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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
Publisher:         Microsoft
Operating System:  Windows
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-6111  

Original Bulletin: 

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Microsoft Security Bulletin MS15-120: Security Update for IPSec to Address 
Denial of Service (3102939)

Document Metadata

Bulletin Number: MS15-120

Bulletin Title: Security Update for IPSec to Address Denial of Service

Severity: Important

KB Article: 3102939

Version: 1.0

Published Date: November 10, 2015

Executive Summary

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.

Affected Software

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[1]

Windows RT 8.1[1]

Windows Server 2012 (Server Core installation)

Windows Server 2012 R2 (Server Core installation)

[1]This update is only available via Windows Update.

Vulnerability Information

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 
encryption negotiation.

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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