SB2021052005 - Multiple vulnerabilities in MBUX Infotainment System on Mercedes-Benz vehicles

Description

This security bulletin contains information about 5 vulnerabilities.

1) Input validation error (CVE-ID: CVE-2021-23906)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 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

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 a message length is not checked in the HiQnet Protocol. A remote attacker can pass specially crafted input and execute arbitrary code on the target system.

2) Out-of-bounds write (CVE-ID: CVE-2021-23910)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 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

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.

3) Input validation error (CVE-ID: CVE-2021-23909)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 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

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

The vulnerability exists in HERMES 2.1 on Mercedes-Benz vehicles due to insufficient validation of user-supplied input in the SH2 MCU. A remote attacker can pass specially crafted input and execute arbitrary code on the target system.

4) Type Confusion (CVE-ID: CVE-2021-23908)

CWE-ID: CWE-843 - Type confusion

CVSSv4: 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

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

The vulnerability exists in the Headunit NTG6 on Mercedes-Benz vehicles due to a type confusion error in MultiSvSetAttributes in the HiQnet Protocol. A remote attacker can pass specially crafted data, trigger a type confusion error and execute arbitrary code on the target system.

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

5) Input validation error (CVE-ID: CVE-2021-23907)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 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

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.

Remediation

Cybersecurity Help is not aware of any official remediation provided by the vendor.

References

• 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