CVE-2021-27561 Explained : Impact and Mitigation
Learn about CVE-2021-27561, a command injection vulnerability in Yealink Device Management (DM) 3.6.0.20 that allows unauthorized access to the system. Find mitigation strategies here.
Yealink Device Management (DM) 3.6.0.20 is affected by a vulnerability that allows command injection as root via the /sm/api/v1/firewall/zone/services URI without authentication.
Understanding CVE-2021-27561
This section provides details about the CVE-2021-27561 vulnerability, its impact, technical details, and mitigation strategies.
What is CVE-2021-27561?
CVE-2021-27561 refers to a command injection vulnerability in Yealink Device Management (DM) 3.6.0.20. Attackers can exploit this issue to execute commands as the root user without the need for authentication.
The Impact of CVE-2021-27561
This vulnerability can be leveraged by malicious actors to gain unauthorized access to the affected system and execute arbitrary commands with elevated privileges.
Technical Details of CVE-2021-27561
This section provides a deeper dive into the technical aspects of the CVE-2021-27561 vulnerability.
Vulnerability Description
Yealink Device Management (DM) 3.6.0.20 is susceptible to command injection attacks through the /sm/api/v1/firewall/zone/services URI, allowing unauthorized users to execute commands with root privileges.
Affected Systems and Versions
The vulnerability affects Yealink Device Management (DM) version 3.6.0.20.
Exploitation Mechanism
Attackers can exploit this vulnerability by sending specially crafted requests to the /sm/api/v1/firewall/zone/services URI, enabling them to inject and execute arbitrary commands.
Mitigation and Prevention
Protecting systems from CVE-2021-27561 requires immediate action and long-term security measures.
Immediate Steps to Take
Administrators should restrict access to the affected URI, apply security patches provided by the vendor, and monitor for any unauthorized activities.
Long-Term Security Practices
Implementing strong authentication mechanisms, regularly updating software, and conducting security audits can help prevent similar vulnerabilities in the future.
Patching and Updates
Ensure that Yealink Device Management (DM) is updated to a secure version that addresses the command injection vulnerability discovered in version 3.6.0.20.