PT-2021-11186 · Realtek · Realtek Rtl8195A Wi-Fi Module
Published
2021-02-03
·
Updated
2021-02-08
·
CVE-2020-25853
CVSS v3.1
7.5
High
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions:
Realtek RTL8195A Wi-Fi Module versions prior to 2.08
Description:
The issue arises from the function
CheckMic() not validating the size parameter for internal functions rt md5 hmac veneer() or rt hmac sha1 veneer(), resulting in a stack buffer over-read. This 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, without needing to know the network's PSK.Recommendations:
For versions prior to 2.08, update to version 2.08 or later to resolve the issue. As a temporary workaround, consider restricting access to vulnerable Wi-Fi clients to minimize the risk of exploitation. Avoid using the
CheckMic() function until a patch is available.Exploit
Fix
Buffer Over-read
Out of bounds Read
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Related Identifiers
Affected Products
Realtek Rtl8195A Wi-Fi Module