CVE-2021-39306 Explained : Impact and Mitigation

A stack buffer overflow vulnerability was discovered on Realtek RTL8195AM devices before version 2.0.10. This vulnerability exists in the client code, allowing an attacker to exploit it by sending a large size Authentication challenge text in WEP security.

Understanding CVE-2021-39306

This section provides insights into the impact and technical details of CVE-2021-39306.

What is CVE-2021-39306?

CVE-2021-39306 is a stack buffer overflow vulnerability found in Realtek RTL8195AM devices before version 2.0.10. The vulnerability occurs in the client code when an attacker sends an oversized Authentication challenge text in WEP security.

The Impact of CVE-2021-39306

The vulnerability could allow an attacker to execute arbitrary code or crash the affected system, posing a significant security risk.

Technical Details of CVE-2021-39306

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability is a stack buffer overflow that affects Realtek RTL8195AM devices prior to version 2.0.10. It arises from processing large Authentication challenge text in WEP security, leading to a potential exploit.

Affected Systems and Versions

Affected Systems: Realtek RTL8195AM devices
Affected Versions: Versions before 2.0.10

Exploitation Mechanism

The vulnerability can be exploited by an attacker sending a big size Authentication challenge text in WEP security, triggering the stack buffer overflow.

Mitigation and Prevention

To address CVE-2021-39306, consider the following mitigation strategies.

Immediate Steps to Take

Update Realtek RTL8195AM devices to version 2.0.10 or later.
Implement network segmentation to limit the impact of potential exploits.
Monitor and restrict network traffic to detect and prevent unauthorized access.

Long-Term Security Practices

Conduct regular security training for users to recognize and report suspicious activities.
Employ network intrusion detection/prevention systems to identify and block malicious network traffic.
Engage in proactive security practices such as regular security audits and vulnerability assessments.

Patching and Updates

Stay informed about security updates from Realtek and apply patches promptly to secure systems against potential vulnerabilities.