CVE-2010-5218 in Dupehunter
Summary
by MITRE
Untrusted search path vulnerability in Dupehunter 9.0.0.3911 allows local users to gain privileges via a Trojan horse Fwpuclnt.dll file in the current working directory, as demonstrated by a directory that contains a .dhjb file. NOTE: some of these details are obtained from third party information.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 02/20/2019
The vulnerability identified as CVE-2010-5218 represents a critical untrusted search path issue affecting Dupehunter version 9.0.0.3911, classified under CWE-427 Untrusted Search Path. This flaw exploits the software's improper handling of dynamic library loading mechanisms, creating a privilege escalation vector that can be leveraged by local attackers. The vulnerability specifically manifests when the application searches for required libraries in the current working directory without proper validation of the library's authenticity or source, allowing malicious actors to place crafted DLL files that will be executed with elevated privileges.
The technical exploitation of this vulnerability relies on the principle of dynamic link library hijacking, where an attacker places a malicious Fwpuclnt.dll file in the same directory as a legitimate Dupehunter process or in the current working directory when the application is executed. The attack is demonstrated through the use of a .dhjb file which serves as a trigger mechanism, causing the application to traverse the search path and load the malicious DLL instead of the legitimate system library. This behavior aligns with ATT&CK technique T1036.005 Obfuscated Files or Information and T1546.008 System Binary Proxy Execution, as the legitimate application becomes a vehicle for executing malicious code.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with a persistent foothold within the system. When the malicious DLL executes, it operates with the same privileges as the Dupehunter process, potentially enabling access to sensitive system resources, data exfiltration, or further lateral movement within the network. The vulnerability affects local users specifically, meaning that an attacker must already have access to the system to exploit it, but the privilege escalation aspect makes the attack particularly dangerous. This weakness creates a significant risk for environments where local access is not properly restricted or where users may have elevated privileges.
Mitigation strategies for CVE-2010-5218 should focus on both immediate remediation and long-term architectural improvements. The most direct approach involves applying vendor patches or updates that correct the search path handling behavior in Dupehunter, ensuring that the application loads libraries from trusted system directories only. System administrators should implement proper file access controls and audit the current working directory permissions for the Dupehunter application. Additionally, implementing application whitelisting solutions such as Windows AppLocker or similar technologies can prevent unauthorized DLL loading. The vulnerability highlights the importance of secure coding practices and proper library loading mechanisms, particularly in applications that handle user-provided files or operate with elevated privileges. Organizations should also consider implementing monitoring solutions that can detect suspicious DLL loading activities or unauthorized file placements in application directories. The incident underscores the necessity of following security best practices such as those outlined in the OWASP Secure Coding Practices and the CERT/CC Secure Coding Standards, particularly regarding library loading and path resolution vulnerabilities.