CVE-2020-9395 : What You Need to Know

An issue was discovered on Realtek RTL8195AM, RTL8711AM, RTL8711AF, and RTL8710AF devices before 2.0.6. A stack-based buffer overflow exists in the client code that takes care of WPA2's 4-way-handshake via a malformed EAPOL-Key packet with a long keydata buffer.

Understanding CVE-2020-9395

This CVE involves a critical vulnerability in Realtek devices that could be exploited through a stack-based buffer overflow in the WPA2 4-way-handshake process.

What is CVE-2020-9395?

The vulnerability in Realtek devices allows attackers to trigger a stack-based buffer overflow by sending a specially crafted EAPOL-Key packet with an excessively long keydata buffer.

The Impact of CVE-2020-9395

The exploitation of this vulnerability could lead to remote code execution, denial of service, or other malicious activities by attackers targeting affected Realtek devices.

Technical Details of CVE-2020-9395

This section provides more in-depth technical insights into the CVE.

Vulnerability Description

The vulnerability arises from a stack-based buffer overflow in the client code responsible for handling the WPA2 4-way-handshake on Realtek RTL8195AM, RTL8711AM, RTL8711AF, and RTL8710AF devices.

Affected Systems and Versions

Realtek RTL8195AM devices
Realtek RTL8711AM devices
Realtek RTL8711AF devices
Realtek RTL8710AF devices
Versions before 2.0.6

Exploitation Mechanism

Attackers can exploit this vulnerability by sending a malformed EAPOL-Key packet with an extended keydata buffer, triggering the stack-based buffer overflow.

Mitigation and Prevention

Protecting systems from CVE-2020-9395 requires immediate actions and long-term security measures.

Immediate Steps to Take

Apply vendor-supplied patches or updates promptly.
Implement network segmentation to limit the impact of potential attacks.
Monitor network traffic for any signs of exploitation.

Long-Term Security Practices

Regularly update and patch all software and firmware on Realtek devices.
Conduct security assessments and penetration testing to identify and address vulnerabilities.
Educate users and administrators about secure Wi-Fi practices and potential threats.

Patching and Updates

Realtek has released version 2.0.6, which addresses the stack-based buffer overflow vulnerability. Ensure all affected devices are updated to this patched version.