Vulnerability identifier: #VU55911

Vulnerability risk: High

CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-35392

CWE-ID: CWE-121

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 code on the target system.

The vulnerability exists due to unsafe crafting of SSDP NOTIFY messages from received M-SEARCH messages ST header. A remote unauthenticated attacker can 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

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?

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