#VU50408 Stack-based buffer overflow in Realtek products - CVE-2020-25855

Vulnerability identifier: #VU50408

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-25855

CWE-ID: CWE-121

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
RTL8195AM
Hardware solutions / Firmware
RTL8711AM
Hardware solutions / Firmware
RTL8711AF
Hardware solutions / Firmware
RTL8710AF
Hardware solutions / Firmware

Vendor: Realtek

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in the "AES_UnWRAP()" function. A remote unauthenticated attacker can inject a specially crafted packet to the WPA2 handshake, trigger stack-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

RTL8195AM: before 2.0.8

RTL8711AM: before 2.0.8

RTL8711AF: before 2.0.8

RTL8710AF: before 2.0.8

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External links
https://www.vdoo.com/blog/realtek-rtl8195a-vulnerabilities-discovered/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.