CVE-2002-0550 in Dynamic Guestbook
Summary
by MITRE
Dynamic Guestbook 3.0 allows remote attackers to execute arbitrary code via shell metacharacters in the gbdaten parameter.
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Analysis
by VulDB Data Team • 09/16/2025
The vulnerability identified as CVE-2002-0550 affects Dynamic Guestbook version 3.0, a web-based guestbook application that was commonly used for collecting visitor feedback on websites. This particular flaw represents a critical security weakness that allows remote attackers to execute arbitrary code on the affected system, potentially leading to complete system compromise. The vulnerability stems from insufficient input validation and sanitization within the application's parameter handling mechanisms, specifically in how the gbdaten parameter is processed. This type of vulnerability falls under the category of command injection attacks, where attacker-controlled input is directly incorporated into system commands without proper sanitization.
The technical implementation of this vulnerability occurs when the gbdaten parameter is passed to the application without adequate validation or sanitization of special shell metacharacters. When these metacharacters are present in the parameter, they can be interpreted by the underlying operating system shell, allowing attackers to execute arbitrary commands with the privileges of the web server process. The flaw is particularly dangerous because it enables attackers to bypass normal authentication mechanisms and directly interact with the system's command execution layer. This vulnerability is classified as a command injection issue under CWE-77 and aligns with the ATT&CK technique T1059.001 for Command and Scripting Interpreter, specifically targeting the execution of system commands through web interfaces.
The operational impact of this vulnerability extends beyond simple code execution to encompass full system compromise and potential data exfiltration. Attackers can leverage this vulnerability to establish persistent access, install backdoors, modify or delete sensitive data, and potentially use the compromised system as a launch point for further attacks within the network. The vulnerability affects any system running Dynamic Guestbook 3.0 where the gbdaten parameter is processed without proper input validation, making it particularly dangerous in shared hosting environments or multi-tenant systems where multiple applications share the same infrastructure. Organizations with web applications that rely on user input for processing commands are at significant risk, as this vulnerability demonstrates the critical importance of proper input validation and sanitization practices.
Mitigation strategies for this vulnerability require immediate action including applying the vendor-provided patch or upgrade to a secure version of Dynamic Guestbook that properly validates and sanitizes input parameters. System administrators should implement input validation at multiple layers including web application firewalls, server-side validation, and proper output encoding to prevent metacharacter interpretation. Network segmentation and privilege separation can help limit the impact if exploitation occurs, while regular security audits and penetration testing should be conducted to identify similar vulnerabilities in other applications. The remediation process should also include monitoring for suspicious activities and implementing proper logging mechanisms to detect potential exploitation attempts. Organizations should consider implementing the principle of least privilege for web applications and regularly review and update their security configurations to prevent similar command injection vulnerabilities from being introduced in future web applications.