CVE-2011-2009 in Windows Media Center TV Pack
Summary
by MITRE
Untrusted search path vulnerability in Windows Media Center in Microsoft Windows Vista SP2 and Windows 7 Gold and SP1, and Windows Media Center TV Pack for Windows Vista, allows local users to gain privileges via a Trojan horse DLL in the current working directory, aka "Media Center Insecure Library Loading Vulnerability."
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Analysis
by VulDB Data Team • 01/12/2025
The vulnerability identified as CVE-2011-2009 represents a critical untrusted search path issue within Windows Media Center functionality across multiple Microsoft Windows operating systems including Vista SP2, Windows 7 Gold and SP1, and the Windows Media Center TV Pack for Vista. This flaw stems from improper handling of dynamic link library loading sequences where the system fails to validate the authenticity and origin of loaded libraries, creating an avenue for privilege escalation attacks. The vulnerability specifically affects the media center component that processes multimedia content and handles external library dependencies during normal operation.
The technical implementation of this vulnerability resides in the insecure library loading mechanism where Windows Media Center applications search for required dynamic link libraries in a predictable order that includes the current working directory. When a malicious actor places a specially crafted Trojan horse DLL file in the same directory as a legitimate media center executable or component, the system will load this malicious library instead of the intended legitimate one. This behavior directly aligns with CWE-427 Uncontrolled Search Path Element, which describes how applications search for libraries in a manner that can be manipulated by attackers. The flaw essentially allows attackers to execute arbitrary code with the privileges of the target process, typically resulting in elevated system access.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass broader security implications within media center environments. Local users who can write to the current working directory of a media center process can leverage this weakness to execute malicious code with elevated privileges, potentially allowing full system compromise. Attackers might exploit this by placing malicious DLLs in directories where media center applications are launched, such as shared network drives, removable media, or user-accessible locations. The vulnerability is particularly concerning because Windows Media Center often runs with elevated privileges and may be accessed by users with standard accounts, creating a path for lateral movement and persistent access within compromised systems.
Mitigation strategies for CVE-2011-2009 should focus on both immediate defensive measures and long-term architectural improvements. System administrators should implement strict file permissions and directory access controls to prevent unauthorized DLL placement in media center execution paths. The principle of least privilege should be enforced by ensuring media center applications run with minimal required permissions rather than elevated privileges. Microsoft addressed this vulnerability through security updates that modified the library loading behavior to prioritize system directories over user-controllable locations. Organizations should also implement application whitelisting policies that restrict which DLLs can be loaded by media center applications, aligning with defense-in-depth principles. Additionally, regular security assessments should verify that no unnecessary libraries are loaded from user-accessible directories, and network segmentation should be employed to limit potential attack vectors. This vulnerability demonstrates the importance of secure coding practices and proper library loading mechanisms as outlined in the ATT&CK framework's privilege escalation techniques, particularly focusing on the use of legitimate system tools for malicious purposes.