CVE-2021-45836 Explained : Impact and Mitigation

An authenticated attacker can execute arbitrary commands as root in Terramaster F4-210, F2-210 TOS 4.2.X (4.2.15-2107141517) by injecting a maliciously crafted input in the request through /tos/index.php?app/hand_app.

Understanding CVE-2021-45836

This CVE describes a critical vulnerability in Terramaster F4-210, F2-210 TOS 4.2.X that allows an authenticated attacker to run commands as root.

What is CVE-2021-45836?

The vulnerability permits an attacker to execute unauthorized commands with elevated privileges on the specified Terramaster devices by manipulating user input.

The Impact of CVE-2021-45836

The exploitation of this vulnerability can lead to complete compromise of the affected device, enabling unauthorized control and access to sensitive data.

Technical Details of CVE-2021-45836

This section provides detailed technical insights into the CVE.

Vulnerability Description

The vulnerability allows an authenticated attacker to inject specially crafted input via /tos/index.php?app/hand_app, leading to the execution of arbitrary commands as the root user.

Affected Systems and Versions

Product: Terramaster F4-210, F2-210
Versions: TOS 4.2.X (4.2.15-2107141517)

Exploitation Mechanism

The attacker injects malicious input into the specified request URL, exploiting the lack of proper input validation to achieve arbitrary command execution.

Mitigation and Prevention

Protecting systems from this CVE requires immediate action and ongoing security measures.

Immediate Steps to Take

Apply security patches released by Terramaster promptly.
Limit network access to vulnerable devices.
Monitor for any unusual system behavior indicating exploitation attempts.

Long-Term Security Practices

Implement the principle of least privilege for user accounts.
Regularly update and patch all software and firmware on Terramaster devices.

Patching and Updates

Ensure continuous monitoring and application of security updates and patches to mitigate the risk of exploitation.