Microsoft Exchange: Multiple vulnerabilities

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2014.2331
         Vulnerabilities in Microsoft Exchange Server Could Allow
                     Elevation of Privilege (3009712)
                              9 December 2014

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Microsoft Exchange
Publisher:         Microsoft
Operating System:  Windows
Impact/Access:     Cross-site Scripting           -- Remote with User Interaction
                   Provide Misleading Information -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2014-6336 CVE-2014-6326 CVE-2014-6325
                   CVE-2014-6319  

Original Bulletin: 
   https://technet.microsoft.com/library/security/ms14-075

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Microsoft Security Bulletin MS14-075 - Important
Vulnerabilities in Microsoft Exchange Server Could Allow Elevation of Privilege
(3009712)

Published: December 9, 2014

Version: 1.0

Executive Summary

This security update resolves four privately reported vulnerabilities in 
Microsoft Exchange Server. The most severe of these vulnerabilities could 
allow elevation of privilege if a user clicks a specially crafted URL that 
takes them to a targeted Outlook Web Access site. An attacker would have no 
way to force users to visit a specially crafted website. Instead, an attacker
would have to convince them to visit the website, typically by getting them to
click a link in an email message or Instant Messenger message that takes them
to the attacker's website, and then convince them to click the specially 
crafted URL.

This security update is rated Important for all supported editions of 
Microsoft Exchange Server 2007, Microsoft Exchange Server 2010, and Microsoft
Exchange Server 2013.

Affected Software

Microsoft Exchange Server 2007 Service Pack 3 (2996150)
Microsoft Exchange Server 2010 Service Pack 3 (2986475)
Microsoft Exchange Server 2013 Service Pack 1 (3011140)
Microsoft Exchange Server 2013 Cumulative Update 6 (3011140)

Vulnerability Information

Multiple OWA XSS Vulnerabilities

Elevation of privilege vulnerabilities exist when Microsoft Exchange Server 
does not properly validate input. An attacker who successfully exploited these 
vulnerabilities could run script in the context of the current user. An 
attacker could, for example, read content that the attacker is not authorized 
to read, use the victim's identity to take actions on the Outlook Web Access
site on behalf of the victim, such as change permissions and delete content,
and inject malicious content in the browser of the victim. Any system that 
is used to access an affected version of Outlook Web Access would 
potentially be at risk to attack. The update addresses the vulnerabilities
by ensuring that URLs are properly sanitized.

OWA XSS Vulnerability	CVE-2014-6325 No	No
OWA XSS Vulnerability	CVE-2014-6326 No	No

Outlook Web Access Token Spoofing Vulnerability - CVE-2014-6319

A token spoofing vulnerability exists in Exchange Server when Microsoft Outlook
Web Access (OWA) fails to properly validate a request token. An attacker who
successfully exploited this vulnerability could then use the vulnerability to 
send email that appears to come from a user other than the attacker (e.g., 
from a trusted source). Customers who access their Exchange Server email via 
Outlook Web Access are primarily at risk from this vulnerability. The update 
addresses the vulnerability by ensuring that Outlook Web Access properly 
validates request tokens.

Exchange URL Redirection Vulnerability - CVE-2014-6336

A spoofing vulnerability exists in Microsoft Exchange when Microsoft Outlook 
Web Access (OWA) fails to properly validate redirection tokens. An attacker 
who successfully exploited this vulnerability could redirect a user to an 
arbitrary domain from a link that appears to originate from the user's domain. 
An attacker could use the vulnerability to send email that appears to come 
from a user other than the attacker. Customers who access their Exchange
Server email via Outlook Web Access are primarily at risk from this 
vulnerability. The update addresses the vulnerability by ensuring that URLs
are properly sanitized.

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