CVE-2003-0641 in Serverlock
Summary
by MITRE
WatchGuard ServerLock for Windows 2000 before SL 2.0.3 allows local users to load arbitrary modules via the OpenProcess() function, as demonstrated using (1) a DLL injection attack, (2) ZwSetSystemInformation, and (3) API hooking in OpenProcess.
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Analysis
by VulDB Data Team • 06/15/2018
The vulnerability identified as CVE-2003-0641 affects WatchGuard ServerLock for Windows 2000 versions prior to SL 2.0.3, representing a critical security flaw that enables local users to execute arbitrary code through improper privilege handling within the Windows operating system. This vulnerability specifically targets the OpenProcess() function, which is a fundamental Windows API call used for accessing and manipulating running processes. The flaw allows malicious actors with local access to escalate their privileges and inject malicious code into system processes, creating a significant attack surface that could be exploited for system compromise.
The technical implementation of this vulnerability involves three distinct attack vectors that demonstrate the breadth of exploitation possibilities. The first vector utilizes DLL injection attacks where malicious code is loaded into the address space of legitimate processes through the OpenProcess() function. The second vector leverages ZwSetSystemInformation, a Windows kernel-level API that can modify system configuration and potentially manipulate process execution flows. The third vector employs API hooking techniques within OpenProcess, where attackers can intercept and redirect function calls to execute malicious code instead of legitimate system operations. This multi-vector approach demonstrates the comprehensive nature of the vulnerability and the various methods attackers can employ to exploit the flawed privilege handling.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with persistent access to system resources and the ability to execute arbitrary commands with elevated privileges. Local users who exploit this vulnerability can effectively bypass the normal security boundaries that protect system processes, potentially gaining access to sensitive data, modifying system configurations, or establishing backdoors for continued unauthorized access. The vulnerability particularly affects Windows 2000 environments where ServerLock is deployed as a security solution, creating a paradoxical situation where the security tool itself becomes a potential attack vector.
From a cybersecurity perspective, this vulnerability aligns with CWE-264, which describes permissions, privileges, and access control issues, and demonstrates how improper privilege management can lead to system compromise. The attack vectors also relate to ATT&CK techniques such as privilege escalation and persistence, where adversaries can maintain long-term access to compromised systems. The vulnerability's exploitation requires local system access, making it particularly concerning in environments where physical or network access is not properly controlled, as it can serve as a stepping stone for more extensive attacks. Organizations implementing WatchGuard ServerLock should consider this vulnerability as part of their overall security posture assessment and implement appropriate mitigations including system hardening, access controls, and regular security updates.
The exploitation of this vulnerability highlights the importance of proper input validation and privilege separation in system APIs. The OpenProcess() function should properly validate the requesting process's privileges before allowing access to other processes, and the system should implement robust checks to prevent unauthorized module loading. This vulnerability also demonstrates the need for comprehensive security testing of security tools themselves, as they often become targets for attackers seeking to exploit their own implementations. Organizations should implement monitoring solutions that can detect anomalous process behavior and unauthorized module loading attempts, particularly in environments where security tools like WatchGuard ServerLock are deployed. The vulnerability's resolution requires updating to ServerLock version 2.0.3 or later, which includes proper privilege validation and module loading restrictions that prevent the exploitation techniques described in the attack vectors.