CVE-2006-3697 in Personal Firewall
Summary
by MITRE
Agnitum Outpost Firewall Pro 3.51.759.6511 (462), as used in (1) Lavasoft Personal Firewall 1.0.543.5722 (433) and (2) Novell BorderManager Novell Client Firewall 2.0, does not properly restrict user activities in application windows that run in a LocalSystem context, which allows local users to gain privileges and execute commands (a) via the "open folder" option when no instance of explorer.exe is running, possibly related to the ShellExecute API function; or (b) by overwriting a batch file through the "Save Configuration As" option. NOTE: this might be a vulnerability in Microsoft Windows and explorer.exe instead of the firewall.
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Analysis
by VulDB Data Team • 09/18/2017
This vulnerability exists in Agnitum Outpost Firewall Pro version 3.51.759.6511 and its derivatives used in Lavasoft Personal Firewall and Novell BorderManager Novell Client Firewall. The flaw represents a privilege escalation issue that allows local users to execute arbitrary commands with elevated privileges. The vulnerability stems from improper handling of user activities within application windows that operate under the LocalSystem context, which is the highest privilege level available in Windows operating systems. This creates a dangerous scenario where standard user privileges can be escalated to system-level access through carefully crafted interactions with the firewall's graphical interface.
The technical implementation of this vulnerability involves two primary attack vectors that exploit the interaction between the firewall application and Windows system components. The first vector occurs when users access the "open folder" functionality while no instance of explorer.exe is running, potentially leveraging the ShellExecute API function to execute commands with elevated privileges. The second vector involves exploiting the "Save Configuration As" option to overwrite batch files, which can then be executed with system privileges when the firewall application runs with LocalSystem context. Both attack paths demonstrate a fundamental flaw in how the firewall application manages file operations and user interactions within privileged contexts, creating opportunities for malicious code execution.
The operational impact of this vulnerability is significant as it enables local attackers to bypass security controls and execute arbitrary commands with system-level privileges. This creates a persistent threat vector where malicious users can install backdoors, modify system configurations, or access sensitive data without detection. The vulnerability affects not only the specific firewall implementations mentioned but potentially other applications that share similar architectural patterns in handling LocalSystem context operations. The fact that this might be related to Microsoft Windows and explorer.exe components suggests broader implications for the Windows security model, particularly regarding how applications interact with system-level processes and file operations. The vulnerability's exploitation requires local access but can result in complete system compromise, making it a critical concern for enterprise security.
Mitigation strategies should focus on restricting local user privileges and implementing proper access controls for firewall configuration interfaces. Organizations should ensure that firewall applications are running with the minimum required privileges rather than LocalSystem context when possible. The use of application whitelisting and mandatory access controls can help prevent unauthorized file modifications and command execution. Regular security updates and patches should be applied to firewall applications, while monitoring for unusual file system activities or command executions can help detect exploitation attempts. System administrators should also consider implementing additional security layers such as Windows Defender Application Control or similar technologies to prevent unauthorized code execution. This vulnerability highlights the importance of proper privilege separation and secure coding practices in security applications, aligning with CWE-276 standards for insecure file permissions and improper privilege management. The attack patterns involved relate to techniques described in the ATT&CK framework under privilege escalation and persistence tactics, emphasizing the need for comprehensive security monitoring and defense-in-depth strategies.