CVE-2001-1457 in CrazyWWWBoard
Summary
by MITRE
Buffer overflow in CrazyWWWBoard 2000p4 and 2000LEp5 allows remote attackers to execute arbitrary code via a long HTTP_USER_AGENT CGI environment variable.
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Analysis
by VulDB Data Team • 11/17/2024
The vulnerability identified as CVE-2001-1457 represents a critical buffer overflow flaw in CrazyWWWBoard versions 2000p4 and 2000LEp5, which are web-based bulletin board systems designed for internet communication. This vulnerability resides within the handling of HTTP_USER_AGENT environment variables through CGI scripts, creating a pathway for remote code execution that could be exploited by malicious actors without requiring authentication or prior access to the system. The flaw demonstrates a classic security weakness where input validation fails to properly constrain data length, allowing attackers to overwrite memory segments beyond intended boundaries.
The technical implementation of this vulnerability stems from improper bounds checking within the CGI script processing the USER_AGENT header. When a maliciously crafted HTTP request containing an excessively long USER_AGENT string is sent to the vulnerable web server, the application fails to validate the input length before copying it into a fixed-size buffer. This buffer overflow condition enables attackers to overwrite adjacent memory locations, potentially including return addresses, function pointers, or other critical program state information. The vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows memory corruption through buffer overflows.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with complete control over the affected web server. Successful exploitation could result in unauthorized access to sensitive data, system compromise, and potential lateral movement within network environments. Attackers could leverage this vulnerability to install backdoors, modify web content, steal user credentials, or use the compromised server as a staging point for further attacks. The remote nature of the exploit means that attackers do not require physical access to the system, making this vulnerability particularly dangerous for publicly accessible web applications.
Security professionals should implement immediate mitigations including applying vendor patches, implementing input validation controls, and deploying web application firewalls to filter malicious USER_AGENT strings. The vulnerability demonstrates the importance of input sanitization and proper memory management practices in web applications. Organizations should follow ATT&CK framework techniques related to T1059 for remote code execution and T1071 for application layer protocol usage to detect and prevent exploitation attempts. Additionally, system administrators should conduct thorough vulnerability assessments to identify other potentially vulnerable applications and implement comprehensive monitoring to detect anomalous USER_AGENT patterns that may indicate exploitation attempts. The incident underscores the critical need for robust software development practices and regular security updates to prevent such fundamental flaws from being exploited in production environments.