CVE-2021-36380 : What You Need to Know

Sunhillo SureLine before 8.7.0.1.1 is vulnerable to Unauthenticated OS Command Injection through shell metacharacters in ipAddr or dnsAddr when accessing /cgi/networkDiag.cgi.

Understanding CVE-2021-36380

This CVE describes a critical vulnerability in Sunhillo SureLine that can be exploited by an unauthenticated attacker to execute arbitrary operating system commands by injecting malicious inputs.

What is CVE-2021-36380?

CVE-2021-36380 is a security flaw in Sunhillo SureLine versions prior to 8.7.0.1.1 that allows unauthenticated remote attackers to perform OS Command Injection via specific endpoints, posing a significant risk to the integrity and confidentiality of the system.

The Impact of CVE-2021-36380

The exploitation of this vulnerability can lead to unauthorized execution of commands with elevated privileges, potentially resulting in a complete compromise of the affected system, unauthorized data access, and further exploitation of the network.

Technical Details of CVE-2021-36380

This section outlines the key technical aspects of the CVE to provide a comprehensive understanding of the vulnerability.

Vulnerability Description

The vulnerability in Sunhillo SureLine arises from inadequate input validation, allowing an attacker to manipulate ipAddr or dnsAddr parameters to inject malicious shell metacharacters and execute arbitrary OS commands.

Affected Systems and Versions

Sunhillo SureLine versions before 8.7.0.1.1 are confirmed to be impacted by this vulnerability, exposing systems that have not applied the necessary security patches to the risk of exploitation.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending specially crafted requests to the vulnerable endpoint /cgi/networkDiag.cgi with malicious input containing shell metacharacters, thereby gaining unauthorized access to execute commands on the target system.

Mitigation and Prevention

To safeguard systems against the CVE-2021-36380 vulnerability, immediate action and long-term security measures are advised to prevent potential exploitation and secure sensitive data.

Immediate Steps to Take

System administrators are urged to apply the latest security patches provided by Sunhillo for SureLine to mitigate the threat posed by this vulnerability and prevent unauthorized command execution.

Long-Term Security Practices

Implementing strict input validation mechanisms, enforcing least privilege access controls, and conducting regular security assessments can enhance the overall security posture of the system to prevent similar vulnerabilities in the future.

Patching and Updates

Regularly monitoring security advisories from Sunhillo and promptly applying recommended patches and updates is crucial to addressing known vulnerabilities and ensuring the protection of critical systems.