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Honda-Civic Keyfob system affected by Counter resynchronization attack

Capture in advance and replay after attack successfully tested on Honda-Civic 2012. However, it will only work once, due to Honda Civic has applied the mechanism of the rolling code to prevent replay attacks such as this.

Video Demo https://www.youtube.com/watch?v=NjbjepeILrk

After each key was pressed, the rolling codes synchronizing counter increased. But the keyfob receiver will accept a sliding window of codes, to avoid accidental key pressing by design.

By replaying the previously eavesdropped Lock/Unlock commands in a special sequence to the Honda-Civic, it will be resynchronizing the counter. Once the counter resync, commands from the previous cycle of the counter can be replayed again.

Video Demo https://www.youtube.com/watch?v=d8CjoV6kPnY

Since it’s only successfully tested on Honda-Civic 2012, How many others may also have been affected by this vulnerability remain unknown.

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