CVE-2003-1337 in Abyss Web Server
Summary
by MITRE
Heap-based buffer overflow in Aprelium Abyss Web Server 1.1.2 and earlier allows remote attackers to execute arbitrary code via a long HTTP GET request.
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Analysis
by VulDB Data Team • 07/14/2025
The vulnerability identified as CVE-2003-1337 represents a critical heap-based buffer overflow in the Aprelium Abyss Web Server version 1.1.2 and earlier releases. This flaw exists within the web server's handling of HTTP GET requests, where the application fails to properly validate the length of incoming request parameters before processing them in memory. The buffer overflow occurs when an attacker submits a specially crafted HTTP GET request containing an excessive amount of data, causing the application to write beyond the allocated memory boundaries of the heap allocation. This memory corruption vulnerability creates an exploitable condition that can be leveraged by remote attackers to gain unauthorized control over the affected system.
The technical implementation of this vulnerability stems from inadequate input validation mechanisms within the web server's request parsing logic. When processing HTTP GET requests, the Abyss Web Server does not enforce proper bounds checking on the length of query parameters or request strings, allowing maliciously crafted input to overwrite adjacent memory locations. The heap-based nature of the vulnerability means that the overflow affects dynamically allocated memory segments, potentially corrupting heap metadata structures including free lists, chunk headers, or other critical data structures used by the memory allocator. This type of vulnerability is classified under CWE-121 as a stack-based buffer overflow, though the heap-based variant presents unique exploitation challenges and opportunities for code execution.
The operational impact of this vulnerability extends beyond simple denial of service, as it enables remote code execution capabilities that can fundamentally compromise the security posture of affected systems. Attackers can leverage this vulnerability to inject and execute arbitrary code with the privileges of the web server process, potentially leading to complete system compromise, data exfiltration, or establishment of persistent backdoors. The remote nature of the attack means that exploitation can occur from any location without requiring physical access or local network presence, making it particularly dangerous for publicly accessible web servers. This vulnerability directly aligns with ATT&CK technique T1190 for exploitation of remote services and T1059 for execution through command and scripting interpreter, representing a significant threat to web infrastructure security.
Mitigation strategies for CVE-2003-1337 should prioritize immediate patching of the affected Aprelium Abyss Web Server versions to the latest available releases that contain proper input validation and bounds checking mechanisms. Organizations should implement network-level protections including firewall rules that limit access to web server ports and monitor for suspicious HTTP GET request patterns. Additionally, deploying intrusion detection systems capable of identifying long HTTP GET requests can provide early warning of potential exploitation attempts. The implementation of web application firewalls and input sanitization measures can serve as additional defensive layers. System administrators should also consider implementing proper logging and monitoring of web server activities to detect anomalous request patterns that may indicate exploitation attempts. Security hardening practices including disabling unnecessary web server features and maintaining up-to-date security patches across all server components remain essential defensive measures against this class of vulnerability.