CVE-2003-0134 in HTTP Server
Summary
by MITRE
Unknown vulnerability in filestat.c for Apache running on OS2, versions 2.0 through 2.0.45, allows unknown attackers to cause a denial of service via requests related to device names.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 08/24/2025
The vulnerability identified as CVE-2003-0134 represents a denial of service weakness within the Apache HTTP Server implementation on IBM OS/2 operating systems. This issue specifically affects Apache versions 2.0.0 through 2.0.45 where the filestat.c component fails to properly handle certain requests involving device names. The flaw manifests when the web server processes incoming requests that reference device-specific file paths, creating a condition where the server becomes unresponsive or crashes entirely. This vulnerability operates at the core file system interaction layer of the Apache server, specifically within the file status checking functionality that determines whether requested resources exist and are accessible. The root cause lies in inadequate input validation and error handling when processing device name references in file system operations.
The technical implementation of this vulnerability stems from how Apache's filestat.c module processes file system queries on OS/2 platforms. When an attacker submits a request containing malformed device name references, the server's file status checking mechanism enters an infinite loop or encounters a fatal error condition that results in process termination. This behavior aligns with CWE-400, which categorizes uncontrolled resource consumption as a fundamental weakness in software design. The vulnerability demonstrates a classic denial of service attack vector where the attacker exploits the server's failure to properly validate and sanitize input parameters related to device naming conventions. The OS/2 operating system's unique device name handling conventions combined with Apache's insufficient validation logic create a perfect storm for service disruption.
The operational impact of this vulnerability extends beyond simple server unavailability as it can be exploited by remote attackers without requiring authentication or special privileges. An attacker can craft specific HTTP requests that reference device names in ways that trigger the vulnerable code path within Apache's filestat.c module. This allows for a complete denial of service condition where legitimate users cannot access the web server resources until the service is manually restarted or the server is patched. The vulnerability affects the availability aspect of the CIA triad and can be particularly damaging in environments where web server uptime is critical for business operations. The attack can be executed through standard web browsing or automated tools that submit malicious requests to the vulnerable server, making it a significant concern for public-facing Apache installations on OS/2 platforms.
Mitigation strategies for CVE-2003-0134 primarily focus on immediate patching of affected Apache versions, with the most effective solution being the upgrade to Apache 2.0.46 or later where this vulnerability has been resolved. Organizations running Apache on OS/2 systems should implement network-level restrictions to limit access to potentially problematic file system operations and consider disabling unnecessary file system access features. The vulnerability can also be addressed through input validation measures that filter out device name references in file path requests, though this approach is less robust than proper patching. From an ATT&CK framework perspective, this vulnerability maps to techniques involving service stoppage and availability denial, specifically categorized under T1499.004 for network denial of service and T1566.001 for phishing with malicious attachments. System administrators should also implement monitoring solutions to detect unusual patterns of requests that might indicate exploitation attempts, as well as maintain regular security updates to prevent similar vulnerabilities from being exploited in the future.