Vulnerability identifier: #VU55913

Vulnerability risk: High

CVSSv3.1: 9.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2021-35394

CWE-ID: CWE-78

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Realtek SDK
Universal components / Libraries / Software for developers
Realtek Jungle SDK
Universal components / Libraries / Software for developers
Realtek Luna SDK
Universal components / Libraries / Software for developers

Vendor: Realtek

Description

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

The vulnerability exists due to improper input validation within the MP Daemon diagnostic tool. A remote unauthenticated attacker can pass specially crafted data to the application and execute arbitrary OS commands 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

Realtek SDK: 2.0

Realtek Jungle SDK: 3.0 - 3.4T-CT

Realtek Luna SDK: 1.3.2

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External links
http://www.realtek.com/en/cu-1-en/cu-1-taiwan-en
http://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain
http://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdf

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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?

Yes. This vulnerability is being exploited in the wild.