CVE-2021-27171 Explained : Impact and Mitigation

This article provides details about CVE-2021-27171, a vulnerability found in FiberHome HG6245D devices through RP2613 that allows unauthorized users to start a Linux telnetd as root on port 26/tcp.

Understanding CVE-2021-27171

This section delves into the vulnerability, its impacts, technical details, and mitigation strategies.

What is CVE-2021-27171?

CVE-2021-27171 is a security flaw discovered on FiberHome HG6245D devices through RP2613, enabling the initiation of a Linux telnetd as root on port 26/tcp through specific CLI commands.

The Impact of CVE-2021-27171

The vulnerability permits unauthorized access as root on the affected devices, potentially leading to privilege escalation and unauthorized control over the system.

Technical Details of CVE-2021-27171

Learn more about how this vulnerability operates and affects systems.

Vulnerability Description

The issue allows malicious users to execute Linux telnetd as root on port 26/tcp using certain CLI interface commands.

Affected Systems and Versions

FiberHome HG6245D devices running RP2613 are affected by this vulnerability, providing unauthorized access to the telnetd service.

Exploitation Mechanism

Attackers can exploit this issue by utilizing specific commands on the CLI interface to launch a Linux telnetd process as root on port 26/tcp.

Mitigation and Prevention

Discover the necessary steps to secure systems against CVE-2021-27171 and prevent potential exploits.

Immediate Steps to Take

Owners of affected devices should restrict access to CLI commands, apply vendor patches, and monitor for any unauthorized access attempts.

Long-Term Security Practices

Implement robust security measures such as regular system updates, network segmentation, and strong access controls to enhance overall security posture.

Patching and Updates

Stay informed about security updates from FiberHome and promptly apply relevant patches to eliminate the vulnerability and enhance system security.