CVE-2000-0484 in Small HTTP Server
Summary
by MITRE
Buffer overflow in Small HTTP Server allows remote attackers to cause a denial of service via a long GET request.
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Analysis
by VulDB Data Team • 02/09/2025
The vulnerability identified as CVE-2000-0484 represents a classic buffer overflow flaw within the Small HTTP Server implementation that exposes systems to remote denial of service attacks. This issue stems from inadequate input validation mechanisms within the server's handling of HTTP GET requests, where the application fails to properly sanitize or limit the length of incoming data. The vulnerability manifests when a remote attacker crafts a malicious GET request containing an excessive number of characters, causing the server's buffer allocation to overflow and resulting in system instability or complete service termination.
From a technical perspective, this buffer overflow occurs at the application layer within the HTTP server's request parsing functionality, specifically when processing the URI portion of GET requests. The flaw operates under CWE-121, which categorizes buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The Small HTTP Server implementation likely uses fixed-size buffers to store incoming request data without proper length validation, creating an exploitable condition where attacker-controlled input exceeds the allocated buffer capacity. This type of vulnerability falls under the ATT&CK technique T1499.004 for network denial of service, where adversaries leverage application-level flaws to disrupt service availability.
The operational impact of this vulnerability extends beyond simple service disruption, as it can be exploited by attackers to consume system resources, cause application crashes, or potentially provide a foothold for more sophisticated attacks. When the buffer overflow occurs, it typically results in segmentation faults or memory corruption that leads to the server process terminating unexpectedly, thereby denying legitimate users access to the web service. Organizations running this vulnerable server software face significant risk of service interruption, particularly in environments where continuous availability is critical. The vulnerability's exploitation requires minimal technical skill and can be automated, making it attractive to threat actors seeking to disrupt operations without requiring advanced exploitation techniques.
Mitigation strategies for CVE-2000-0484 should focus on immediate patching of the affected Small HTTP Server implementation, as the most effective solution. Organizations should implement input validation measures that enforce reasonable limits on GET request lengths and establish proper bounds checking for all incoming data. Network-level protections including firewall rules that limit request size and rate limiting mechanisms can provide additional defense in depth. The implementation of proper memory management practices and regular security assessments of web server configurations aligns with industry standards for preventing such vulnerabilities. System administrators should also consider implementing intrusion detection systems to monitor for unusual request patterns that may indicate exploitation attempts, while maintaining comprehensive logging of all HTTP traffic for forensic analysis purposes.