CVE-2017-14937 Information

Description

The airbag detonation algorithm allows injury to passenger-car occupants via predictable Security Access (SA) data to the internal CAN bus (or the OBD connector). This affects the airbag control units (aka pyrotechnical control units or PCUs) of unspecified passenger vehicles manufactured in 2014 or later when the ignition is on and the speed is less than 6 km/h. Specifically there are only 256 possible key pairs and authentication attempts have no rate limit. In addition at least one manufacturer’s interpretation of the ISO 26021 standard is that it must be possible to calculate the key directly (i.e. the other 255 key pairs must not be used). Exploitation would typically involve an attacker who has already gained access to the CAN bus and sends a crafted Unified Diagnostic Service (UDS) message to detonate the pyrotechnical charges resulting in the same passenger-injury risks as in any airbag deployment.

CVSS Vector

CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Reference

http://www.mmt.hs-karlsruhe.de/downloads/IEEM/Schwachstellen/PCU_Vulnerability_Description_HsKA.PDF https://www.rapid7.com/db/modules/post/hardware/automotive/pdt https://www.researchgate.net/publication/321183727_Security_Evaluation_of_an_Airbag-ECU_by_Reusing_Threat_Modeling_Artefacts

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

4.7