CVE-2020-25857 : Vulnerability Insights and Analysis
Learn about CVE-2020-25857 affecting Realtek RTL8195A Wi-Fi Module. Discover the impact, affected systems, exploitation method, and mitigation steps for this stack buffer overflow vulnerability.
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 denial of service attacks.
Understanding CVE-2020-25857
This CVE identifies a critical vulnerability in the Realtek RTL8195A Wi-Fi Module that can be exploited by attackers for denial of service.
What is CVE-2020-25857?
The function ClientEAPOLKeyRecvd() in the Realtek RTL8195A Wi-Fi Module does not validate the size parameter for an rtl_memcpy() operation, leading to a stack buffer overflow. This vulnerability enables attackers to impersonate an Access Point and target vulnerable Wi-Fi clients by injecting malicious packets during the WPA2 handshake.
The Impact of CVE-2020-25857
- Allows for a stack buffer overflow vulnerability (CWE-121) in the affected Wi-Fi module
- Enables denial of service attacks without requiring knowledge of the network's PSK
Technical Details of CVE-2020-25857
Realtek RTL8195A Wi-Fi Module is susceptible to a critical stack buffer overflow vulnerability.
Vulnerability Description
The vulnerability arises from the lack of validation for the size parameter in an rtl_memcpy() operation, leading to a stack buffer overflow.
Affected Systems and Versions
- Product: Realtek RTL8195A Wi-Fi Module
- Vendor: Not applicable
- Versions affected: Versions before 2020-04-21 (up to and excluding 2.08)
Exploitation Mechanism
- Attackers can exploit the vulnerability by injecting crafted packets into the WPA2 handshake, impersonating an Access Point to target vulnerable Wi-Fi clients.
Mitigation and Prevention
Taking immediate steps and implementing long-term security practices are crucial to mitigating the risks associated with CVE-2020-25857.
Immediate Steps to Take
- Update the Realtek RTL8195A Wi-Fi Module to versions released after April 2020 (2.08 and above)
- 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 patch known vulnerabilities
- Conduct security assessments and penetration testing to identify and address weaknesses
Patching and Updates
- Apply patches provided by Realtek for the affected Wi-Fi module
- Stay informed about security advisories and updates from the vendor