CVE-2018-16231 in Personal FTP Server
Summary
by MITRE
Michael Roth Software Personal FTP Server (PFTP) through 8.4f allows remote attackers to cause a denial of service (daemon crash) via an unspecified sequence of FTP commands.
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Analysis
by VulDB Data Team • 03/19/2020
The CVE-2018-16231 vulnerability affects Michael Roth Software Personal FTP Server version 8.4f and earlier, representing a denial of service weakness that can be exploited by remote attackers. This vulnerability specifically manifests through an unspecified sequence of FTP commands that can cause the daemon process to crash, effectively disrupting the FTP service availability. The vulnerability exists within the command processing logic of the PFTP server implementation, where certain command sequences are not properly validated or handled, leading to unexpected termination of the service daemon.
From a technical perspective, this vulnerability falls under the category of improper input validation and error handling within network service applications. The flaw occurs when the FTP server receives a sequence of commands that it cannot properly process, resulting in a crash condition. This type of vulnerability is particularly concerning because it can be triggered remotely without requiring authentication, making it accessible to any attacker with network access to the FTP server. The vulnerability demonstrates poor defensive programming practices where the application fails to implement robust error handling mechanisms for malformed or unexpected command sequences.
The operational impact of CVE-2018-16231 extends beyond simple service disruption, as it can be leveraged as part of broader attack campaigns targeting network infrastructure. When exploited successfully, the daemon crash can lead to complete service unavailability for legitimate users while potentially creating opportunities for further exploitation attempts. The vulnerability is classified as a denial of service condition that can be easily reproduced, making it attractive to attackers seeking to disrupt services or create cover for more sophisticated attacks. This weakness can be particularly damaging in environments where FTP services are critical for business operations or where the service is used for file transfers.
Security practitioners should consider this vulnerability in the context of the broader ATT&CK framework, specifically under the T1499 category of network denial of service attacks. The vulnerability aligns with CWE-248, which addresses "Uncaught Exception" conditions in software implementations. Organizations should implement immediate mitigations including updating to the latest version of the PFTP server software, implementing network segmentation to limit access to FTP services, and deploying intrusion detection systems to monitor for exploitation attempts. Additionally, network administrators should consider implementing rate limiting and command filtering mechanisms to reduce the attack surface. The vulnerability serves as a reminder of the importance of proper error handling and input validation in network services, particularly those exposed to untrusted networks.