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AUSCERT External Security Bulletin Redistribution
Microsoft Security Bulletin MS15-120: Security Update for
IPSec to Address Denial of Service (3102939)
11 November 2015
AusCERT Security Bulletin Summary
Product: Microsoft Windows
Operating System: Windows
Impact/Access: Denial of Service -- Existing Account
CVE Names: CVE-2015-6111
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Microsoft Security Bulletin MS15-120: Security Update for IPSec to Address
Denial of Service (3102939)
Bulletin Number: MS15-120
Bulletin Title: Security Update for IPSec to Address Denial of Service
KB Article: 3102939
Published Date: November 10, 2015
This security update resolves a denial of service vulnerability in Microsoft
Windows. An attacker who successfully exploited the vulnerability could cause
the system to become nonresponsive. To exploit the vulnerability an attacker
must have valid credentials.
This security update is rated Important for all supported releases of Windows
8, Windows Server 2012, Windows RT, Windows 8.1, Windows Server 2012 R2, and
Windows RT 8.1. For more information, see the Affected Software section.
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 RT 8.1
Windows Server 2012 (Server Core installation)
Windows Server 2012 R2 (Server Core installation)
This update is only available via Windows Update.
Windows IPSec Denial of Service Vulnerability CVE-2015-6111
A denial of service vulnerability exists in Windows when the Internet Protocol
Security (IPSec) service improperly handles encryption negotiation. An
attacker who successfully exploited the vulnerability could cause the system
to become nonresponsive.
To exploit this vulnerability an attacker must have valid credentials. An
attacker could exploit this vulnerability by using a malicious application to
connect to a target machine and cause the server to become nonresponsive. The
update addresses the vulnerability by adding an additional check to verify
This vulnerability has been publicly disclosed. It has been assigned Common
Vulnerability and Exposure number CVE-2015-6111. At the time this security
bulletin was originally issued, Microsoft was unaware of any attack attempting
to exploit this vulnerability.
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