CVE-2011-0029 in Windows
Summary
by MITRE
Untrusted search path vulnerability in the client in Microsoft Remote Desktop Connection 5.2, 6.0, 6.1, and 7.0 allows local users to gain privileges via a Trojan horse DLL in the current working directory, as demonstrated by a directory that contains a .rdp file, aka "Remote Desktop Insecure Library Loading Vulnerability."
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Analysis
by VulDB Data Team • 01/20/2025
The CVE-2011-0029 vulnerability represents a critical untrusted search path issue affecting Microsoft Remote Desktop Connection clients across multiple versions including 5.2, 6.0, 6.1, and 7.0. This flaw resides in the client-side component of Remote Desktop services and demonstrates a classic insecure library loading pattern that has been documented under CWE-427. The vulnerability specifically manifests when the Remote Desktop Connection client processes .rdp files, creating an opportunity for local attackers to execute malicious code with elevated privileges. The attack vector exploits the client's failure to properly validate the search path for dynamic link libraries, allowing attackers to place malicious DLLs in the current working directory where the application executes.
The technical exploitation of this vulnerability leverages the principle of least privilege violation by enabling local users to inject malicious code through a Trojan horse DLL file. When a user opens an .rdp file, the Remote Desktop Connection client searches for required libraries in the current working directory before checking system paths, creating a window for privilege escalation. This behavior aligns with ATT&CK technique T1068 which describes the exploitation of local privileges through insecure library loading mechanisms. The vulnerability essentially allows attackers to bypass normal security boundaries by placing malicious components in directories where legitimate applications expect to find supporting libraries, thereby achieving unauthorized code execution with the privileges of the target user.
The operational impact of CVE-2011-0029 extends beyond simple privilege escalation to encompass broader security implications for enterprise environments that rely on Remote Desktop services. Organizations using affected versions of Remote Desktop Connection face potential compromise of user sessions and system integrity, as attackers can leverage this vulnerability to establish persistent access or escalate privileges to administrative levels. The vulnerability's prevalence across multiple versions of the Remote Desktop client means that even organizations with mixed environments could be at risk, as the flaw exists in the core client component regardless of specific version. Security administrators must consider the implications for remote work scenarios where users might inadvertently open malicious .rdp files or where attackers have access to user workstations.
Mitigation strategies for CVE-2011-0029 should focus on both immediate remediation and long-term architectural improvements to prevent similar vulnerabilities. Microsoft released patches addressing this issue in subsequent updates, and organizations should prioritize applying these security updates across all affected systems. Additionally, implementing strict file access controls and monitoring for unusual DLL loading patterns can help detect potential exploitation attempts. Network segmentation and user access controls can limit the potential damage from successful exploitation, while security awareness training can help prevent users from inadvertently opening malicious .rdp files. The vulnerability serves as a reminder of the importance of secure coding practices and proper library loading mechanisms, particularly in applications that handle user-provided files and execute with elevated privileges. Organizations should also consider implementing application whitelisting policies to restrict which DLLs can be loaded by Remote Desktop clients, thereby reducing the attack surface for similar insecure library loading vulnerabilities.