CVE-2006-0148 in Xlpd
Summary
by MITRE
NetSarang Xlpd 2.1 allows remote attackers to cause a denial of service (crash) via a large number of connections from the same IP address.
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Analysis
by VulDB Data Team • 06/23/2025
The vulnerability identified as CVE-2006-0148 affects NetSarang Xlpd version 2.1, a file transfer protocol server implementation that was widely used in enterprise environments for secure data transmission. This particular flaw represents a classic denial of service condition that can be exploited by remote attackers to disrupt legitimate service operations. The vulnerability specifically manifests when the server receives an excessive number of concurrent connections originating from a single source IP address, leading to system instability and potential complete service disruption.
The technical nature of this vulnerability stems from inadequate connection handling and resource management within the Xlpd server implementation. When multiple connections are established from the same IP address, the server fails to properly manage these connection attempts, resulting in resource exhaustion or memory corruption that ultimately causes the service to crash. This type of vulnerability falls under the category of insufficient resource management as classified by CWE-400, where the system does not adequately control or limit the resources consumed by connection requests. The flaw demonstrates poor input validation and connection limiting mechanisms that should normally be in place to prevent such scenarios.
From an operational impact perspective, this vulnerability poses significant risk to organizations relying on NetSarang Xlpd for file transfer operations. Attackers can exploit this weakness by launching connection flood attacks from a single IP address, effectively rendering the service unavailable to legitimate users. The impact extends beyond simple service disruption as it can affect critical business processes that depend on file transfer capabilities, potentially causing data loss, operational delays, and financial consequences. Network administrators may experience difficulty in identifying the source of the disruption due to the single-source nature of the attack, complicating incident response efforts and potentially allowing the attack to continue undetected.
The vulnerability aligns with several ATT&CK framework techniques including T1498 - Network Denial of Service and T1566 - Phishing, as attackers may use this weakness as part of broader attack campaigns. Organizations should implement connection rate limiting and IP-based access controls to mitigate this vulnerability. The recommended mitigation strategies include configuring firewall rules to limit the number of connections per IP address, implementing connection pooling mechanisms, and applying the latest security patches provided by NetSarang. Additionally, network monitoring systems should be configured to detect unusual connection patterns from single sources, enabling early detection and response to potential exploitation attempts. The vulnerability highlights the importance of proper resource management and connection handling in server applications, emphasizing the need for robust defensive measures against resource exhaustion attacks that can compromise system availability and service integrity.