#VU53388 Out-of-bounds write in MBUX Infotainment System - CVE-2021-23910

Vulnerability identifier: #VU53388

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-2021-23910

CWE-ID: CWE-787

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 compromise vulnerable system.

The vulnerability exists in HERMES 2.1 on Mercedes-Benz vehicles due to a boundary error when processing untrusted input in RemoteDiagnosisApp. A remote attacker can trigger out-of-bounds write 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.