CVE-2020-25853 Memory corruption in Realtek RTL8195A Wi-Fi Module
A stack buffer over-read in the Realtek RTL8195A Wi-Fi module allows remote attackers to cause a denial of service via crafted WPA2 handshake packets.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-25853?
CVE-2020-25853 is a high-severity memory corruption vulnerability in Realtek RTL8195A Wi-Fi Module, published on 3 Feb 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2020-25853?
It affects 1 product.
Products include Realtek Rtl8195a Firmware.
How do I fix CVE-2020-25853?
No fix has been published for CVE-2020-25853 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2020-25853 being exploited?
There is no known exploitation of CVE-2020-25853 in the wild and no public exploit code.
Other vulnerabilities in Realtek RTL8195A Wi-Fi Module
Sources
Also known as GHSA-cf46-h25j-9pmq.