[NT] Microsoft License Manager and urlmon.dll COM Object Interaction Invalid Memory Access Vulnerability

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Microsoft License Manager and urlmon.dll COM Object Interaction Invalid
Memory Access Vulnerability
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SUMMARY

Internet Explorer is "a set of core technologies in Microsoft Windows
operating systems that provide web browsing functionality". Remote
exploitation of an invalid memory access vulnerability in various
Microsoft products, including Internet Explorer, while creating certain
COM objects may allow an attacker to execute arbitrary code.

DETAILS

When creating certain COM objects in Internet Explorer, memory corruption
can occur, which may allow an attacker to execute arbitrary code. When
calling the IObjectSafety function, uninitialized memory is accessed in a
way that can allow code execution to occur. The IObjectSafety function is
used by COM objects to determine if an object is safe to load in a
particular context.

Analysis:
Exploitation of this vulnerability could allow a remote attacker to
execute arbitrary code in the context of the currently logged in user.

One method of exploiting this vulnerability would be to craft a website
that performs the required operations. It also may be possible to embed
the controls in an Office document.

iDefense Labs successfully constructed exploit code for this vulnerability
that causes code execution, although not in a reliable
manner. It may be possible to increase the reliability using other
techniques.

Detection:
iDefense confirmed the existence of this vulnerability using Internet
Explorer 6 on Windows XP SP2 and Windows Server 2000 SP4. Although Windows
Server 2003 contains an affected version, the Enhanced Security
Configuration mitigates exposure to this vulnerability.

Microsoft reports that Internet Explorer 7 is not affected.

Other applications that can load COM objects from documents may also be
affected.

Workaround:
Setting the kill-bits for the CLSIDs associated with urlmon.dll will
prevent them from loading as ActiveX controls. While disabling the ability
to create these controls from a Web page did not appear to cause any
change in behavior, some sites or applications may exhibit changes in
functionality.

Vendor response:
Microsoft has addressed this vulnerability within MS07-033. For more
information, consult their bulletin at the following URL.
<http://www.microsoft.com/technet/security/Bulletin/MS07-033.mspx>

http://www.microsoft.com/technet/security/Bulletin/MS07-033.mspx

CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-0218>
CVE-2007-0218

Disclosure Timeline:
10/24/2006 - Initial vendor notification
01/03/2007 - Initial vendor response
06/12/2007 - Coordinated public disclosure

ADDITIONAL INFORMATION

The information has been provided by
<mailto:idlabs-advisories@idefense.com> iDefense Labs Security Advisories.
The original article can be found at:
<http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=542>

http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=542

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