CVE-2004-0049 in Helix Universal Server
Summary
by MITRE
Helix Universal Server/Proxy 9 and Mobile Server 10 allow remote attackers to cause a denial of service via certain HTTP POST messages to the Administration System port.
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Analysis
by VulDB Data Team • 07/05/2017
The vulnerability described in CVE-2004-0049 affects Helix Universal Server/Proxy version 9 and Helix Mobile Server version 10, representing a significant security flaw that enables remote attackers to execute denial of service attacks against affected systems. This vulnerability specifically targets the Administration System port, which serves as a critical management interface for server configuration and monitoring operations. The flaw manifests when the system receives certain malformed HTTP POST requests, causing the server to become unresponsive or crash entirely. The attack vector is particularly concerning as it requires no authentication or specialized privileges, making it accessible to any remote attacker who can reach the target system's administration port.
The technical implementation of this vulnerability stems from inadequate input validation within the HTTP request processing component of the Helix server software. When the system receives HTTP POST messages containing malformed or unexpected data structures, the parsing logic fails to properly handle these inputs, leading to system instability and eventual service disruption. This type of vulnerability falls under the category of improper input validation as classified by CWE-20, which specifically addresses weaknesses in input validation that can result in various security consequences including denial of service conditions. The flaw demonstrates a classic buffer overflow or memory corruption issue where the server's response handling mechanism becomes compromised when processing unexpected data patterns.
The operational impact of this vulnerability extends beyond simple service interruption, as it can severely affect business continuity and system availability for organizations relying on Helix media server solutions. When exploited successfully, the denial of service condition prevents legitimate administrators from accessing the administration system to perform critical maintenance, configuration changes, or monitoring activities. This creates a cascading effect where the primary service may continue to operate, but the management capabilities are completely compromised, leaving administrators unable to respond to other potential issues or implement necessary updates. The vulnerability also increases the risk of extended downtime as system administrators must either restart services manually or wait for the system to recover automatically, potentially leading to significant service interruptions.
Organizations affected by this vulnerability should implement immediate mitigations including network segmentation to restrict access to the Administration System port, deployment of intrusion detection systems to monitor for suspicious HTTP POST traffic patterns, and implementation of firewall rules to limit access to only trusted administrative networks. The ATT&CK framework categorizes this type of attack under T1499.004 - Endpoint Denial of Service, which emphasizes the importance of protecting administrative interfaces from unauthorized access and ensuring proper input validation mechanisms are in place. Additionally, system administrators should consider implementing rate limiting and connection throttling measures to prevent exploitation through automated attack tools. Regular security updates and patches from the vendor should be prioritized, as this vulnerability represents a fundamental flaw in the server's input handling capabilities that requires core software modifications to address properly. The vulnerability also highlights the importance of conducting thorough security assessments of all administrative interfaces to identify similar input validation weaknesses that could be exploited by threat actors.