CVE-2003-0314 in Web Server
Summary
by MITRE
Snowblind Web Server 1.0 allows remote attackers to cause a denial of service (crash) via a URL that ends in a "</" sequence.
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Analysis
by VulDB Data Team • 02/03/2025
The Snowblind Web Server version 1.0 contains a critical vulnerability that enables remote attackers to induce a denial of service condition through carefully crafted HTTP requests. This vulnerability specifically manifests when a malicious user submits a Uniform Resource Locator that terminates with the sequence "</" which represents an incomplete HTML tag structure. The web server fails to properly handle this malformed input, resulting in a complete system crash that renders the service unavailable to legitimate users.
This vulnerability represents a classic buffer over-read or parsing error that falls under the category of improper input validation as defined by CWE-20. The server processes the URL without adequate sanitization or boundary checking, allowing the malformed "</" sequence to trigger an internal error condition that causes the application to terminate unexpectedly. The flaw demonstrates poor error handling mechanisms and inadequate state management within the web server's request processing pipeline. According to ATT&CK framework, this vulnerability maps to T1499.004 which covers network denial of service attacks, specifically targeting application availability through malformed input manipulation.
The operational impact of this vulnerability extends beyond simple service disruption as it provides attackers with a reliable method to compromise system availability. When exploited, the denial of service condition can persist until the web server is manually restarted or the system is rebooted, potentially affecting business operations and user access to web resources. Organizations relying on this vulnerable web server implementation face significant risk of service interruption, particularly in environments where continuous availability is critical. The vulnerability affects systems where the Snowblind Web Server is deployed without proper network segmentation or alternative failover mechanisms.
Mitigation strategies for this vulnerability include immediate patching or upgrading to a newer version of the web server software that properly handles malformed URLs. Network administrators should implement input validation at the perimeter through firewalls or web application firewalls to filter out requests containing suspicious URL patterns. Additionally, configuring the web server to gracefully handle malformed input through proper error handling routines can prevent the crash condition. Organizations should also consider implementing monitoring solutions to detect unusual patterns of requests that might indicate exploitation attempts. The vulnerability highlights the importance of input validation and proper error handling in web server implementations, reinforcing industry best practices for secure coding and defensive programming techniques.