CVE-2020-25855: Buffer Overflow
First published: Wed Feb 03 2021(Updated: )
The function AES_UnWRAP() in the Realtek RTL8195A Wi-Fi Module prior to versions released in April 2020 (up to and excluding 2.08) does not validate the size parameter for a memcpy() operation, resulting in a stack buffer overflow which can be exploited for remote code execution or denial of service. An attacker can impersonate an Access Point and attack a vulnerable Wi-Fi client, by injecting a crafted packet into the WPA2 handshake. The attacker needs to know the network's PSK in order to exploit this.
Credit: vuln@vdoo.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Realtek RTL8195A Firmware | <2.08 | |
| Realtek RTL8195A Firmware |
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Frequently Asked Questions
What is CVE-2020-25855?
CVE-2020-25855 is a vulnerability in the function AES_UnWRAP() in the Realtek RTL8195A Wi-Fi Module prior to versions released in April 2020, which allows for remote code execution or denial of service attacks.
What is the severity of CVE-2020-25855?
The severity of CVE-2020-25855 is high with a CVSS score of 8.1.
How does CVE-2020-25855 affect Realtek RTL8195A Firmware?
CVE-2020-25855 affects Realtek RTL8195A Firmware versions up to and excluding 2.08.
How can CVE-2020-25855 be exploited?
CVE-2020-25855 can be exploited for remote code execution or denial of service attacks by exploiting the stack buffer overflow in the AES_UnWRAP() function.
Is there a fix available for CVE-2020-25855?
Yes, versions of the Realtek RTL8195A Wi-Fi Module released in April 2020 and later include fixes for CVE-2020-25855.
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