CVE-2002-2268 in Webster Http Server
Summary
by MITRE
Buffer overflow in Webster HTTP Server allows remote attackers to execute arbitrary code via a long URL.
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Analysis
by VulDB Data Team • 06/01/2025
The CVE-2002-2268 vulnerability represents a critical buffer overflow flaw in the Webster HTTP Server implementation that fundamentally compromises system security through improper input validation. This vulnerability resides in the server's handling of Uniform Resource Locators, specifically when processing excessively long URLs that exceed the allocated buffer space. The flaw manifests when the web server receives a malformed request containing an abnormally long URL string, causing the application to write beyond its intended memory boundaries and potentially overwrite adjacent memory segments including return addresses and control data. The vulnerability is classified under CWE-121 as a stack-based buffer overflow, which directly enables attackers to manipulate program execution flow through memory corruption techniques. This type of vulnerability falls within the ATT&CK framework under T1059.007 for Command and Scripting Interpreter and T1203 for Exploitation for Client Execution, demonstrating how remote attackers can leverage this weakness to gain unauthorized system access. The Webster HTTP Server's insufficient input length validation creates a predictable attack vector where malicious actors can craft specially designed URLs to trigger the buffer overflow condition.
The technical exploitation of this vulnerability requires a deep understanding of memory layout and stack operations within the affected web server implementation. When a URL exceeding the buffer capacity is processed, the server's memory management routines fail to properly bounds-check the input data before copying it into fixed-size memory buffers. This allows attackers to overwrite critical program state information including the instruction pointer, which can be manipulated to redirect execution flow to malicious code injected into the buffer. The attack typically involves crafting a URL with a carefully calculated length that overflows the buffer and overwrites the return address on the stack, enabling remote code execution with the privileges of the web server process. The vulnerability is particularly dangerous because it operates at the application layer and can be exploited through standard HTTP GET requests without requiring authentication or specialized tools. The buffer overflow occurs during the URL parsing phase before any application logic is executed, making it a pre-authentication remote code execution vulnerability that can be exploited by anyone with network access to the affected server.
The operational impact of CVE-2002-2268 extends beyond simple remote code execution to encompass complete system compromise and potential lateral movement within network environments. Successful exploitation allows attackers to execute arbitrary commands on the vulnerable server, potentially leading to full system takeover, data exfiltration, and use of the compromised system as a pivot point for attacking other network resources. Organizations running affected Webster HTTP Server implementations face significant risk of unauthorized access, data breaches, and service disruption. The vulnerability's remote nature means that attackers can exploit it from anywhere on the internet without requiring physical access or network proximity, making it particularly attractive for automated exploitation campaigns. Security teams must consider the potential for this vulnerability to serve as an initial access vector for more sophisticated attacks, potentially leading to privilege escalation and persistence mechanisms within the compromised environment. The impact is further amplified by the fact that many organizations may have legacy web server implementations that remain unpatched due to operational constraints or lack of awareness about the vulnerability.
Mitigation strategies for CVE-2002-2268 must address both immediate remediation and long-term architectural improvements to prevent similar vulnerabilities in future implementations. The primary recommendation involves applying vendor-provided patches or upgrading to versions of the Webster HTTP Server that include proper input validation and bounds-checking mechanisms. Organizations should implement network-level restrictions including firewall rules that limit access to web server ports and implement URL length restrictions at the network perimeter. Input validation should be strengthened at multiple layers including web server configuration, application-level filters, and network security appliances to prevent malformed URLs from reaching the vulnerable application. The implementation of address space layout randomization and stack canaries can provide additional protection against exploitation attempts, though these are considered defensive measures rather than primary fixes. Security monitoring should include detection of unusually long URL patterns in web server logs, which can serve as indicators of exploitation attempts. Organizations should also conduct comprehensive vulnerability assessments to identify other potential buffer overflow vulnerabilities in their web server infrastructure and ensure that all applications implement proper bounds-checking mechanisms. The vulnerability highlights the importance of following secure coding practices and adhering to security standards such as those outlined in the OWASP Top Ten and NIST guidelines for web application security. Regular security testing including penetration testing and vulnerability scanning should be implemented to identify and remediate similar weaknesses before they can be exploited by malicious actors.