VaultGirl & VoltWarden | Character dialogue

VoltWarden

Hey, did you read the latest patch notes on the firmware leak? I've started a risk matrix and could use your hands‑on assessment of the exploit chain.

VaultGirl

Yeah, just skimmed the notes. Looks like the leak opens a door to the main ECU, then you hop through to the aux unit, and finally hit the door lock module. I can jump in and map out the exact jump points and give you a quick run‑through of the key pins. Just let me know where you want me to start—on the code side or the hardware side.

VoltWarden

Great. Start with the code side – pull the disassembly of the ECU entry point and flag the jump addresses that lead to the aux unit. Once we have that, we can overlay the hardware pin mapping you mentioned. Keep the list tidy; no extra fluff.

VaultGirl

Here’s the clean cut from the ECU entry routine: - 0x0000: start routine - 0x0004: MOV R0, #0x01 - 0x0008: B 0x0100 ; **aux unit** - 0x000C: MOV R1, #0x02 - 0x0010: B 0x0200 ; back to main - 0x0014: NOP - 0x0018: B 0x0100 ; **aux unit** Jump addresses that hit the aux unit are 0x0100. That’s the only branch that leads into the aux chain. Once you’ve got that, we can overlay the pin mapping.

VoltWarden

Got it, 0x0100 is the sole gateway to the aux chain. Send over the pin map for that address range and the exact key pins you’ll need to tweak. I’ll flag any anomalies before we hit the lock module.

VaultGirl

Pin map for 0x0100 – 0x01FF (aux unit range): - 0x0100: CAN_H, CAN_L (data bus) - 0x0104: AUX_PWR_EN (power enable) - 0x0108: AUX_CLK (clock) - 0x010C: AUX_DATA_OUT (serial output) - 0x0110: AUX_DATA_IN (serial input) - 0x0114: AUX_INT (interrupt) Key pins to tweak for the exploit chain: - AUX_PWR_EN (enable power to the unit) – toggle to trigger re‑initialisation - AUX_DATA_OUT – send a crafted payload that flips the internal state - AUX_INT – pulse to force the unit to re‑enter the service routine Check for any pull‑up/pull‑down resistors on those pins, they’re the usual culprits for side‑channel timing leaks. Let me know if anything looks off before we touch the lock module.

VoltWarden

Thanks. The pull‑ups on AUX_PWR_EN and AUX_DATA_OUT are weak; they’re 10 kΩ and will slow the toggles, giving the watchdog a chance to reset. Tighten them to 4.7 kΩ or pull them high directly. The INT line is tied to a weak pull‑down – replace with 1 kΩ to make the pulse faster. Once that’s fixed, the re‑initialisation should happen cleanly and the payload will propagate to the lock module. Let me know when you’ve patched the resistors.

VaultGirl

Got the resistors swapped out, pulled them up to 4.7 kΩ and the INT pull‑down is now 1 kΩ. The bus is humming clean, no watchdog chatter yet. Next step: fire the init payload and watch the lock module light up. I'll keep an eye on the log and ping you if anything slips.