CVE-2004-2329 in Personal Firewall
Summary
by MITRE
Kerio Personal Firewall (KPF) 2.1.5 allows local users to execute arbitrary code with SYSTEM privileges via the Load button in the Firewall Configuration Files option, which does not drop privileges before opening the file loading dialog box.
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Analysis
by VulDB Data Team • 04/26/2025
Kerio Personal Firewall version 2.1.5 contains a critical privilege escalation vulnerability that allows local attackers to execute arbitrary code with SYSTEM privileges. This vulnerability exists within the firewall configuration file handling mechanism where the application fails to properly drop privileges before invoking the file loading dialog box. The flaw specifically manifests when users interact with the Load button in the Firewall Configuration Files option, creating an exploitable condition that bypasses normal security boundaries.
The technical implementation of this vulnerability stems from improper privilege management within the application's code execution flow. When the Load button is activated, the system does not perform privilege separation before opening the file dialog, allowing the process to maintain elevated privileges during file operations. This design flaw enables attackers to manipulate the file loading process through malicious configuration files, potentially executing arbitrary code with the highest system privileges available. The vulnerability directly maps to CWE-276, which addresses improper privilege management in software systems, and represents a classic example of privilege escalation through improper access control mechanisms.
The operational impact of this vulnerability is severe as it provides local attackers with complete system compromise capabilities. Once exploited, the attacker gains SYSTEM-level privileges, which means they can modify system files, install malware, access all user data, and potentially establish persistent backdoors. The vulnerability affects any local user who has access to the Kerio Personal Firewall application, making it particularly dangerous in multi-user environments or when users have legitimate access to the system. This type of vulnerability is categorized under ATT&CK technique T1068, which focuses on local privilege escalation through application misconfiguration.
Mitigation strategies for this vulnerability should focus on immediate privilege management improvements within the application code. The most effective solution involves implementing proper privilege dropping mechanisms before any file operations are initiated, ensuring that the application operates with minimal required privileges during file handling processes. System administrators should consider applying vendor patches if available, though this specific vulnerability is from 2004 when the software was likely discontinued. Organizations should also implement network segmentation and access controls to limit local user access to critical system components, while monitoring for unauthorized file modifications that might indicate exploitation attempts. Additionally, regular security audits of legacy applications and proper privilege management practices should be enforced across all system components to prevent similar vulnerabilities from emerging in modern software implementations.