoft Outlook does not properly handle the expansion of S/MIME certificate metadata. An attacker who successfully exploited this vulnerability could ascertain system information, such as the IP address and open TCP ports, from the target system and other systems that share the network with the target system.

Further information on this exploit is available at : MS13-094