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                           CERT-Renater

               Note d'Information No. 2015/VULN150
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DATE                : 15/07/2015

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Windows version Server 2003, Vista, Server 2008, 7,
                      8, 8.1, Server 2012, RT, RT 8.1 running Netlogon.

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KB3068457
https://technet.microsoft.com/en-us/library/security/MS15-071
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Microsoft Security Bulletin MS15-071: Vulnerability in Netlogon Could
Allow Spoofing (3068457)

Bulletin Number: MS15-071

Bulletin Title: Vulnerability in Netlogon Could Allow Spoofing

Severity: Important

KB Article: 3068457

Version: 1.0

Published Date: July 14, 2015


Executive Summary

This security update resolves a vulnerability in Microsoft Windows. The
vulnerability could allow spoofing if an attacker who is logged on to a
domain-joined system runs a specially crafted application that could
establish a connection with other domain-joined systems as the
impersonated user or system. The attacker must be logged on to a
domain-joined system and be able to observe network traffic.

This security update is rated Important for all supported editions of
Windows. For more information, see the Affected Software section.


Affected Software

Windows Server 2003

Windows Server 2003 Service Pack 2

Windows Server 2003 R2 Service Pack 2

Windows Server 2003 x64 Edition Service Pack 2

Windows Server 2003 R2 x64 Edition Service Pack 2

Windows Server 2003 with SP2 for Itanium-based Systems

Windows Vista

Windows Vista Service Pack 2

Windows Vista x64 Edition Service Pack 2

Windows Server 2008

Windows Server 2008 for 32-bit Systems Service Pack 2

Windows Server 2008 for x64-based Systems Service Pack 2

Windows Server 2008 for Itanium-based Systems Service Pack 2

Windows 7

Windows 7 for 32-bit Systems Service Pack 1

Windows 7 for x64-based Systems Service Pack 1

Windows Server 2008 R2

Windows Server 2008 R2 for x64-based Systems Service Pack 1

Windows Server 2008 R2 for Itanium-based Systems Service Pack 1

Windows 8 and Windows 8.1

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 and Windows Server 2012 R2

Windows Server 2012

Windows Server 2012 R2

Windows RT and Windows RT 8.1

Windows RT[1]

Windows RT 8.1[1]

Server Core installation option

Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core
installation)

Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core
installation)

Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core
installation)

Windows Server 2012 (Server Core installation)

Windows Server 2012 R2 (Server Core installation)


Vulnerability Information

Spoofing Vulnerability in Netlogon Vulnerability - CVE-2015-2374

A spoofing vulnerability exists in Netlogon that is caused when the
Netlogon service improperly establishes a secure communications channel
belonging to a different machine with a spoofed computer name. To
successfully exploit this vulnerability, an attacker would first have to
be logged on to a domain-joined system and be able to observe network
traffic. An attacker could then run a specially crafted application that
could establish a secure channel connection belonging to a different
computer. An attacker may be able to use the established secure channel
to obtain session-related information for the actual secure channel of
the spoofed computer.

Workstations and servers are primarily at risk from this vulnerability.
The update addresses the vulnerability by modifying the way that
Netlogon handles establishing secure channels. This update is applicable
on systems running as domain controllers. It is suggested, however, that
the update be applied to all affected platforms so that machines are
protected if they are promoted to a domain controller role in the future.

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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