CERT-In Vulnerability Note
CIVN-2015-0284
Microsoft Windows Kerberos Authentication Bypass Vulnerability
Original Issue Date:November 12, 2015
Severity Rating: HIGH
Software Affected
- Windows Vista SP 2
- Windows Vista x64 Edition SP 2
- Windows Server 2008 for 32-bit Systems SP 2
- Windows Server 2008 for x64-based Systems SP 2
- Windows Server 2008 for Itanium-based Systems SP 2
- Windows 7 for 32-bit Systems SP 1
- Windows 7 for x64-based Systems SP 1
- Windows Server 2008 R2 for x64-based Systems SP 1
- Windows Server 2008 R2 for Itanium-based Systems SP 1
- Windows 8 for 32-bit Systems
- Windows 8 for x64-based Systems
- Windows 8.1 for 32-bit Systems
- Windows 8.1 for x64-based Systems
- Windows Server 2012
- Windows Server 2012 R2
- Windows 10 for 32-bit Systems
- Windows 10 for x64-based Systems
- Windows 10 Version 1511 for 32-bit Systems
- Windows 10 Version 1511 for x64-based Systems
- Windows Server 2008 for 32-bit Systems SP 2 (Server Core installation)
- Windows Server 2008 for x64-based Systems SP 2 (Server Core installation)
- Windows Server 2008 R2 for x64-based Systems SP 1 (Server Core installation)
- Windows Server 2012 (Server Core installation)
- Windows Server 2012 R2 (Server Core installation)
Overview
A Vulnerability has been reported in Microsoft Windows Kerberos which could allow an attacker to bypass security restrictions.
Description
This vulnerability exists due to improper authentication checks by the Kerberos feature of Microsoft Windows. A local attacker who has physical access to the target system could exploit the vulnerability by connecting the system to a malicious Kerberos Key Distribution Center (KDC).
Successful exploitation of the vulnerability could allow an attacker to decrypt sensitive information that is otherwise protected by the BitLocker feature.
Note: Only domain-joined systems having BitLocker enabled without a PIN or USB key are affected.
Solution
Apply appropriate patches as mentioned in the Microsoft Security Bulletin
MS15-122
Vendor Information
Microsoft
https://technet.microsoft.com/library/security/MS15-122
References
Microsoft
https://technet.microsoft.com/library/security/MS15-122
Cisco
http://tools.cisco.com/security/center/viewAlert.x?alertId=41866
Security Tracker
http://securitytracker.com/id/1034125
CVE Name
CVE-2015-6095
Disclaimer
The information provided herein is on "as is" basis, without warranty of any kind.
Contact Information
Email: info@cert-in.org.in Phone: +91-11-24368572
Postal address
Indian Computer Emergency Response Team (CERT-In)
Ministry of Electronics and Information Technology
Government of India
Electronics Niketan
6, CGO Complex, Lodhi Road,
New Delhi - 110 003
India
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