CVE-2022-22989 in My Cloud OS
Summary
by MITRE • 01/14/2022
My Cloud OS 5 was vulnerable to a pre-authenticated stack overflow vulnerability on the FTP service that could be exploited by unauthenticated attackers on the network. Addressed the vulnerability by adding defenses against stack overflow issues.
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Analysis
by VulDB Data Team • 02/25/2026
The vulnerability identified as CVE-2022-22989 affects My Cloud OS 5, a network-attached storage solution that provides file sharing and backup services over network protocols including FTP. This pre-authenticated stack overflow vulnerability represents a critical security weakness that allows unauthenticated attackers to exploit the system without requiring valid credentials or prior access. The vulnerability specifically targets the FTP service component of the operating system, making it particularly dangerous as FTP remains a widely used protocol for file transfers and is often exposed to network traffic.
The technical flaw manifests as a stack overflow condition within the FTP service implementation where insufficient input validation occurs when processing malformed or excessively long data packets. This type of vulnerability falls under the Common Weakness Enumeration category CWE-121, which describes stack-based buffer overflow conditions where data written to a fixed-length buffer exceeds its allocated space, potentially overwriting adjacent memory locations including return addresses and control data. Attackers can craft malicious FTP commands that trigger this overflow, potentially leading to arbitrary code execution or service disruption. The pre-authenticated nature of this vulnerability means that the attack vector does not require any form of authentication, making it particularly dangerous for devices connected to untrusted networks.
The operational impact of this vulnerability extends beyond simple service disruption to potentially enable full system compromise. When exploited successfully, the stack overflow could allow attackers to execute malicious code with the privileges of the FTP service process, which typically runs with elevated permissions. This could lead to complete system takeover, data exfiltration, or the establishment of persistent backdoors. Network-based attacks against exposed FTP services could result in unauthorized access to sensitive files stored on the network-attached storage device, particularly concerning for users who store personal documents, business data, or other confidential information. The vulnerability affects systems that are directly accessible from external networks, making it especially dangerous for home users who may have their devices exposed to the internet without proper network segmentation.
Mitigation strategies for this vulnerability should include immediate deployment of vendor-provided security patches that address the stack overflow condition in the FTP service implementation. Organizations and individuals should ensure that their My Cloud OS 5 systems are updated to the latest firmware versions that contain the necessary protections against buffer overflow attacks. Network segmentation practices should be implemented to isolate storage devices from public network access, and FTP services should be disabled if not required for operations. Security monitoring should include detection of unusual FTP traffic patterns and malformed requests that could indicate exploitation attempts. The vulnerability demonstrates the importance of input validation and proper memory management in network services, aligning with ATT&CK technique T1203 which covers Exploitation for Client Execution through buffer overflow vulnerabilities. Additionally, defense-in-depth strategies should include disabling unnecessary services, implementing network access controls, and conducting regular security assessments of network-attached storage devices to identify and remediate similar vulnerabilities before they can be exploited by threat actors.