Toyota Lexus LC Display Control Unit default permission

Summaryinfo

A vulnerability was found in Toyota Lexus LC, Lexus LS, Lexus NX, Lexus RC, Lexus RC F, Camry and Sienna and classified as critical. The affected element is an unknown function of the component Display Control Unit. Executing a manipulation can lead to default permission. This vulnerability is tracked as CVE-2020-5551. The physical device can be targeted for the attack. No exploit exists. This vulnerability is notable in history due to its background and the response it received.

Detailsinfo

A vulnerability was found in Toyota Lexus LC, Lexus LS, Lexus NX, Lexus RC, Lexus RC F, Camry and Sienna. It has been declared as critical. This vulnerability affects an unknown code of the component Display Control Unit. The manipulation with an unknown input leads to a default permission vulnerability. The CWE definition for the vulnerability is CWE-276. During installation, installed file permissions are set to allow anyone to modify those files. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Toyota 2017 Model Year DCU (Display Control Unit) allows an unauthenticated attacker within Bluetooth range to cause a denial of service attack and/or execute an arbitrary command. The affected DCUs are installed in Lexus (LC, LS, NX, RC, RC F), TOYOTA CAMRY, and TOYOTA SIENNA manufactured in the regions other than Japan from Oct. 2016 to Oct. 2019. An attacker with certain knowledge on the target vehicle control system may be able to send some diagnostic commands to ECUs with some limited availability impacts; the vendor states critical vehicle controls such as driving, turning, and stopping are not affected.

The weakness was disclosed 03/30/2020. This vulnerability was named CVE-2020-5551 since 01/06/2020. Local access is required to approach this attack. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 03/30/2020). This vulnerability is assigned to T1222 by the MITRE ATT&CK project. This vulnerability has a historic impact due to its background and reception.

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

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Productinfo

Vendor

• Toyota

Name

• Camry
• Lexus LC
• Lexus LS
• Lexus NX
• Lexus RC
• Lexus RC F
• Sienna

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