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AUSCERT External Security Bulletin Redistribution
ESB-2015.1285
MS15-050: Vulnerability in Service Control Manager Could
Allow Elevation of Privilege (3055642)
13 May 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft Windows
Publisher: Microsoft
Operating System: Windows
Impact/Access: Increased Privileges -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2015-1702
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS15-050
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MS15-050: Vulnerability in Service Control Manager Could Allow Elevation of
Privilege (3055642)
Bulletin Number: MS15-050
Bulletin Title: Vulnerability in Service Control Manager Could Allow Elevation
of Privilege
Severity: Important
KB Article: 3055642
Version: 1.0
Published Date: May 12, 2015
Executive Summary
This security update resolves a vulnerability in the Windows Service Control
Manager (SCM), which is caused when the SCM improperly verifies impersonation
levels. The vulnerability could allow elevation of privilege if an attacker
can first log on to the system, and then run a specially crafted application
designed to increase privileges.
This security update is rated Important for all supported editions of
Microsoft Windows. For more information, see the Affected Software section.
Affected Software
Windows Server 2003 Service Pack 2[1]
Windows Server 2003 x64 Edition Service Pack 2[1]
Windows Server 2003 with SP2 for Itanium-based Systems[1]
Windows Vista Service Pack 2
Windows Vista x64 Edition Service Pack 2
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 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for Itanium-based Systems Service Pack 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 RT[2]
Windows RT 8.1[2]
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)
[1]Windows Server 2003 is affected, but an update is not being issued for it.
See the Update FAQ for more information.
[2]This update is available via Windows Update only.
Vulnerability Information
Service Control Manager Elevation of Privilege Vulnerability - CVE-2015-1702
An elevation of privilege vulnerability exists in the Windows Service Control
Manager (SCM) when the SCM improperly verifies impersonation levels. An
attacker who successfully exploited this vulnerability could gain elevated
privileges and make calls to SCM for which they lack sufficient privilege. The
update addresses the vulnerability by correcting the way that the SCM verifies
impersonation levels.
To exploit this vulnerability, an attacker would first have to log on to the
system. An attacker could then run a specially crafted application designed to
increase privileges. Workstations and terminal servers are primarily at risk.
Servers could be at more risk if administrators allow users to log on to
servers and to run programs. However, best practices strongly discourage
allowing this to occur.
Microsoft received information about this vulnerability through coordinated
vulnerability disclosure. When this security bulletin was originally issued
Microsoft had not received any information to indicate that this vulnerability
had been publicly used to attack customers.
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