CVE-2020-25854: Buffer Overflow
First published: Wed Feb 03 2021(Updated: )
The function DecWPA2KeyData() 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 an internal function, rt_arc4_crypt_veneer() or _AES_UnWRAP_veneer(), 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 |
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Frequently Asked Questions
What is the severity of CVE-2020-25854?
The severity of CVE-2020-25854 is high with a CVSS score of 8.1.
Which software is affected by CVE-2020-25854?
The Realtek RTL8195A Wi-Fi Module firmware versions up to and excluding 2.08 are affected by CVE-2020-25854.
What is the vulnerability in CVE-2020-25854?
CVE-2020-25854 is a stack buffer overflow vulnerability in the function DecWPA2KeyData() in the Realtek RTL8195A Wi-Fi Module firmware.
How can the stack buffer overflow vulnerability in CVE-2020-25854 be exploited?
The stack buffer overflow vulnerability in CVE-2020-25854 can be exploited by not validating the size parameter for internal functions, resulting in an overflow that can be exploited.
Is there a fix available for CVE-2020-25854?
Yes, versions released in April 2020 and onwards (excluding 2.08) have addressed the vulnerability in the Realtek RTL8195A Wi-Fi Module firmware.
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