CVE-2000-0437 in WebShield
Summary
by MITRE
Buffer overflow in the CyberPatrol daemon "cyberdaemon" used in gauntlet and WebShield allows remote attackers to cause a denial of service or execute arbitrary commands.
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Analysis
by VulDB Data Team • 10/14/2025
The vulnerability identified as CVE-2000-0437 represents a critical buffer overflow flaw within the CyberPatrol daemon component known as "cyberdaemon" which was integral to the Gauntlet and WebShield security products. This daemon served as a core network monitoring and filtering service that processed incoming network traffic and applied security policies. The buffer overflow vulnerability specifically manifested in the daemon's handling of network packets, where insufficient input validation allowed attackers to craft malicious payloads that would exceed the allocated buffer space. This flaw was particularly dangerous because it existed in a privileged network service that typically ran with elevated system permissions, making the potential impact significantly more severe than typical buffer overflow vulnerabilities.
The technical nature of this vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The cyberdaemon process, running as a network service, would receive untrusted input from network connections without proper sanitization, enabling attackers to overwrite critical memory structures including return addresses and function pointers. This memory corruption could be exploited to redirect program execution flow, potentially allowing remote code execution with the privileges of the daemon process. The vulnerability was particularly concerning because the daemon typically operated with system-level privileges, meaning successful exploitation could result in complete system compromise rather than just denial of service.
From an operational perspective, this vulnerability created significant risk for organizations relying on Gauntlet and WebShield products, as it provided remote attackers with the capability to either disrupt services through denial of service conditions or gain unauthorized access to systems. The impact extended beyond immediate service disruption to potential data breaches, system infiltration, and lateral movement within network environments. Organizations using these products faced the risk of unauthorized access to sensitive network traffic filtering capabilities, potentially allowing attackers to bypass security controls or modify network traffic processing. The vulnerability's remote exploitability meant that attackers could target these systems from outside the network perimeter, eliminating the need for physical access or insider threats.
Mitigation strategies for this vulnerability required immediate patching of affected systems, as the vendor had released updates addressing the buffer overflow conditions. Network segmentation and firewall rules should have been implemented to limit access to the cyberdaemon service, while monitoring systems were essential to detect potential exploitation attempts. The implementation of input validation measures and bounds checking in network service applications became critical lessons learned from this vulnerability. Organizations should have conducted comprehensive vulnerability assessments to identify all instances of the affected daemon and ensured proper patch management procedures were in place. Additionally, the incident highlighted the importance of secure coding practices and regular security reviews of network services, particularly those operating with elevated privileges. The vulnerability also demonstrated the need for network monitoring to detect anomalous traffic patterns that might indicate exploitation attempts, while maintaining detailed logging of network service operations to facilitate forensic analysis. This case study reinforced the fundamental principle that network security services themselves must be hardened against exploitation, as they represent potential attack vectors that could be leveraged to compromise entire network infrastructures.