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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
Publisher:         Microsoft
Operating System:  Windows
Impact/Access:     Access Confidential Data       -- Remote/Unauthenticated      
                   Provide Misleading Information -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-2544 CVE-2015-2543 CVE-2015-2505

Original Bulletin: 

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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 
Information Disclosure

Severity: Important

KB Article: 3089250

Version: 1.0

Published Date: September 8, 2015

Executive Summary

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 
Software section.

Affected Software

Microsoft Server Software

Microsoft Exchange Server 2013 Cumulative Update 8

Microsoft Exchange Server 2013 Cumulative Update 9

Microsoft Exchange Server 2013 Service Pack 1

Vulnerability Information

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 
stacktrace details.

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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