Rclone is a command-line program used for managing files on cloud storage platforms. It is commonly used by system administrators and IT professionals for backups, file synchronization, and data migrations. Rclone supports many different cloud storage providers, making it a versatile tool in environments where data is spread across multiple services. Such environments can range from small personal setups to large-scale enterprise infrastructures. Its ease of use and wide compatibility make it a popular choice among users managing cloud storage solutions. Because it runs on multiple operating systems, it is adaptable to various user needs and environments.
A command injection vulnerability occurs when an application is tricked into executing unintended commands due to insufficient input validation. In the case of this vulnerability in rclone, an attacker can manipulate input to the RC endpoint operations/fsinfo to execute local commands. This issue is particularly severe because it can be exploited without authentication, allowing a remote attacker to execute commands on the server where rclone is running. The vulnerability arises due to the lack of proper validation of the fs input controlled by the attacker. This can lead to unauthorized command execution that might compromise the entire system.
The vulnerability specifically involves the operations/fsinfo endpoint of rclone's RC interface. By crafting a specially formatted fs input parameter, an attacker can hijack the system's command processing flow. This attack vector works even without the need for global HTTP authentication, thus making it easier for unauthorized users to exploit. The vulnerability allows external attackers to perform arbitrary command execution, leveraging the system's local command execution capabilities through HTTP requests. This significant oversight in input validation and lack of stringent security measures allows attackers to gain expanded control over the affected system.
Successful exploitation of this command injection vulnerability can lead to severe consequences, including unauthorized system access and data manipulation. Attackers can execute potentially harmful commands that can disrupt services, steal sensitive information, or further compromise the system's security. The system could be entirely taken over by a malicious party, leading to data breaches or malicious activities such as installing backdoors for persistent access. This type of vulnerability is particularly dangerous as it might allow attackers to pivot to other systems within the network, extending the breach impact.
REFERENCES
- Upgrade rclone to version 1.73.5 or later to patch this vulnerability.
- Implement network-level restrictions to limit access to the RC interface only from trusted sources.
- Enable global HTTP authentication to protect the RC endpoint.
- Regularly audit and secure configurations to minimize exposures to unauthorized access.
- Educate users about the importance of maintaining updated software to prevent exploitations.
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