CVE-2000-0002 in ZBServer
Summary
by MITRE
Buffer overflow in ZBServer Pro 1.50 allows remote attackers to execute commands via a long GET request.
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Analysis
by VulDB Data Team • 10/20/2025
The vulnerability identified as CVE-2000-0002 represents a critical buffer overflow flaw discovered in ZBServer Pro version 1.50, a web server application that was widely used in the late 1990s and early 2000s. This vulnerability resides within the server's handling of HTTP GET requests, specifically when processing excessively long parameter strings. The flaw manifests when the server fails to properly validate input length before copying data into fixed-size memory buffers, creating a condition where maliciously crafted requests can overwrite adjacent memory locations. This type of vulnerability falls under CWE-121, which categorizes buffer overflow conditions as a fundamental weakness in software design that allows attackers to manipulate memory contents.
The technical exploitation of this vulnerability occurs when remote attackers send specially crafted HTTP GET requests containing unusually long parameter strings to the affected ZBServer Pro instance. The server's insufficient input validation causes it to copy the excessive data into a predetermined buffer size, leading to memory corruption that can be leveraged to execute arbitrary code on the target system. This vulnerability operates at the application layer of the network stack and requires no authentication to exploit, making it particularly dangerous as it can be triggered by anyone with network access to the server. The attack vector demonstrates characteristics consistent with the attack pattern described in the MITRE ATT&CK framework under technique T1059.007 for command and script injection, where attackers can manipulate the target system through crafted inputs that bypass normal input validation mechanisms.
The operational impact of this vulnerability extends beyond simple remote code execution to potentially compromise entire server infrastructures. Successful exploitation could allow attackers to gain full administrative control over the affected server, enabling them to install malware, steal sensitive data, modify web content, or use the compromised system as a launch point for further attacks against internal networks. Organizations running ZBServer Pro 1.50 were particularly vulnerable because this was a widely deployed server solution in enterprise environments during the early 2000s, making it a prime target for exploitation. The vulnerability's remote nature means that attackers could exploit it from anywhere on the internet without requiring physical access or local network presence, significantly expanding the attack surface and potential impact.
Mitigation strategies for CVE-2000-0002 required immediate action from affected organizations, including applying the vendor-provided patch that corrected the input validation routines and implemented proper buffer size checking mechanisms. Network administrators should have implemented firewall rules to restrict access to the vulnerable server, deployed intrusion detection systems to monitor for suspicious GET requests, and considered implementing application-level firewalls or web application firewalls to filter malicious traffic. The vulnerability highlights the importance of input validation and proper memory management in server applications, principles that align with the OWASP Top Ten security risks, particularly the vulnerability category related to injection flaws. Organizations should have also conducted thorough vulnerability assessments to identify other potentially vulnerable applications and systems, as similar buffer overflow vulnerabilities were prevalent in server software during this period. The incident underscored the critical need for regular security updates and the implementation of secure coding practices that prevent such fundamental flaws from being introduced into software during the development lifecycle, emphasizing the necessity of following secure development guidelines and conducting regular security testing.