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AUSCERT External Security Bulletin Redistribution
ESB-2017.0670
MS17-019 - Important: Security Update for Active Directory
Federation Services (4010320)
15 March 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft Active Directory Federation Services (ADFS)
Publisher: Microsoft
Operating System: Windows Server 2008
Windows Server 2008 R2
Windows Server 2012
Windows Server 2012 R2
Windows Server 2016
Impact/Access: Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2017-0043
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS17-019
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Microsoft Security Bulletin MS17-019: Security Update for Active Directory
Federation Services (4010320)
Bulletin Number: MS17-019
Bulletin Title: Security Update for Active Directory Federation Services
Severity: Important
KB Article: 4010320
Version: 1.0
Published Date: 14/02/17
Executive Summary
This security update resolves a vulnerability in Active Directory Federation
Services (ADFS). The vulnerability could allow information disclosure if an
attacker sends a specially crafted request to an ADFS server, allowing the
attacker to read sensitive information about the target system.
The update addresses the vulnerability by adding additional verification
checks in ADFS. For more information about the vulnerability, see the
Vulnerability Information section.
For more information about this update, see Microsoft Knowledge Base Article
4010320.
Affected Software
Windows Server 2008
Windows Server 2008 R2
Windows Server 2012
Windows Server 2012 R2
Windows Server 2016
Vulnerability Information
Microsoft Active Directory Federation Services Information Disclosure
Vulnerability - CVE-2017-0043
An information disclosure vulnerability exists when Windows Active Directory
Federation Services (ADFS) honors XML External Entities. An authenticated
attacker who successfully exploited this vulnerability would be able to read
sensitive information about the target system.
To exploit this condition, an authenticated attacker would need to send a
specially crafted request to the ADFS service.Note that the information
disclosure vulnerability by itself would not be sufficient for an attacker to
compromise a system. However, an attacker could combine this vulnerability
with additional vulnerabilities to further exploit the system. The update
addresses the vulnerability by causing ADFS to ignore these malicious
entities.
Mitigating Factors
Microsoft has not identified any mitigating factors for this vulnerability.
Workarounds
Microsoft has not identified any workarounds for this vulnerability.
Security Update Deployment
For Security Update Deployment information, see the Microsoft Knowledge Base
article referenced here in the Executive Summary.
Acknowledgments
Microsoft recognizes the efforts of those in the security community who help
us protect customers through coordinated vulnerability disclosure. See
Acknowledgments for more information.
Disclaimer
The information provided in the Microsoft Knowledge Base is provided "as is"
without warranty of any kind. Microsoft disclaims all warranties, either
express or implied, including the warranties of merchantability and fitness
for a particular purpose. In no event shall Microsoft Corporation or its
suppliers be liable for any damages whatsoever including direct, indirect,
incidental, consequential, loss of business profits or special damages, even
if Microsoft Corporation or its suppliers have been advised of the possibility
of such damages. Some states do not allow the exclusion or limitation of
liability for consequential or incidental damages so the foregoing limitation
may not apply.
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