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             AUSCERT External Security Bulletin Redistribution

             Microsoft Security Bulletin MS15-040 - Important
                               15 April 2015


        AusCERT Security Bulletin Summary

Product:           Active Directory Federation Services
Publisher:         Microsoft
Operating System:  Windows Server 2012 R2
Impact/Access:     Access Privileged Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-1638  

Original Bulletin: 

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Microsoft Security Bulletin MS15-040 - Important

Vulnerability in Active Directory Federation Services Could Allow Information
Disclosure (3045711)

Published: April 14, 2015

Version: 1.0

Executive Summary

This security update resolves a vulnerability in Active Directory Federation 
Services (AD FS). The vulnerability could allow information disclosure if a 
user leaves their browser open after logging off from an application and an 
attacker reopens the application in the browser immediately after the user has
logged off.

This security update is rated Important for AD FS 3.0 when installed on 
x64-based editions of Windows Server 2012 R2.

For more information, see the Affected Software section.

Affected Software

Windows Server 2012 R2 

Windows Server 2012 R2 (Server Core installation)

Vulnerability Information

Active Directory Federation Services Information Disclosure Vulnerability - 

An information disclosure vulnerability exists when Active Directory 
Federation Services (AD FS) fails to properly log off a user. The 
vulnerability could allow unintentional information disclosure. An attacker 
who successfully exploited this vulnerability could gain access to a user's 
information by reopening an application from which the user has logged off. 
Since the logoff actually fails an attacker is not prompted to enter a 
username or password. An attacker could then use this vulnerability to 
discover information to which an AD FS user has access.

Servers with the AD FS role installed are affected by this vulnerability. The
update addresses the vulnerability by ensuring that the logoff process 
properly logs off the user.

Microsoft received information about this vulnerability through coordinated 
vulnerability disclosure. When this security bulletin was issued, Microsoft 
had not received any information to indicate that this vulnerability had been
publicly used to attack customers.

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