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AUSCERT External Security Bulletin Redistribution
Microsoft Security Bulletin MS15-103 - Important - Vulnerabilities in
Microsoft Exchange Server Could Allow Information Disclosure
9 September 2015
AusCERT Security Bulletin Summary
Product: Microsoft Exchange Server
Operating System: Windows
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
Provide Misleading Information -- Remote with User Interaction
CVE Names: CVE-2015-2544 CVE-2015-2543 CVE-2015-2505
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Microsoft Security Bulletin MS15-103: Vulnerabilities in Microsoft Exchange
Server Could Allow Information Disclosure (3089250)
Bulletin Number: MS15-103
Bulletin Title: Vulnerabilities in Microsoft Exchange Server Could Allow
KB Article: 3089250
Published Date: September 8, 2015
This security update resolves vulnerabilities in Microsoft Exchange Server.
The most severe of the vulnerabilities could allow information disclosure if
Outlook Web Access (OWA) fails to properly handle web requests, and sanitize
user input and email content.
This security update is rated Important for all supported editions of
Microsoft Exchange Server 2013. For more information, see the Affected
Microsoft Server Software
Microsoft Exchange Server 2013 Cumulative Update 8
Microsoft Exchange Server 2013 Cumulative Update 9
Microsoft Exchange Server 2013 Service Pack 1
Exchange Information Disclosure Vulnerability - CVE-2015-2505
An information disclosure vulnerability exists in Microsoft Exchange Server
when Outlook Web Access (OWA) fails to properly handle web requests. An
attacker who successfully exploited the vulnerability could discover
To exploit the vulnerability, an attacker would have to create a specially
crafted web application request and then submit it to a web application.
Multiple Exchange Spoofing Vulnerabilities
Spoofing vulnerabilities exist in Microsoft Exchange Server when OWA does not
properly sanitize specially crafted email. An authenticated attacker could
exploit the vulnerabilities by sending a specially crafted email to a user. An
attacker could then perform HTML injection attacks on affected systems, and
attempt to trick the user into disclosing sensitive information.
To exploit the vulnerabilities, the user must click a specially crafted URL.
In an email attack scenario, an attacker could send an email message
containing the specially crafted URL to the user via OWA in an attempt to
convince the user to click it.
In a web-based attack scenario, an attacker could host a malicious website
designed to appear as a legitimate website to the user. However, the attacker
would have no way to force the user to visit the malicious website. The
attacker would have to convince the user to visit the malicious website,
typically by enticing the user to click a link in either an instant messenger
or email message that takes the user to the attacker's malicious website, and
then convince the user to interact with content on the malicious website.
The security update addresses the vulnerabilities by helping to ensure that
OWA properly sanitizes email content.
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
Exchange Spoofing Vulnerability CVE-2015-2543 No No
Exchange Spoofing Vulnerability CVE-2015-2544 No No
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