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AUSCERT External Security Bulletin Redistribution
ESB-2015.2800
Microsoft Security Bulletin MS15-119 Important: Security Update in Winsock
to Address Elevation of Privilege (3104521)
11 November 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-2015-2478
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS15-119
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Microsoft Security Bulletin MS15-119 Important: Security Update in Winsock to
Address Elevation of Privilege (3104521)
Document Metadata
Bulletin Number: MS15-119
Bulletin Title: Security Update in Winsock to Address Elevation of Privilege
Severity: Important
KB Article: 3104521
Version: 1.0
Published Date: November 10, 2015
Executive Summary
This security update resolves a vulnerability in Microsoft Windows. The
vulnerability could allow elevation of privilege if an attacker logs on to a
target system and runs specially crafted code that is designed to exploit the
vulnerability.
This security update is rated Important for all supported releases of
Microsoft Windows. For more information, see the Affected Software section.
Affected Software
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[1]
Windows RT 8.1[1]
Windows 10 for 32-bit Systems[2]
Windows 10 for x64-based Systems[2]
Windows 10 Version 1511 for 32-bit Systems
Windows 10 Version 1511 for x64-based Systems
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]This update is only available via Windows Update.
[2]Windows 10 updates are cumulative. In addition to containing non-security
updates, they also contain all of the security fixes for all of the Windows
10-affected vulnerabilities shipping with the monthly security release. The
updates are available via the Microsoft Update Catalog.
Vulnerability Information
Winsock Elevation of Privilege Vulnerability - CVE-2015-2478
An elevation of privilege vulnerability exists in Microsoft Windows when
Winsock makes a call to a memory address without verifying that the address is
valid. An attacker who successfully exploited this vulnerability could execute
code with higher permissions than are allowed by their privilege level.
To exploit the vulnerability an attacker would first have to log on to the
target system and then run specially crafted code that is designed to elevate
their privileges. The update addresses the vulnerability by preventing Winsock
from accessing invalid memory addresses.
Microsoft received information about this vulnerability through coordinated
vulnerability disclosure. At the time this security bulletin was originally
issued, Microsoft was unaware of any attack attempting to exploit this
vulnerability.
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