A vulnerability has been found in Nissan Sylphy Classic 2021 and classified as critical. Affected by this vulnerability is an unknown function of the component Remote keyfob System. The manipulation with an unknown input leads to a authentication replay vulnerability. The CWE definition for the vulnerability is CWE-294. A capture-replay flaw exists when the design of the software makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes). As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The remote keyfob system on Nissan Sylphy Classic 2021 sends the same RF signal for each door-open request, which allows for a replay attack.

The weakness was released 05/22/2023. The advisory is shared at chaos-lab.blogspot.com. This vulnerability is known as CVE-2023-33281 since 05/22/2023. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/22/2023). MITRE ATT&CK project uses the attack technique T1040 for this issue.

We expect the 0-day to have been worth approximately $5k-$25k.

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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• Nissan

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• Sylphy Classic

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