Microsoft Active Directory Federation Services: Cross-site Scripting -- Remote with User Interaction

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.1492
           MS15-062 Vulnerability in Active Directory Federation
           Services Could Allow Elevation of Privilege (3062577)
                                9 June 2015

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

Product:           Microsoft Active Directory Federation Services
Publisher:         Microsoft
Operating System:  Windows Server 2008
                   Windows Server 2008 R2
                   Windows Server 2012
Impact/Access:     Cross-site Scripting -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-1757  

Original Bulletin: 
   https://technet.microsoft.com/en-us/library/security/MS15-062

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Bulletin Number:	MS15-062
Bulletin Title:		Vulnerability in Active Directory Federation
			Services Could Allow Elevation of Privilege
Severity:		Important
KB Article:		3062577
Version:		1.0
Published Date: June 9, 2015

Executive Summary

This security update resolves a vulnerability in Microsoft Active
Directory Federation Services (AD FS). The vulnerability could allow
elevation of privilege if an attacker submits a specially crafted URL to
a target site. Due to the vulnerability, in specific situations specially
crafted script is not properly sanitized, which subsequently could lead
to an attacker-supplied script being run in the security context of a
user who views the malicious content. For cross-site scripting attacks,
this vulnerability requires that a user be visiting a compromised site
for any malicious action to occur.

This security update is rated Important for Active Directory Federation
Services 2.0 and Active Directory Federation Services 2.1.

Affected Software

Active Directory Federation Services 2.0
Active Directory Federation Services 2.1

Vulnerability Information

ADFS XSS Elevation of Privilege Vulnerability - CVE-2015-1757
An elevation of privilege vulnerability exists in the way that URLs are
sanitized in Active Directory Federation Services (AD FS). An attacker who
successfully exploited this vulnerability could perform cross-site scripting
attacks and run script in the security context of the logged-on user.

To exploit this vulnerability, an attacker must have the ability to submit
a specially crafted URL to a target site. Due to the vulnerability, in
specific situations specially crafted script is not properly sanitized,
which subsequently could lead to an attacker-supplied script being run
in the security context of a user who views the malicious content. For
cross-site scripting attacks, this vulnerability requires that a user be
visiting a compromised site for any malicious action to occur. For instance,
after an attacker has successfully submitted a specially crafted URL to a
target site, any webpage on that site that contains the specially crafted
URL is a potential vector for cross-site scripting attacks. When a user
visits a webpage that contains the specially crafted URL, the script could
be run in the security context of the user.

The security update addresses the vulnerability by correcting how AD FS
handles the HTML encoding of HTTP responses.

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

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