CVE-2002-0313 in Essentia Web Server
Summary
by MITRE
Buffer overflow in Essentia Web Server 2.1 allows remote attackers to cause a denial of service, and possibly execute arbitrary code, via a long URL.
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Analysis
by VulDB Data Team • 05/30/2025
The vulnerability identified as CVE-2002-0313 represents a critical buffer overflow flaw within the Essentia Web Server version 2.1 that exposes systems to remote exploitation. This vulnerability specifically manifests when the web server processes excessively long URLs, creating a condition where input validation fails to properly constrain buffer boundaries. The flaw resides in the server's handling of Uniform Resource Locators that exceed predetermined memory allocation limits, allowing malicious actors to craft specially formatted requests that trigger memory corruption.
From a technical perspective, this buffer overflow occurs in the URL parsing component of the web server software, where insufficient bounds checking permits data to overflow into adjacent memory regions. The vulnerability follows the common pattern of stack-based buffer overflows where the server's internal buffers cannot accommodate input data exceeding their designated capacity. When a remote attacker submits a malformed URL containing excessive characters, the server's memory management routines fail to properly terminate or truncate the input, leading to unpredictable memory corruption that can overwrite critical program execution data.
The operational impact of this vulnerability extends beyond simple denial of service conditions to potentially enable remote code execution capabilities. While the primary effect manifests as system instability and service disruption, the buffer overflow condition creates opportunities for attackers to inject and execute malicious code within the server's execution context. This represents a significant security risk as it allows unauthorized individuals to gain control over the affected web server, potentially compromising the entire hosting environment. The vulnerability affects systems running the specific Essentia Web Server 2.1 version, making it particularly concerning for organizations that have not implemented proper patch management protocols.
Security professionals should recognize this vulnerability as a classic example of CWE-121, which encompasses stack-based buffer overflow conditions that occur when insufficient bounds checking allows data to overwrite adjacent memory locations. The attack vector aligns with techniques described in the MITRE ATT&CK framework under the T1190 category for Exploit Public-Facing Application, where adversaries target vulnerabilities in externally accessible web services. Organizations should prioritize immediate remediation through official vendor patches or upgrades to newer versions of the Essentia Web Server software. Additionally, implementing network-based protections such as intrusion detection systems and web application firewalls can provide additional defense-in-depth measures to detect and prevent exploitation attempts targeting this specific vulnerability.
The broader implications of this vulnerability highlight the critical importance of proper input validation and memory management practices in web server implementations. This flaw demonstrates how seemingly simple parsing operations can create significant security risks when proper bounds checking mechanisms are absent. System administrators must maintain comprehensive patch management processes and regularly audit their web server configurations to ensure that known vulnerabilities are promptly addressed. The vulnerability also underscores the necessity of conducting regular security assessments and penetration testing to identify similar buffer overflow conditions that may exist in other components of the web infrastructure stack.