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AUSCERT External Security Bulletin Redistribution
Vulnerability in Network Policy Server RADIUS Implementation
Could Cause Denial of Service (3014029)
14 January 2015
AusCERT Security Bulletin Summary
Product: Microsoft Windows
Operating System: Windows Server 2003
Windows Server 2008
Windows Server 2008 R2
Windows Server 2012
Windows Server 2012 R2
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2015-0015
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Microsoft Security Bulletin MS15-007 - Important
Vulnerability in Network Policy Server RADIUS Implementation Could Cause
Denial of Service (3014029)
Published: January 13, 2015
This security update resolves a privately reported vulnerability in Microsoft
Windows. The vulnerability could allow denial of service on an Internet
Authentication Service (IAS) or Network Policy Server (NPS) if an attacker
sends specially crafted username strings to the IAS or NPS. Note that the
denial of service vulnerability would not allow an attacker to execute code or
to elevate user rights; however, it could prevent RADIUS authentication on the
IAS or NPS.
This security update is rated Important for all supported editions of Windows
Server 2003, Windows Server 2008 (excluding Itanium), Windows Server 2008 R2
(excluding Itanium), Windows Server 2012, and Windows Server 2012 R2.
Windows Server 2003 Service Pack 2
Windows Server 2003 x64 Edition Service Pack 2
Windows Server 2003 with SP2 for Itanium-based Systems
Windows Server 2008 for 32-bit Systems Service Pack 2
Windows Server 2008 for x64-based Systems Service Pack 2
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2012
Windows Server 2012 R2
Network Policy Server RADIUS Implementation Denial of Service Vulnerability -
This is a denial of service vulnerability. An unauthenticated attacker who
successfully exploited this vulnerability could send specially crafted
username strings to an Internet Authentication Service (IAS) or Network Policy
Server (NPS), causing a denial of service condition for RADIUS authentication
on the IAS or NPS. Note that the denial of service vulnerability would not
allow an attacker to execute code or to elevate user rights; however, it could
prevent RADIUS authentication on the IAS or NPS. An attacker who successfully
exploited the vulnerability could cause the target system to stop responding.
Network Policy Servers that allow remote, untrusted users to authenticate are
at particular risk from this vulnerability. The update addresses the denial of
service vulnerability by changing how Network Policy Servers parse username
queries when implementing RADIUS.
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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