CVE-2003-1364 in Abyss Web Server
Summary
by MITRE
Aprelium Technologies Abyss Web Server 1.1.2, and possibly other versions before 1.1.4, allows remote attackers to cause a denial of service (crash) via an HTTP GET message with empty (1) Connection or (2) Range fields.
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Analysis
by VulDB Data Team • 07/14/2025
The vulnerability identified as CVE-2003-1364 affects the Abyss Web Server version 1.1.2 and potentially earlier versions up to 1.1.3, representing a critical denial of service flaw that can be exploited by remote attackers to crash the web server instance. This vulnerability specifically targets the server's handling of HTTP GET requests and demonstrates a classic buffer over-read or improper input validation issue that occurs when the server processes malformed connection headers. The flaw manifests when an attacker sends a specially crafted HTTP GET request containing empty Connection or Range header fields, which causes the server to fail during processing and subsequently crash. This type of vulnerability falls under CWE-129, which describes improper validation of the length of input data, and more specifically aligns with CWE-20, representing improper input validation. The attack vector operates through the standard HTTP protocol where the web server receives and attempts to parse the Connection or Range header fields, which are typically used for managing persistent connections and range requests respectively. When these fields are present but contain no data, the server's parsing logic fails to properly handle the empty values, leading to an unhandled exception or memory corruption that results in the complete service disruption. This vulnerability is particularly concerning as it requires no authentication or special privileges to exploit, making it a prime candidate for automated denial of service attacks that can be launched from any internet-connected device.
The operational impact of this vulnerability extends beyond simple service interruption as it can be leveraged in coordinated attack campaigns to render web servers completely inaccessible to legitimate users. Attackers can easily craft and deploy scripts that repeatedly send these malformed requests, causing the server to continuously crash and restart, leading to sustained denial of service conditions that can persist until the server is manually restarted or the vulnerable software is updated. The vulnerability also represents a significant risk to web applications that rely on this specific web server implementation, as it can be used to disrupt business operations and potentially impact revenue streams for organizations dependent on web services. From an attack methodology perspective, this vulnerability aligns with techniques described in the MITRE ATT&CK framework under the T1499 category for network denial of service, specifically targeting the service availability aspect of the attack lifecycle. The exploitation process is straightforward and automated, requiring minimal technical expertise, which makes it particularly dangerous for widespread deployment in botnet campaigns or as part of larger cyber warfare operations.
The recommended mitigation strategies for this vulnerability involve immediate patching of the Abyss Web Server to version 1.1.4 or later, where the developers have implemented proper input validation for header fields. Organizations should also consider implementing network-level protections such as firewall rules that can filter malformed HTTP requests or rate limiting mechanisms that can prevent the rapid succession of requests that would trigger the vulnerability. Additionally, deploying intrusion detection systems that can identify and alert on suspicious HTTP patterns, including empty header fields, can provide early warning of attempted exploitation. System administrators should also implement proper monitoring and alerting for server crashes or restarts, as these events can serve as indicators of exploitation attempts. The vulnerability highlights the importance of robust input validation practices and proper error handling in web server implementations, particularly when dealing with HTTP header parsing. Organizations should conduct regular security assessments of their web server configurations and ensure that all third-party web server software is kept up to date with the latest security patches. The incident also underscores the necessity of implementing defense-in-depth strategies that include both perimeter security controls and application-level protections to prevent exploitation of similar vulnerabilities in the future.