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Research > Zero-Day Tracker > 20110223

Microsoft Malware Protection Engine Privilege Escalation

Date Disclosed:
2/23/2011

Date Patched:
3/8/2011

Vendor:
Microsoft

Affected Software:
Malicious Software Removal Tool

Description:
Microsoft Windows Malicious Software Removal Tool contains a vulnerability when handling a specially crafted registry key. Successful exploitation could allow execution of arbitrary code in the context of the LocalSystem account.

Severity:
Moderate

Code Execution:
Yes

Impact:
Local elevation of privileges to Local System rights
Attackers exploiting this vulnerability would be seeking to gain kernel-level access to a machine. It would need to be used in combination with some other exploit to initially gain access to the system since this privilege escalation vulnerability is only locally exploitable. After exploiting the vulnerability, the attacker would have gained the ability to execute code with Kernel level privileges.

Mitigation:
Install the appropriate definition update from Microsoft or through Windows/Microsoft Update.

Protection:

  • eEye's Retina® Network Security Scanner scans devices to detect for this vulnerability.
    • Retina Audit 14258 - Microsoft Malicious Software Removal Tool Privilege Escalation (2491888)

Links:

Status:

  • 2.23.2011 - Public Information Released
  • 3.9.2011 - Vendor Patch Released

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