CVE-2021-21906 Explained : Impact and Mitigation

A stack-based buffer overflow vulnerability has been identified in Garrett Metal Detectors iC Module CMA Version 5.0. This could lead to high impact on confidentiality, integrity, and availability.

Understanding CVE-2021-21906

This CVE highlights a critical vulnerability in the CMA readfile function of Garrett Metal Detectors iC Module CMA Version 5.0, potentially exposing the device to exploitation through a buffer overflow attack.

What is CVE-2021-21906?

The vulnerability stems from how the CMA readfile function is utilized within the iC Module, which offers an authenticated CLI over TCP port 6877. An attacker could leverage this flaw to execute malicious code or commands with elevated privileges.

The Impact of CVE-2021-21906

With a CVSS base score of 8.2 (High), this vulnerability poses a significant threat to affected systems. Attackers can compromise the confidentiality, integrity, and availability of the device, potentially leading to unauthorized access or denial of service.

Technical Details of CVE-2021-21906

This section delves into the specifics of the vulnerability, including its description, affected systems, and exploitation mechanism.

Vulnerability Description

The stack-based buffer overflow occurs in the checkPassword function, triggered every time a user submits a password to the CLI password prompt. This allows an attacker to overwrite the memory buffer and execute arbitrary code.

Affected Systems and Versions

Garrett Metal Detectors iC Module CMA Version 5.0 is confirmed to be affected by this vulnerability. Users of this specific version should take immediate action to mitigate the risk.

Exploitation Mechanism

By sending specially crafted input as the password parameter, an attacker can control the execution flow of the application, leading to unauthorized actions on the device.

Mitigation and Prevention

Protecting systems from CVE-2021-21906 requires a proactive approach to security measures to prevent potential exploitation.

Immediate Steps to Take

Users are advised to restrict network access to vulnerable devices, apply security patches provided by the vendor, and monitor network traffic for any signs of malicious activity.

Long-Term Security Practices

Implementing strict access controls, network segmentation, regular security assessments, and employee training on cybersecurity best practices can enhance overall security posture.

Patching and Updates

Vendor-supplied patches and firmware updates should be applied promptly to address the vulnerability and strengthen the security of the affected systems.