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             AUSCERT External Security Bulletin Redistribution

         Microsoft Security Bulletin MS16-079: Security Update for
                    Microsoft Exchange Server (3160339)
                               15 June 2016


        AusCERT Security Bulletin Summary

Product:           Microsoft Exchange Server
Publisher:         Microsoft
Operating System:  Windows
Impact/Access:     Access Confidential Data -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-0028  

Original Bulletin: 

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Microsoft Security Bulletin MS16-079: Security Update for Microsoft Exchange 
Server (3160339)

Executive Summary

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.

Affected Software

Microsoft Exchange Server 2007

Microsoft Exchange Server 2010

Microsoft Exchange Server 2013

Microsoft Exchange Server 2016

Vulnerability Information

Microsoft Exchange Information Disclosure Vulnerability - CVE-2016-0028

An email filter bypass exists in the way that Microsoft Exchange parses HTML 
messages that could allow information disclosure. An attacker who successfully
exploited the vulnerability could identify, fingerprint, and track a user 
online if the user views email messages using Outlook Web Access (OWA). An 
attacker could also combine this vulnerability with another one, such as a 
Cross-Site Request Forgery (CSRF), to amplify the attack.

To exploit the vulnerability, an attacker could include specially crafted 
image URLs in OWA messages that could be loaded, without warning or filtering,
from the attacker-controlled URL. This callback vector provides an information
disclosure tactic used in web beacons and other types of tracking systems. The
update corrects the way that Exchange parses HTML messages.

The following table contains links to the standard entry for each 
vulnerability in the Common Vulnerabilities and Exposures list:

Vulnerability title 					CVE number 	Publicly disclosed 	Exploited

Microsoft Exchange Information Disclosure Vulnerability CVE-2016-0028 	No 			No

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