CVE-2021-27173 : Security Advisory and Response
Learn about CVE-2021-27173 affecting FiberHome HG6245D devices through RP2613, allowing unauthorized access via a telnet backdoor API. Find mitigation steps and security practices to safeguard against this vulnerability.
This article provides insights into CVE-2021-27173, a vulnerability found in FiberHome HG6245D devices through RP2613 that exposes a backdoor API without authentication.
Understanding CVE-2021-27173
This section delves into the details of the CVE-2021-27173 vulnerability affecting FiberHome HG6245D devices.
What is CVE-2021-27173?
CVE-2021-27173 involves a backdoor API on FiberHome HG6245D devices through RP2613 that lacks authentication, enabling unauthorized access to the telnet server.
The Impact of CVE-2021-27173
The vulnerability allows attackers to bypass firewall rules, potentially compromising the integrity and security of the affected devices.
Technical Details of CVE-2021-27173
This section outlines the technical aspects of CVE-2021-27173 for better understanding.
Vulnerability Description
An unauthenticated telnet backdoor API in FiberHome HG6245D devices through RP2613 exposes them to unauthorized remote access, posing significant security risks.
Affected Systems and Versions
The affected systems include FiberHome HG6245D devices running RP2613, with all versions being susceptible to this security issue.
Exploitation Mechanism
The exploitation involves leveraging the telnet?enable=0&key=calculated(BR0_MAC) backdoor API provided by the HTTP server to circumvent firewall protections.
Mitigation and Prevention
To address the CVE-2021-27173 vulnerability, certain measures need to be taken to enhance the security of FiberHome HG6245D devices.
Immediate Steps to Take
Users should disable the telnet service and restrict network access to mitigate the risk of unauthorized entry through the backdoor API.
Long-Term Security Practices
Implementing network segmentation, strong authentication mechanisms, and regular security audits can help fortify the defenses against such vulnerabilities.
Patching and Updates
Vendor-released patches and firmware updates should be promptly applied to ensure that the devices are protected against known security flaws.