CVE-2003-1318 in Webserver
Summary
by MITRE
Twilight Webserver 1.3.3.0 allows remote attackers to cause a denial of service (application crash) via a GET request for a long URI, a different vulnerability than CVE-2004-2376.
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Analysis
by VulDB Data Team • 02/05/2025
The vulnerability identified as CVE-2003-1318 affects the Twilight Webserver version 1.3.3.0 and represents a classic buffer overflow condition that manifests through malformed URI handling. This weakness falls under the broader category of improper input validation and memory management flaws that have plagued web server implementations since the early days of internet infrastructure. The vulnerability specifically arises when the web server processes GET requests containing excessively long Uniform Resource Identifiers, causing the application to crash and resulting in a denial of service condition that affects legitimate users attempting to access the service.
The technical mechanism behind this vulnerability involves the web server's insufficient bounds checking when processing incoming URI data. When a remote attacker crafts a GET request with a URI exceeding the allocated buffer size, the server fails to properly handle the overflow condition, leading to memory corruption that ultimately terminates the application process. This type of vulnerability is classified as a CWE-121 heap-based buffer overflow or CWE-122 stack-based buffer overflow depending on the specific implementation details, and represents a fundamental flaw in the server's input sanitization and memory allocation procedures. The vulnerability operates at the application layer of the network stack and requires no authentication or specialized privileges to exploit, making it particularly dangerous in unpatched environments.
The operational impact of this vulnerability extends beyond simple service disruption to potentially enable more sophisticated attack vectors. When the web server crashes due to the malformed URI request, legitimate users experience complete service unavailability, which can result in significant business disruption and potential financial losses. Organizations relying on this web server for critical applications face the risk of prolonged downtime while administrators work to restore service and implement security patches. The vulnerability also demonstrates poor defensive programming practices that could indicate additional security weaknesses within the same codebase, potentially exposing the system to further exploitation attempts.
Mitigation strategies for CVE-2003-1318 should include immediate patching of the affected web server software to address the buffer overflow condition. System administrators should implement input validation measures that limit the maximum length of URIs processed by the web server, creating additional defensive layers against similar attacks. Network-level protections such as intrusion detection systems can be configured to monitor for unusually long URI patterns and automatically block suspicious requests. The implementation of proper error handling and graceful degradation mechanisms within the web server software can help prevent complete application crashes when malformed requests are received. Organizations should also consider deploying web application firewalls that can filter out malformed HTTP requests before they reach the vulnerable server components, providing an additional layer of protection against this and similar vulnerabilities that have been documented in the ATT&CK framework under the technique of application layer attacks. Regular security assessments and vulnerability scanning should be conducted to identify similar buffer overflow conditions that may exist in other components of the web infrastructure.