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AUSCERT External Security Bulletin Redistribution
ESB-2016.1502
Microsoft Security Bulletin MS16-079: Security Update for
Microsoft Exchange Server (3160339)
15 June 2016
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AusCERT Security Bulletin Summary
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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:
https://technet.microsoft.com/en-us/library/security/MS16-079
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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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