Microsoft Outlook Web Access Obtain Information Vulnerability
16 Aug. 2016
Outlook Web Access (OWA) in Microsoft Exchange Server 2013 SP1, Cumulative Update 11, and Cumulative Update 12 and 2016 Gold and Cumulative Update 1 does not properly restrict loading of IMG elements, which makes it easier for remote attackers to track users via a crafted HTML e-mail message, aka "Microsoft Exchange Information Disclosure Vulnerability."
* Microsoft Outlook Web Access
This security update resolves vulnerabilites in Microsoft Exchange Server. The most severe of the vulnerabilities could allow information disclosure if an attacker sends a specially crafted image URL in an Outlook Web Access (OWA) message that is loaded, without warning or filtering, from the attacker-controlled URL.
This security update is rated Important for all supported editions of Microsoft Exchange Server 2007, Microsoft Exchange Server 2010, Microsoft Exchange Server 2013, and Microsoft Exchange Server 2016. For more information, see the Affected Software and Vulnerability Severity Ratings section.
The security update addresses the vulnerabilities by correcting the way that Microsoft Exchange parses HTML messages. For more information about the vulnerabilities, see the Vulnerability Information section.