CVE-2003-0315 in Web Server
Summary
by MITRE
Snowblind Web Server 1.0 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a long HTTP request, which may trigger a buffer overflow.
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Analysis
by VulDB Data Team • 02/03/2025
The Snowblind Web Server version 1.0 contains a critical buffer overflow vulnerability that manifests through malformed HTTP request handling. This vulnerability exists within the server's request parsing mechanism where it fails to properly validate the length of incoming HTTP headers and request data. When an attacker submits an excessively long HTTP request, the server's memory management routines cannot accommodate the oversized input, leading to memory corruption that results in immediate system crash or potential code execution. The vulnerability stems from inadequate input validation and bounds checking within the web server's core processing functions. This flaw represents a classic buffer overflow condition that can be exploited remotely without requiring authentication or prior access to the system.
The technical implementation of this vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflow scenarios. The attack vector operates through standard HTTP communication channels, making it particularly dangerous as it can be exploited by anyone with network access to the affected server. The buffer overflow occurs when the server attempts to copy the oversized HTTP request data into fixed-size memory buffers without proper length verification. This creates a condition where memory adjacent to the allocated buffer becomes overwritten, potentially corrupting program execution flow or allowing attackers to inject and execute malicious code. The vulnerability's impact extends beyond simple denial of service, as successful exploitation could provide attackers with unauthorized access to the underlying system.
The operational impact of CVE-2003-0315 presents significant risks to organizations relying on the Snowblind Web Server for hosting web applications or services. A successful attack could result in complete system compromise, data loss, or unauthorized access to sensitive information stored on the server. The vulnerability's remote exploitability means that attackers do not need physical access or local credentials to cause damage. Organizations using this web server version face potential exposure to automated scanning tools that can identify and exploit this weakness. The attack surface is particularly concerning in environments where the web server is publicly accessible or exposed to untrusted networks. Additionally, the vulnerability may affect other services or applications that depend on the affected web server for functionality, potentially creating cascading failures across interconnected systems.
Mitigation strategies for this vulnerability should include immediate patching or upgrading to a version that addresses the buffer overflow condition. System administrators should implement network-level protections such as intrusion detection systems that can identify and block suspicious HTTP request patterns. Input validation should be strengthened at multiple levels including network firewalls, application layer filters, and web application firewalls to prevent oversized requests from reaching the vulnerable server components. The implementation of proper memory protection mechanisms such as stack canaries, address space layout randomization, and data execution prevention can help reduce the exploitability of similar buffer overflow conditions. Organizations should also conduct comprehensive vulnerability assessments to identify other potentially affected systems and ensure that all web server components are properly configured with appropriate security hardening measures. This vulnerability demonstrates the critical importance of regular security updates and proper input validation practices in preventing remote code execution and denial of service attacks.