#VU53385 Input validation error in MBUX Infotainment System - CVE-2021-23907

Vulnerability identifier: #VU53385

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-2021-23907

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
MBUX Infotainment System
Client/Desktop applications / Other client software

Vendor: Mercedes-Benz

Description

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

The vulnerability exists in the Headunit NTG6 on Mercedes-Benz vehicles due to the count in MultiSvGet, GetAttributes and MultiSvSet is not checked in the HiQnet Protocol. A remote attacker can pass specially crafted input and execute arbitrary code on the target system.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

MBUX Infotainment System: 2021

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External links
https://keenlab.tencent.com/en/2021/05/12/Tencent-Security-Keen-Lab-Experimental-Security-Assessment-on-Mercedes-Benz-Cars/
https://keenlab.tencent.com/en/whitepapers/Mercedes_Benz_Security_Research_Report_Final.pdf
https://media.daimler.com/marsMediaSite/en/instance/ko.xhtml?oid=49946866

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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.