CVE-2012-1666 in Workstation
Summary
by MITRE
Untrusted search path vulnerability in VMware Tools in VMware Workstation before 8.0.4, VMware Player before 4.0.4, VMware Fusion before 4.1.2, VMware View before 5.1, and VMware ESX 4.1 before U3 and 5.0 before P03 allows local users to gain privileges via a Trojan horse tpfc.dll file in the current working directory.
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Analysis
by VulDB Data Team • 08/16/2025
This vulnerability represents a classic untrusted search path issue that has significant implications for system security within virtualized environments. The flaw exists in VMware Tools across multiple VMware products including Workstation, Player, Fusion, View, and ESX platforms. The vulnerability stems from the improper handling of dynamic link library loading mechanisms where the system searches for required libraries in the current working directory before examining system paths. This behavior creates an opportunity for privilege escalation attacks when malicious actors place specially crafted dll files in directories where VMware processes execute.
The technical implementation of this vulnerability exploits the Windows dynamic linking mechanism where the system loads libraries from the current working directory before checking system directories. When VMware Tools processes execute and encounter a dependency on tpfc.dll, they will first look in the current working directory rather than the proper system locations. This design flaw allows local attackers to place a malicious tpfc.dll file in the directory from which VMware processes are launched, causing the system to load and execute the attacker-controlled code with the privileges of the VMware process. This particular vulnerability affects versions prior to specific patches, with VMware releasing updates to address the issue in versions 8.0.4, 4.0.4, 4.1.2, 5.1, ESX 4.1 U3, and 5.0 P03.
The operational impact of this vulnerability extends beyond simple privilege escalation to potentially compromise entire virtualized environments. Attackers can leverage this weakness to execute arbitrary code with elevated privileges, potentially gaining access to sensitive virtual machine data, system resources, or even compromising the host system. This vulnerability particularly affects environments where users have local access to systems running VMware products, making it a significant concern for enterprise environments with shared systems or untrusted local users. The vulnerability aligns with CWE-427 Uncontrolled Search Path Element, which specifically addresses the issue of programs searching in untrusted directories for required libraries. Additionally, this vulnerability maps to ATT&CK technique T1068, which covers local privilege escalation through the exploitation of system-level vulnerabilities.
Mitigation strategies for this vulnerability require a multi-layered approach that includes immediate patching of affected VMware products to the latest versions containing the security fixes. Organizations should implement strict directory permissions and access controls to prevent unauthorized users from placing files in directories where VMware processes execute. The principle of least privilege should be enforced by running VMware processes with minimal required permissions and avoiding execution from user-writable directories. Network segmentation and monitoring should be implemented to detect suspicious file placement activities. Regular security audits should verify that no malicious dll files exist in system directories, and system integrity checks should be performed to ensure that only legitimate VMware-provided libraries are loaded. Organizations should also consider implementing application whitelisting policies to prevent execution of unauthorized dynamic link libraries, which would provide additional protection against similar search path vulnerabilities.