CVE-2021-42324 : Exploit Details and Defense Strategies

An issue was discovered on DCN (Digital China Networks) S4600-10P-SI devices before R0241.0470. Due to improper parameter validation in the console interface, it is possible for a low-privileged authenticated attacker to escape the sandbox environment and execute system commands as root via shell metacharacters in the capture command parameters. Command output will be shown on the Serial interface of the device. Exploitation requires both credentials and physical access.

Understanding CVE-2021-42324

What is CVE-2021-42324?

CVE-2021-42324 is a security vulnerability found in DCN S4600-10P-SI devices, allowing a low-privileged authenticated attacker to run system commands as root through shell metacharacters, leading to potential system compromise.

The Impact of CVE-2021-42324

The vulnerability enables attackers to bypass security measures and gain elevated privileges, posing a significant threat to the confidentiality and integrity of affected systems.

Technical Details of CVE-2021-42324

Vulnerability Description

Improper parameter validation in the console interface allows unauthorized users to execute commands with elevated privileges.

Affected Systems and Versions

Affected System: DCN S4600-10P-SI devices
Vulnerable Versions: Before R0241.0470

Exploitation Mechanism

Attackers with low privileges and physical access can exploit the vulnerability by using shell metacharacters in capture command parameters.

Mitigation and Prevention

Immediate Steps to Take

Apply the latest security patches provided by the vendor.
Restrict physical access to the affected devices.
Regularly monitor and audit system commands and activities.

Long-Term Security Practices

Implement stringent authentication mechanisms to prevent unauthorized access.
Conduct security assessments and penetration testing regularly.

Patching and Updates

Timely apply all security updates and patches to ensure the protection of the system against known vulnerabilities.