CVE-2020-25854 : Exploit Details and Defense Strategies

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-2020-25854

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

What is CVE-2020-25854?

The vulnerability in the Realtek RTL8195A Wi-Fi Module allows attackers to trigger a stack buffer overflow by injecting crafted packets into the WPA2 handshake, potentially leading to remote code execution or denial of service.

The Impact of CVE-2020-25854

Exploiting this vulnerability can enable attackers to impersonate an Access Point and target vulnerable Wi-Fi clients, compromising network security and potentially causing service disruptions.

Technical Details of CVE-2020-25854

Realtek RTL8195A Wi-Fi Module is susceptible to a specific vulnerability that can have severe consequences if exploited.

Vulnerability Description

The function DecWPA2KeyData() in the Realtek RTL8195A Wi-Fi Module fails to validate the size parameter for internal functions, leading to a stack buffer overflow that can be abused for remote code execution or denial of service.

Affected Systems and Versions

Product: Realtek RTL8195A Wi-Fi Module
Vendor: n/a
Versions Affected: Versions before 2020-04-21 (up to and excluding 2.08)

Exploitation Mechanism

Attackers inject crafted packets into the WPA2 handshake
Requires knowledge of the network's PSK to exploit

Mitigation and Prevention

Protecting systems from CVE-2020-25854 requires immediate actions and long-term security measures.

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
Stay informed about security advisories and apply recommended fixes promptly