[NT] Vulnerability in Macrovision Driver Allows Local Elevation of Privilege (MS07-067)

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Vulnerability in Macrovision Driver Allows Local Elevation of Privilege
(MS07-067)
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SUMMARY

This important security update resolves one publicly disclosed
vulnerability. A local elevation of privilege vulnerability exists in the
way that the Macrovision driver incorrectly handles configuration
parameters.

A local attacker who successfully exploited this vulnerability could take
control of the system. An attacker could then install programs; view,
change, or delete data; or create new accounts with full administrative
rights.

DETAILS

Affected Software:
* Windows XP Service Pack 2
* Windows XP Professional x64 Edition and Windows XP Professional x64
Edition Service Pack 2
* Windows Server 2003 Service Pack 1 and Windows Server 2003 Service Pack
2
* Windows Server 2003 x64 Edition and Windows Server 2003 x64 Edition
Service Pack 2

Non-Affected Software:
* Microsoft Windows 2000 Service Pack 4
* Windows Server 2003 for Itanium-based Systems
* Windows Vista
* Windows Vista x64 Edition

Macrovision Driver Vulnerability - CVE-2007-5587:
A local elevation of privilege vulnerability exists in the way that the
Macrovision driver incorrectly handles configuration parameters. An
attacker who successfully exploited this vulnerability could execute
arbitrary code in the context of local system. An attacker could then
install programs; view, change, or delete data; or create new accounts
with full administrative rights.

To view this vulnerability as a standard entry in the Common
Vulnerabilities and Exposures list, see
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5587>
CVE-2007-5587.

Mitigating Factors for Macrovision Driver Vulnerability - CVE-2007-5587:
Mitigation refers to a setting, common configuration, or general
best-practice, existing in a default state, that could reduce the severity
of exploitation of a vulnerability. The following mitigating factors may
be helpful in your situation:

* An attacker must convince a user to run an executable or must have
valid logon credentials to exploit this vulnerability. This is a local
elevation of privilege vulnerability. The exploit for this vulnerability
can not be done remotely.

* Microsoft Windows 2000 Service Pack 4 is not affected.

* Windows Vista is not affected.

Workarounds for Macrovision Driver Vulnerability - CVE-2007-5587:
Workaround refers to a setting or configuration change that does not
correct the underlying vulnerability but would help block known attack
vectors before you apply the update. Microsoft has tested the following
workarounds and states in the discussion whether a workaround reduces
functionality:

* Disable the secdrv.sys driver

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.

* Interactive

1. Click Start, click Run, type regedit and then click OK.
2. Expand HKEY_LOCAL_MACHINE.
3. Expand SYSTEM, expand CurrentControlSet, and then expand Services.
4. Click Secdrv.
5. Click the File menu and select Export.
6. To backup the registry before your edit it, left click on File menu,
select Export... In the Export Registry File dialog box, type
Secdrv_configuration_backup.reg and select Save.
7. Double-click the value named Start, and change the Value data: field to
4.
8. Click OK.
9. Click Start, click All Programs, click Accessories, and click Command
Prompt.
10. Run the following command at a command prompt:
Sc stop secdrv

* Managed Deployment Script

1. Make a backup copy of the registry keys from a managed deployment
script using the following command:
regedit /e Secdrv_configuration_backup.reg
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Secdrv

2. Save the following to a file with a .REG extension (e.g.
Disable_Secdrv.reg):
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Secdrv]
"Start"=dword:00000004

3. Run the registry script created in Step 2 on the target machine with
the following command:
Regedit /s Disable_Secdrv.reg

4. Click Start, click All Programs, click Accessories, and click Command
Prompt.
5. Run the following command at a command prompt:
sc stop secdrv

Impact of workaround. Programs that require this driver will not run.

FAQ for Macrovision Driver Vulnerability - CVE-2007-5587:
What is the scope of the vulnerability?
This is a local elevation of privilege vulnerability. An attacker who
successfully exploited this vulnerability could execute arbitrary code in
the context of local system. An attacker could then install programs;
view, change, or delete data; or create new accounts with full
administrative rights.

What causes the vulnerability?
The Macrovision driver incorrectly handles configuration parameters.

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 might an attacker use the vulnerability to do?
A local attacker could successfully exploit this vulnerability to gain
full control of an affected system.

How could an attacker exploit the vulnerability?
To exploit this vulnerability, the attacker must have valid credentials to
log on to the system, which would allow the attacker to run a specially
crafted application that could exploit the vulnerability and gain full
control of the affected system.

Does the update offered by Macrovision address the same vulnerability?
Version 4.3.86.0 of secdrv.sys driver is offered by Macrovision and
Microsoft for all affected versions of Windows. Only build times differ
between the Macrovision and Microsoft updates for the secdrv.sys driver.

What systems are primarily at risk from the vulnerability?
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.

When this security bulletin was issued, had this vulnerability been
publicly disclosed?
Yes. This vulnerability had been publicly disclosed when this security
bulletin was originally issued. It has been assigned the Common
Vulnerability and Exposure number
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5587>
CVE-2007-5587. This vulnerability was first described in Microsoft
Security Advisory 944653.

When this security bulletin was issued, had Microsoft received any reports
that this vulnerability was being exploited?
Yes. When the security bulletin was released, Microsoft had received
information that this vulnerability was being exploited.

ADDITIONAL INFORMATION

The information has been provided by Microsoft Security Bulletin MS07-067.
The original article can be found at:
<http://www.microsoft.com/technet/security/bulletin/ms07-067.mspx>

http://www.microsoft.com/technet/security/bulletin/ms07-067.mspx

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