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             AUSCERT External Security Bulletin Redistribution

                               ESB-2010.1139
        Vulnerabilities in Windows Kernel-Mode Drivers Could Allow
                     Elevation of Privilege (2436673)
                             15 December 2010

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Microsoft Windows
Publisher:         Microsoft
Operating System:  Windows XP
                   Windows Vista
                   Windows 7
                   Windows Server 2003
                   Windows Server 2008
Impact/Access:     Administrator Compromise -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2010-3944 CVE-2010-3943 CVE-2010-3942
                   CVE-2010-3941 CVE-2010-3940 CVE-2010-3939

Original Bulletin: 
   http://www.microsoft.com/technet/security/Bulletin/MS10-098.mspx

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Microsoft Security Bulletin MS10-098 - Important

Vulnerabilities in Windows Kernel-Mode Drivers Could Allow Elevation of 
Privilege (2436673)

Version: 1.0

General Information

Executive Summary

  This security update resolves one publicly disclosed vulnerability and 
  several privately reported vulnerabilities in Microsoft Windows. The
  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 all supported versions of 
  Microsoft Windows. For more information, see the subsection, Affected and 
  Non-Affected Software, in this section.

  The security update addresses the vulnerabilities by correcting the way the 
  Windows kernel-mode drivers allocate memory, free objects that are no longer 
  in use, manage kernel-mode driver objects, and validate input passed from
  user  mode. For more information about the vulnerabilities, see the
  Frequently Asked Questions (FAQ) subsection for the specific vulnerability
  entry under the next section, Vulnerability Information.

Affected Software

  Windows XP Service Pack 3
  Windows XP Professional x64 Edition Service Pack 2
  Windows Server 2003 Service Pack 2
  Windows Server 2003 x64 Edition Service Pack 2
  Windows Server 2003 with SP2 for Itanium-based Systems
  Windows Vista Service Pack 1
  Windows Vista Service Pack 2
  Windows Vista x64 Edition Service Pack 1
  Windows Vista x64 Edition Service Pack 2
  Windows Server 2008 for 32-bit Systems*
  Windows Server 2008 for 32-bit Systems Service Pack 2*
  Windows Server 2008 for x64-based Systems*
  Windows Server 2008 for x64-based Systems Service Pack 2*
  Windows Server 2008 for Itanium-based Systems
  Windows Server 2008 for Itanium-based Systems Service Pack 2
  Windows 7 for 32-bit Systems
  Windows 7 for x64-based Systems
  Windows Server 2008 R2 for x64-based Systems*
  Windows Server 2008 R2 for Itanium-based Systems

   *Server Core installation affected.

Vulnerability Information

Win32k Buffer Overflow Vulnerability - CVE-2010-3939

  An elevation of privilege vulnerability exists in the way that Windows 
  kernel-mode drivers improperly allocate memory when copying data from user 
  mode. An attacker who successfully exploited this vulnerability 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.

Win32k PFE Pointer Double Free Vulnerability - CVE-2010-3940

  An elevation of privilege vulnerability exists due to the way that the Windows
  kernel-mode drivers free objects that are no longer in use. An attacker who 
  successfully exploited this vulnerability 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.

Win32k Double Free Vulnerability - CVE-2010-3941

  An elevation of privilege vulnerability exists due to the way that the Windows
  kernel-mode drivers free objects that are no longer in use. An attacker who 
  successfully exploited this vulnerability 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.

Win32k WriteAV Vulnerability - CVE-2010-3942

  An elevation of privilege vulnerability exists in the way that Windows 
  kernel-mode drivers improperly allocate memory when copying data from user 
  mode. An attacker who successfully exploited this vulnerability 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.

Win32k Cursor Linking Vulnerability- CVE-2010-3943

  An elevation of privilege vulnerability exists due to the way that Windows 
  Kernel-mode drivers manage kernel-mode driver objects. An attacker who 
  successfully exploited this vulnerability 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.

Win32k Memory Corruption Vulnerability - CVE-2010-3944

  An elevation of privilege vulnerability exists in the way that the Windows 
  kernel-mode drivers improperly validate input passed from user mode. An 
  attacker who successfully exploited this vulnerability 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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