CVE-2020-25853
Last modified
CVE-2020-25853 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. The function CheckMic() 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_md5_hmac_veneer() or _rt_hmac_sha1_veneer(), resulting in a stack buffer over-read which can be exploited for 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. EPSS estimates a 1.25% chance of exploitation in the next 30 days.
Description
The function CheckMic() 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_md5_hmac_veneer() or _rt_hmac_sha1_veneer(), resulting in a stack buffer over-read which can be exploited for 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 does not need to know the network's PSK.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Realtek | Rtl8195a Firmware | < 2.08 |
References
- https://www.vdoo.com/blog/realtek-rtl8195a-vulnerabilities-discovered/Exploit, Third Party Advisory
- https://www.vdoo.com/blog/realtek-rtl8195a-vulnerabilities-discovered/Exploit, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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