CVE-1999-1003 in WarFTPd
Summary
by MITRE
War FTP Daemon 1.70 allows remote attackers to cause a denial of service by flooding it with connections.
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Analysis
by VulDB Data Team • 04/19/2026
The vulnerability identified as CVE-1999-1003 affects the War FTP Daemon version 1.70, representing a classic denial of service weakness that exploits connection handling mechanisms within the FTP server implementation. This issue stems from inadequate resource management and connection queue handling that fails to properly terminate or limit concurrent connection attempts. The vulnerability allows remote attackers to overwhelm the service by establishing multiple simultaneous connections, leading to system resource exhaustion and service unavailability. The attack vector specifically targets the daemon's inability to efficiently manage connection states and properly implement connection limiting or throttling mechanisms.
From a technical perspective, this vulnerability demonstrates poor implementation of network service handling and resource allocation patterns that are fundamental to secure system design. The War FTP Daemon fails to implement proper connection rate limiting or connection pooling mechanisms, allowing malicious actors to flood the service with connection requests. This creates a scenario where legitimate users cannot establish connections due to resource exhaustion, effectively rendering the FTP service unavailable. The flaw operates at the protocol level where the daemon does not properly validate or limit connection attempts, making it susceptible to connection-based denial of service attacks that align with common attack patterns documented in the attack tactics and techniques framework.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise broader network availability and system stability. When an FTP daemon becomes unresponsive due to connection flooding, it can affect other services running on the same system or network segment that depend on proper resource allocation. Organizations relying on this service for file transfer operations face significant business continuity risks, as the denial of service can occur without any authentication requirements, making it particularly dangerous. The vulnerability affects systems where the War FTP Daemon is deployed and can be exploited by anyone with network access to the affected service, representing a critical weakness in the service's security posture.
Mitigation strategies for this vulnerability should focus on implementing proper connection rate limiting, connection timeout configurations, and resource monitoring mechanisms. Network administrators should consider deploying firewall rules or intrusion prevention systems that can detect and block excessive connection attempts to the FTP service. The implementation of connection pooling and proper resource management within the daemon itself would address the root cause, though this requires patching or upgrading to a more secure version. Organizations should also implement monitoring solutions to detect unusual connection patterns that may indicate an ongoing attack. This vulnerability highlights the importance of following secure coding practices and adhering to industry standards such as those outlined in the CWE database, specifically related to resource management and connection handling weaknesses that can lead to denial of service conditions. The ATT&CK framework categorizes this type of vulnerability under service availability attacks where adversaries exploit implementation flaws to make services unavailable to legitimate users, emphasizing the need for robust defensive measures in network service implementations.