CVE-2024-0547 in Ability FTP Server
Summary
by MITRE • 01/15/2024
A vulnerability has been found in Ability FTP Server 2.34 and classified as problematic. Affected by this vulnerability is an unknown functionality of the component APPE Command Handler. The manipulation leads to denial of service. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. The identifier VDB-250717 was assigned to this vulnerability.
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Analysis
by VulDB Data Team • 02/03/2024
The vulnerability identified as CVE-2024-0547 represents a critical security flaw within Ability FTP Server version 2.34 that specifically targets the APPE Command Handler functionality. This issue falls under the category of denial of service vulnerabilities, which can severely impact the availability and reliability of the affected FTP server implementation. The vulnerability's classification as problematic indicates that it poses a significant risk to system operations and can potentially disrupt legitimate user access to the file transfer services. The fact that this vulnerability has been publicly disclosed and is known to be exploitable means that malicious actors can readily leverage this weakness to compromise the server's operational integrity.
The technical nature of this flaw lies within the APPE Command Handler component, which is responsible for processing append commands in the FTP protocol. When an attacker sends specially crafted APPE commands to the server, the handler fails to properly validate or process the input, leading to a denial of service condition. This type of vulnerability typically occurs when input validation mechanisms are insufficient or absent, allowing malformed requests to cause the server to crash, become unresponsive, or consume excessive system resources. The vulnerability's remote exploitability means that attackers do not need physical access to the system, as they can trigger the denial of service condition over the network through standard FTP connections. The attack vector leverages the standard FTP protocol communication channels, making it particularly dangerous as it can be executed against any system running the vulnerable version of Ability FTP Server.
The operational impact of CVE-2024-0547 extends beyond simple service disruption, as it can result in complete unavailability of the FTP server for legitimate users. This denial of service condition can affect business operations, particularly for organizations that rely on FTP services for data transfer and file management. The vulnerability can be exploited by unauthorized parties to systematically disrupt services, potentially causing financial losses, operational downtime, and reputational damage. Organizations may experience cascading effects where the FTP server disruption impacts other systems that depend on file transfer capabilities. The public disclosure of this exploit means that security researchers and malicious actors have the knowledge and tools necessary to execute attacks against vulnerable systems, making the window for remediation critical. The vulnerability's presence in Ability FTP Server 2.34 suggests that organizations using this specific version are at risk, and the lack of proper input validation in the APPE command handler creates an exploitable condition that can be easily leveraged.
Organizations should prioritize immediate remediation efforts by upgrading to a patched version of Ability FTP Server that addresses the APPE Command Handler vulnerability. The implementation of network-based mitigations such as firewalls and intrusion detection systems can help reduce the attack surface and monitor for suspicious FTP traffic patterns. Additionally, administrators should consider implementing access controls and authentication measures to limit exposure to unauthorized users. The vulnerability aligns with CWE-400, which addresses the weakness of uncontrolled resource consumption, and may also relate to CWE-121, concerning stack-based buffer overflows that could occur during command processing. From an ATT&CK framework perspective, this vulnerability maps to techniques involving service stoppage and resource exhaustion, potentially enabling adversaries to maintain persistent access or conduct further reconnaissance. Regular security assessments and vulnerability scanning should be conducted to identify similar weaknesses in other FTP server implementations and ensure comprehensive protection against denial of service attacks. The disclosure of this exploit underscores the importance of maintaining current security patches and implementing robust monitoring procedures to detect and respond to exploitation attempts.