CVE-2004-2118 in Tiny Server
Summary
by MITRE
Tiny Server 1.1 allows remote attackers to cause a denial of service (crash) via a GET request with a long filename, possibly due to a buffer overflow.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 07/15/2019
The vulnerability identified as CVE-2004-2118 affects Tiny Server version 1.1, a lightweight web server implementation that was widely used in embedded systems and small-scale deployments during the early 2000s. This particular flaw represents a classic buffer overflow condition that occurs when the server processes HTTP GET requests containing excessively long filenames. The vulnerability resides in the server's handling of URL paths and file names within the request parsing logic, where insufficient input validation leads to memory corruption when processing malformed requests. The affected system architecture typically operates on embedded devices with limited resources, making such vulnerabilities particularly dangerous as they can completely disrupt service availability.
The technical implementation of this vulnerability stems from improper bounds checking within the server's request processing pipeline. When a remote attacker submits a GET request containing an unusually long filename parameter, the server attempts to store this data in a fixed-size buffer without adequate length verification. This condition creates a situation where the input data exceeds the allocated buffer space, causing memory corruption that ultimately results in application crash and system instability. The vulnerability specifically aligns with CWE-121, which describes stack-based buffer overflow conditions, and represents a precursor to more sophisticated memory corruption attacks that would later be categorized under CWE-787, heap-based buffer overflows. The attack vector requires only a simple HTTP request with an excessively long filename, making it easily exploitable by automated scanning tools and remote threat actors.
The operational impact of CVE-2004-2118 extends beyond simple service disruption to potentially compromise entire embedded systems that rely on Tiny Server for network functionality. In environments where these servers control critical infrastructure components such as network appliances, industrial control systems, or IoT devices, a successful exploitation can result in complete service outages that may last until manual system restart or automated recovery mechanisms are triggered. The vulnerability's remote nature eliminates the need for physical access or local privileges, allowing attackers to maintain persistent availability disruption without detection. From an adversarial perspective, this flaw aligns with ATT&CK technique T1499.004, which describes network denial of service attacks, and demonstrates how seemingly benign web server functionality can be weaponized for operational disruption. Organizations with legacy systems running Tiny Server 1.1 were particularly vulnerable as these systems often lacked modern security monitoring capabilities and regular update procedures.
Mitigation strategies for this vulnerability primarily focus on immediate remediation through software updates and configuration hardening measures. The most effective solution involves upgrading to a patched version of Tiny Server that implements proper input validation and buffer management techniques, ensuring that all incoming requests are subjected to length verification before processing. Network-level defenses should include implementing rate limiting and request size restrictions at firewalls or proxy servers to prevent malformed requests from reaching the vulnerable server. Additionally, system administrators should consider implementing intrusion detection systems that can identify patterns associated with buffer overflow exploitation attempts, particularly those involving long URL parameters. The vulnerability serves as a critical reminder of the importance of proper input validation and memory management in server-side applications, with implications extending to modern web server implementations that must guard against similar memory corruption vulnerabilities. Organizations should also implement regular security assessments of legacy systems to identify and remediate similar vulnerabilities that may exist in other network services running on embedded platforms.