CVE-2002-0289 in Phusion Webserver
Summary
by MITRE
Buffer overflow in Phusion web server 1.0 allows remote attackers to cause a denial of service and execute arbitrary code via a long HTTP request.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 04/29/2025
The vulnerability identified as CVE-2002-0289 represents a critical buffer overflow flaw within the Phusion web server version 1.0 that exposes systems to remote exploitation. This vulnerability stems from inadequate input validation mechanisms within the server's HTTP request handling process, where the software fails to properly sanitize or limit the length of incoming request data. The flaw exists in the server's parsing logic that processes HTTP headers and request parameters without implementing proper bounds checking, creating an exploitable condition where maliciously crafted requests can overwrite adjacent memory locations.
The technical implementation of this buffer overflow occurs when the Phusion web server receives an HTTP request containing an excessively long string that exceeds the allocated buffer space. According to CWE-121, this vulnerability falls under the category of stack-based buffer overflow, where the overflow corrupts the program's execution flow by overwriting return addresses and other critical stack variables. The attack vector leverages the server's inability to handle oversized input data gracefully, allowing remote attackers to inject malicious code into the server process memory space. This type of vulnerability directly maps to ATT&CK technique T1203, which describes the exploitation of software vulnerabilities to gain unauthorized access or execute arbitrary code.
The operational impact of CVE-2002-0289 extends beyond simple denial of service conditions to encompass complete system compromise and potential lateral movement within network environments. When successfully exploited, the buffer overflow enables attackers to execute arbitrary code with the privileges of the web server process, typically running with elevated system permissions. This compromise can lead to unauthorized data access, system takeover, and establishment of persistent backdoors. The vulnerability's remote nature means that attackers can exploit it without requiring physical access or prior authentication, making it particularly dangerous for publicly accessible web servers. Organizations running vulnerable Phusion web server instances face significant risk of unauthorized access and potential data breaches.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security posture improvements. The primary recommendation involves upgrading to a patched version of the Phusion web server that implements proper input validation and buffer size limitations. System administrators should also implement network-based protections such as intrusion detection systems that can detect and block malformed HTTP requests containing suspiciously long payloads. Additionally, deploying application firewalls and web application firewalls can help filter out malicious requests before they reach the vulnerable server components. The implementation of address space layout randomization and stack canaries can provide additional defense-in-depth measures against exploitation attempts. Organizations should also conduct regular security assessments to identify and remediate similar vulnerabilities in other server software components, ensuring comprehensive protection against buffer overflow attacks that follow the same exploitation patterns.