What is CVE-2018-18203?

CVE-2018-18203 is a medium-severity vulnerability in Subaru Starlink 2017, classified under Improper Verification of Cryptographic Signature. CVSS score: 6.4/10. Published 2018-11-28.

How severe is CVE-2018-18203?

Medium severity. CVSS v3 base score is 6.4 out of 10.

Is CVE-2018-18203 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Subaru Starlink 2017

CVE-2018-18203

A vulnerability in the update mechanism of Subaru StarLink Harman head units 2017, 2018, and 2019 may give an attacker (with physical access to the vehicle's USB ports) the ability to rewrite the firmware of the head unit. This occurs because the device accepts modified QNX6 filesystem images (as long as the attacker obtains access to certain Harman decryption/encryption code) as a consequence of a bug where unsigned images pass a validity check. An attacker could potentially install persistent malicious head unit firmware and execute arbitrary code as the root user.

EPSS: 0.002 (15.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.0/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

Public proof-of-concept exploits

References

cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2018-18203?: CVE-2018-18203 is a medium-severity vulnerability in Subaru Starlink 2017, classified under Improper Verification of Cryptographic Signature. CVSS score: 6.4/10. Published 2018-11-28.
How severe is CVE-2018-18203?: Medium severity. CVSS v3 base score is 6.4 out of 10.
Is CVE-2018-18203 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.