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ESB-2007.0871 -- [Win] -- Vulnerability in Macrovision SECDRV.SYS Driver on Windows Could Allow Elevation of Privilege

Date: 08 November 2007
References: ESB-2007.1000  

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                          ESB-2007.0871 -- [Win]
         Vulnerability in Macrovision SECDRV.SYS Driver on Windows
                    Could Allow Elevation of Privilege
                              8 November 2007

===========================================================================

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

Product:              Macrovision secdrv.sys driver
Publisher:            Microsoft
Operating System:     Windows Server 2003
                      Windows XP
Impact:               Increased Privileges
Access:               Existing Account
CVE Names:            CVE-2007-5587

Revision History:     November 8 2007: Updated the description on the 
                                       secdrv.sys driver. Added a Workaround 
                                       involving disabling the driver in the 
                                       registry.
                      November 6 2007: Initial Release

- --------------------------BEGIN INCLUDED TEXT--------------------


Microsoft Security Advisory (944653)
Vulnerability in Macrovision SECDRV.SYS Driver on Windows Could Allow 
Elevation of Privilege

- - Affected Software:

  Microsoft Windows XP Service Pack 2
  Microsoft Windows XP Professional x64 Edition
  Microsoft Windows XP Professional x64 Edition Service Pack 2
  Microsoft Windows Server 2003 Service Pack 1
  Microsoft Windows Server 2003 with SP1 for Itanium-based Systems
  Microsoft Windows Server 2003 Service Pack 2
  Microsoft Windows Server 2003 with SP2 for Itanium-based Systems
  Microsoft Windows Server 2003 x64 Edition
  Microsoft Windows Server 2003 x64 Edition Service Pack 2

- - Impact:

  Elevation of Privilege

- - From the Microsoft Security Bulletin

  Vulnerability Details

  What is secdrv.sys?
  The driver, secdrv.sys, is used by games which use Macrovision SafeDisc. 
  The driver validates the authenticity of games that are protected with 
  SafeDisc and prohibits unauthorized copies of such games to play on 
  Windows. The secdrv.sys is included with Microsoft Windows XP, Windows 
  Server 2003 and Windows Vista to increase compatibility of the games 
  on Windows. Without the driver, games with SafeDisc protection would be 
  unable to play on Windows. SafeDisc remains inactive until invoked by a 
  game for authorization to play on Windows.

  What causes this vulnerability?
  The Macrovision secdrv.sys driver on supported editions of Windows Server 
  2003 and Windows XP incorrectly handles configuration parameters.

  Recommendation: 
  Install the update offered by Macrovision for systems running supported 
  editions of Windows XP and Windows Server 2003 to help protect against 
  this vulnerability. [1]

  Workarounds
  Disable the secdrv.sys driver in the system registry

  Disabling the secdrv.sys driver in the system registry key helps protect 
  affected systems from attempts to exploit this vulnerability.

  Note: Using Registry Editor incorrectly can cause serious problems that 
  may require you to reinstall your operating system. Microsoft cannot 
  guarantee that problems resulting from the incorrect use of Registry 
  Editor can be solved. Use Registry Editor at your own risk. For 
  information about how to edit the registry, view the "Changing Keys And 
  Values" Help topic in Registry Editor (Regedit.exe) or view the "Add and 
  Delete Information in the Registry" and "Edit Registry Data" Help topics 
  in Regedt32.exe.

  Note: We recommend backing up the registry before you edit it.

  1. Click Start, click Run, type regedit and then click Continue.
  2. Expand HKEY_LOCAL_MACHINE, expand SYSTEM, expand CurrentControlSet, 
     and then expand Services.
  3. Left click on Secdrv.
  4. To backup the registry before your edit it, left click on File menu, 
     select Export... In the Export Registry File dialog type 
     Secdrv_configuration_backup.reg and select Save.
  5. Right click on Start, select Modify, and change Value date: to 4.

  Impact of Workaround: Programs that require the secdrv.sys driver will 
  not run.

  References:

  [1] Macrovision - Updating the Macrovision SECDRV.SYS Driver
      http://www.macrovision.com/promolanding/7352.htm


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Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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