Car Pyrotechnical Control Message risky encryption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.3$0-$5k0.00

Summaryinfo

A vulnerability labeled as very critical has been found in Car. Impacted is an unknown function of the component Pyrotechnical Control. The manipulation as part of Message results in risky encryption. This vulnerability is known as CVE-2017-14937. An attack on the physical device is feasible. Furthermore, an exploit is available. This vulnerability is historically impactful due to its background and the reception it garnered.

Detailsinfo

A vulnerability, which was classified as critical, was found in Car (the affected version unknown). Affected is an unknown part of the component Pyrotechnical Control. The manipulation as part of a Message leads to a risky encryption vulnerability. CWE is classifying the issue as CWE-327. The product uses a broken or risky cryptographic algorithm or protocol. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The bug was discovered 10/20/2017. The weakness was published 10/20/2017 by Johannes Braun, Jürgen Dürrwang, Reiner Kriesten and Alexander Pretschner with Hochschule Karlsruhe Technik und Wirtschaft as Vulnerability in pyrotechnical control units of passenger cars as confirmed paper (Website). The advisory is shared for download at mmt.hs-karlsruhe.de. The public release happened without coordination with the vendor. This vulnerability is traded as CVE-2017-14937 since 09/29/2017. The attack needs to be approached locally. The exploitation doesn't require any form of authentication. Technical details are unknown but a public exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 11/27/2019). The MITRE ATT&CK project declares the attack technique as T1600. This vulnerability has a historic impact due to its background and reception. The advisory points out:

Physical injury of passengers by willful detonation1 of pyrotechnical charges while the vehicle is not moving

After immediately, there has been an exploit disclosed. The exploit is shared for download at mmt.hs-karlsruhe.de. It is declared as highly functional. As 0-day the estimated underground price was around $5k-$25k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Further details are available at security-database.com. Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.5
VulDB Meta Temp Score: 4.4

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 4.7
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Risky encryption
CWE: CWE-327 / CWE-310
CAPEC: 🔍
ATT&CK: 🔍

Physical: Yes
Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Highly functional
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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MetaSploit ID: pdt.rb
MetaSploit Name: Check For and Prep the Pyrotechnic Devices (Airbags Battery Clamps etc.)
MetaSploit File: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍
Exploit Delay Time: 🔍

Timelineinfo

09/29/2017 🔍
10/20/2017 +21 days 🔍
10/20/2017 +0 days 🔍
10/20/2017 +0 days 🔍
10/20/2017 +0 days 🔍
10/21/2017 +1 days 🔍
11/27/2019 +767 days 🔍

Sourcesinfo

Advisory: Vulnerability in pyrotechnical control units of passenger cars
Researcher: Johannes Braun, Jürgen Dürrwang, Reiner Kriesten, Alexander Pretschner
Organization: Hochschule Karlsruhe Technik und Wirtschaft
Status: Confirmed

CVE: CVE-2017-14937 (🔍)
GCVE (CVE): GCVE-0-2017-14937
GCVE (VulDB): GCVE-100-108300
scip Labs: https://www.scip.ch/en/?labs.20161013
Misc.: 🔍

Entryinfo

Created: 10/21/2017 14:31
Updated: 11/27/2019 19:14
Changes: 10/21/2017 14:31 (70), 11/27/2019 19:14 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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