CVE-2016-1281 in TrueCrypt
Summary
by MITRE
Untrusted search path vulnerability in the installer for TrueCrypt 7.2 and 7.1a, VeraCrypt before 1.17-BETA, and possibly other products allows local users to execute arbitrary code with administrator privileges and conduct DLL hijacking attacks via a Trojan horse DLL in the "application directory", as demonstrated with the USP10.dll, RichEd20.dll, NTMarta.dll and SRClient.dll DLLs.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 05/14/2026
The vulnerability identified as CVE-2016-1281 represents a critical untrusted search path issue affecting popular disk encryption software including TrueCrypt 7.2 and 7.1a, as well as VerCrypt versions prior to 1.17-BETA. This flaw resides within the installer components of these encryption tools, creating a pathway for malicious actors to escalate privileges and execute arbitrary code with administrator level access. The vulnerability stems from improper handling of dynamic link library (DLL) loading mechanisms during the installation process, where the system searches for required libraries in predictable locations without adequate validation of their authenticity or source.
The technical exploitation of this vulnerability occurs through DLL hijacking techniques, where attackers place malicious DLL files in specific directories that the installer or installed application will search during execution. The attack vector is particularly dangerous because it targets the application directory, a location that typically contains legitimate software components and is often trusted by the operating system. Demonstrations of this exploit have shown successful manipulation using specific DLLs such as USP10.dll, RichEd20.dll, NTMarta.dll, and SRClient.dll, which are commonly found in Windows environments and are frequently loaded by various applications. This vulnerability directly maps to CWE-427 Uncontrolled Search Path Element, which describes situations where an application searches for libraries in predictable locations without proper validation.
The operational impact of CVE-2016-1281 is severe and multifaceted, as it enables local privilege escalation attacks that can compromise the entire system. When a local user places a malicious DLL in the targeted application directory, any subsequent execution of the vulnerable installer or application will load and execute the malicious code with the privileges of the target process, typically elevated administrator rights. This creates a persistent threat vector that can be exploited to install backdoors, steal encryption keys, or modify system files, potentially leading to complete system compromise. The vulnerability is particularly concerning because it affects widely used encryption software, meaning that successful exploitation could result in unauthorized access to sensitive encrypted data and system resources.
Mitigation strategies for this vulnerability require immediate remediation through software updates and patches provided by the vendors. Organizations should ensure that all systems running affected versions of TrueCrypt or VerCrypt are updated to the latest stable releases that address the untrusted search path issue. Additionally, system administrators should implement security measures such as restricting write permissions to application directories, monitoring for unauthorized DLL placements, and employing application whitelisting solutions to prevent execution of untrusted code. The ATT&CK framework categorizes this vulnerability under privilege escalation techniques, specifically focusing on DLL hijacking and search path manipulation tactics that adversaries use to gain elevated system access. System hardening practices including regular security audits, proper file permission controls, and network segmentation can help reduce the attack surface and limit the potential impact of such vulnerabilities in enterprise environments.