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             AUSCERT External Security Bulletin Redistribution

        Vulnerabilities in Windows Kernel Could Allow Elevation of
                            Privilege (2859537)
                              13 August 2013


        AusCERT Security Bulletin Summary

Product:           Microsoft Windows
Publisher:         Microsoft
Operating System:  Windows
Impact/Access:     Administrator Compromise -- Existing Account
                   Reduced Security         -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2013-2556  

Original Bulletin: 

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Microsoft Security Bulletin MS13-063 - Important

Vulnerabilities in Windows Kernel Could Allow Elevation of Privilege (2859537)

Published Date: August 13, 2013

Version: 1.0

General Information

Executive Summary

This security update resolves one publicly disclosed vulnerability and three 
privately reported vulnerabilities in Microsoft Windows. The most severe 
vulnerabilities could allow elevation of privilege if an attacker logged on 
locally and ran a specially crafted application. An attacker must have valid 
logon credentials and be able to log on locally to exploit these 
vulnerabilities. The vulnerabilities could not be exploited remotely or by 
anonymous users.

This security update is rated Important for supported 32-bit editions of
Windows XP, Windows Server 2003, and Windows 8; and all supported editions of
Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2. 

Affected Software

Windows XP Service Pack 3 (2859537)

Windows Server 2003 Service Pack 2 (2859537)

Windows Vista Service Pack 2 (2859537)
Windows Vista x64 Edition Service Pack 2 (2859537)

Windows Server 2008 for 32-bit Systems Service Pack 2 (2859537)
Windows Server 2008 for x64-based Systems Service Pack 2 (2859537)
Windows Server 2008 for Itanium-based Systems Service Pack 2 (2859537)

Windows 7 for 32-bit Systems Service Pack 1 (2859537)
Windows 7 for x64-based Systems Service Pack 1 (2859537)

Windows Server 2008 R2 for x64-based Systems Service Pack 1 (2859537)
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1 (2859537)

Windows 8 for 32-bit Systems(2859537)

Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core 
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core 
installation) (2859537)
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core 
installation) (2859537)

Vulnerability Information

ASLR Security Feature Bypass Vulnerability - CVE-2013-2556

A security feature vulnerability exists in Windows due to improper 
implementation of Address Space Layout Randomization (ASLR). The vulnerability 
could allow an attacker to bypass the ASLR security feature, most likely during
or in the course of exploiting a remote code execution vulnerability. The 
attacker could then load a DLL in the process.

Windows Kernel Memory Corruption Vulnerabilities 

Elevation of privilege vulnerabilities exist in the Windows kernel due to a 
memory corruption condition in the NT Virtual DOS Machine (NTVDM). An attacker 
who successfully exploited these vulnerabilities could run arbitrary code in
kernel mode. An attacker could then install programs; view, change, or delete 
data; or create new accounts with full user rights.

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