CVE-2020-25855 : What You Need to Know

Realtek RTL8195A Wi-Fi Module prior to versions released in April 2020 (up to and excluding 2.08) is vulnerable to a stack buffer overflow, allowing for remote code execution or denial of service.

Understanding CVE-2020-25855

This CVE identifies a critical vulnerability in the Realtek RTL8195A Wi-Fi Module that can be exploited by attackers for malicious purposes.

What is CVE-2020-25855?

The function AES_UnWRAP() in the Realtek RTL8195A Wi-Fi Module does not validate the size parameter for a memcpy() operation, leading to a stack buffer overflow.

The Impact of CVE-2020-25855

Allows for remote code execution or denial of service attacks
Attackers can impersonate an Access Point and target vulnerable Wi-Fi clients
Requires knowledge of the network's PSK to exploit

Technical Details of CVE-2020-25855

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability arises from the lack of validation for the size parameter in a memcpy() operation within the Realtek RTL8195A Wi-Fi Module.

Affected Systems and Versions

Product: Realtek RTL8195A Wi-Fi Module
Versions affected: Before April 2020 (up to and excluding 2.08)

Exploitation Mechanism

Attackers inject a crafted packet into the WPA2 handshake to exploit the stack buffer overflow

Mitigation and Prevention

Protecting systems from CVE-2020-25855 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply patches or updates provided by Realtek for the affected versions
Monitor network traffic for any suspicious activities
Implement network segmentation to limit the impact of potential attacks

Long-Term Security Practices

Regularly update firmware and software to address security vulnerabilities
Conduct security assessments and penetration testing to identify weaknesses
Educate users on safe Wi-Fi practices and the importance of strong network security

Patching and Updates

Realtek may release patches or updates to address the vulnerability
Ensure timely application of these patches to secure the Wi-Fi Module