CVE-2020-25853 : Security Advisory and Response
Learn about CVE-2020-25853 affecting Realtek RTL8195A Wi-Fi Module. Discover the impact, affected versions, exploitation risks, and mitigation steps to secure your systems.
Realtek RTL8195A Wi-Fi Module prior to versions released in April 2020 (up to and excluding 2.08) is vulnerable to a stack buffer over-read issue that can lead to denial of service attacks.
Understanding CVE-2020-25853
This CVE identifies a specific vulnerability in the Realtek RTL8195A Wi-Fi Module.
What is CVE-2020-25853?
The CheckMic() function in the Realtek RTL8195A Wi-Fi Module does not properly validate the size parameter for internal functions, leading to a stack buffer over-read vulnerability. This flaw can be exploited by attackers for denial of service attacks.
The Impact of CVE-2020-25853
The vulnerability allows attackers to impersonate an Access Point and target vulnerable Wi-Fi clients by injecting malicious packets into the WPA2 handshake without needing the network's PSK.
Technical Details of CVE-2020-25853
Realtek RTL8195A Wi-Fi Module is affected by a specific vulnerability.
Vulnerability Description
The CheckMic() function's lack of size parameter validation for internal functions results in a stack buffer over-read vulnerability.
Affected Systems and Versions
- Product: Realtek RTL8195A Wi-Fi Module
- Versions Affected: Before 2020-04-21 (up to and excluding 2.08)
Exploitation Mechanism
- Attackers can exploit this vulnerability to conduct denial of service attacks by injecting crafted packets into the WPA2 handshake.
Mitigation and Prevention
Protecting systems from CVE-2020-25853 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply security patches provided by Realtek for the affected versions.
- Monitor network traffic for any suspicious activities.
Long-Term Security Practices
- Regularly update firmware and software to patch known vulnerabilities.
- Implement network segmentation to limit the impact of potential attacks.
- Educate users on safe Wi-Fi practices to prevent exploitation.
Patching and Updates
- Realtek has released patches addressing this vulnerability. Ensure all affected systems are updated to the patched versions.