CVE-2008-3683 in Java System Web Proxy Server
Summary
by MITRE
Unspecified vulnerability in the FTP subsystem in Sun Java System Web Proxy Server 4.0 through 4.0.5 before SP6 allows remote attackers to cause a denial of service (failure to accept connections) via unknown vectors, probably related to exhaustion of file descriptors.
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Analysis
by VulDB Data Team • 11/25/2017
The vulnerability identified as CVE-2008-3683 resides within the FTP subsystem of Sun Java System Web Proxy Server versions 4.0 through 4.0.5 before SP6. This weakness represents a significant security flaw that affects the server's ability to maintain stable network connections and process incoming requests. The unspecified nature of the vulnerability indicates that the exact technical mechanism remains partially obscured, though the impact clearly demonstrates a critical failure in connection management that ultimately results in denial of service conditions. The vulnerability specifically targets the server's capacity to accept new connections, effectively rendering the service unavailable to legitimate users while maintaining the system's operational state.
The technical flaw manifests through potential exhaustion of file descriptors within the server's FTP subsystem, which constitutes a classic resource exhaustion attack vector. File descriptor exhaustion occurs when the system runs out of available file handles or socket connections that can be allocated to new incoming requests. This condition directly relates to CWE-400, which categorizes unchecked resource exhaustion as a fundamental weakness in software design. The vulnerability's impact is particularly severe because it operates at the foundational level of network service availability, where the server's inability to accept new connections creates a cascading failure that affects all users attempting to establish FTP sessions. Attackers can exploit this weakness by repeatedly establishing connections or maintaining connections in states that prevent proper resource cleanup, eventually consuming all available file descriptors and causing legitimate connection attempts to fail.
The operational impact of this vulnerability extends beyond simple service disruption to encompass broader implications for system reliability and business continuity. When the FTP subsystem fails to accept connections, it creates a denial of service condition that can affect enterprise operations relying on the proxy server for network traffic management. The vulnerability's presence in a web proxy server configuration means that attackers can potentially compromise not only FTP services but also impact the overall network infrastructure managed by the proxy. This weakness particularly affects organizations that depend on the proxy server for handling multiple concurrent connections, as the service degradation can propagate throughout the network. The vulnerability's exploitation can occur remotely without requiring authentication, making it particularly dangerous as any external party can potentially trigger the resource exhaustion condition.
Mitigation strategies for CVE-2008-3683 should focus on both immediate defensive measures and long-term architectural improvements. System administrators should implement connection rate limiting and connection timeout configurations to prevent resource exhaustion attacks from overwhelming the server's file descriptor limits. The implementation of proper resource monitoring and alerting mechanisms can help detect early signs of connection exhaustion before complete service failure occurs. Additionally, applying the appropriate service pack or security update that addresses this vulnerability is essential for maintaining system integrity. Organizations should also consider implementing network segmentation and access control measures to limit the attack surface and reduce the potential impact of such vulnerabilities. The vulnerability's relationship to the ATT&CK framework's T1499 technique, which covers network denial of service attacks, underscores the importance of implementing comprehensive network defense strategies that address both direct exploitation vectors and indirect impact mitigation. Regular security assessments and vulnerability scanning should be conducted to identify similar weaknesses in other system components that could be exploited in combination with this vulnerability to create more sophisticated attack scenarios.