Assessment
CFSE Consequence Paths assesses Tesla Model 3 Gateway Firmware Signature-Bypass / TOCTTOU Code Execution (CVE-2023-32156) at CRITICAL — the worst of 2 risk paths (safety, authority). The dominant consequence is influence over a safety-relevant actuation.
Vulnerability
Tesla Model 3 Gateway Firmware Signature-Bypass / TOCTTOU Code Execution (CVE-2023-32156). Reported attack vector: Adjacent network (requires prior code execution on infotainment to reach Gateway).
CFSE Consequence Paths analysis
The vulnerability is decomposed into one risk path per terminal consequence. Each path is scored on its exposure (reachability × execution complexity) and the authority, perception, and physical/safety it reaches, together with its scale of reuse, scale of execution, and recoverability.
DEVICE_CONTROL_SAFETY → CRITICAL
CPATH:1.0-candidate/TT:DEVICE_CONTROL_SAFETY/RE:1/EC:3/EX:1/PH:4/DP:3/AT:3/CH:4/SR:3/SX:3/OR:2/EV:3/LS:PATCH_AVAILABLE
Exposure EX=1 (reachability-bound) · bands PH=CRITICAL · DP=HIGH · AT=HIGH → base CRITICAL · caps low-exposure cap → assessed CRITICAL.
- Gateway code execution mediates commands to vehicle subsystems; demonstrated opening front trunk/door while car in motion = credible dangerous actuation (PH:4). Position requires prior privileged foothold on infotainment then lateral move to the Gateway ECU (internal, not open-net), so RE:1. The Gateway step itself is low-complexity but reaching it needs the chained foothold = standard-to-advanced researcher workflow (EC:3). Authority is over the vehicle control plane / command path = admin/service-level control (AT:3, not trust-root). Cross-domain bridge: app/infotainment -> internal bus -> physical actuation crosses multiple boundaries and is a reusable pivot (CH:4, boundary_crossing). Reusable across Model 3 on affected firmware given foothold (SR:3); deployment-wide with the prerequisite setup, no per-device physical touch beyond the chain (SX:3). OTA-recoverable (OR:2). Reproduced at Pwn2Own 2023 (EV:3).
- perception_feeds_action — false: this is direct command/actuation, not manipulated perception driving action.
FIRMWARE_TRUST_ROOT → CRITICAL
CPATH:1.0-candidate/TT:FIRMWARE_TRUST_ROOT/RE:1/EC:3/EX:1/PH:4/DP:3/AT:4/CH:4/SR:4/SX:3/OR:3/EV:3/LS:PATCH_AVAILABLE
Exposure EX=1 (reachability-bound) · bands PH=CRITICAL · DP=HIGH · AT=HIGH → base CRITICAL · caps low-exposure cap → assessed CRITICAL.
- The core defect is a signature-validation bypass (TOCTTOU) in the Gateway firmware update mechanism: it defeats firmware authenticity enforcement on a central ECU, letting an attacker run arbitrary unsigned code = subversion of the firmware trust root for that component (AT:4). Position requires prior infotainment code execution then adjacency to the Gateway update path (RE:1). Standard researcher workflow once positioned, Gateway step AC:L but chain-dependent (EC:3). Defeating signature checking is a portable, reusable secret/logic defect applicable across identical units/firmware = supply-chain/trust-mechanism reuse (SR:4); deployment-wide with setup (SX:3). Persistent malicious firmware on the control bridge raises recovery cost beyond a single patch action though Tesla shipped an OTA fix (OR:3). Crosses update/firmware/device boundaries and is a reusable bridge to persistent control (CH:4). Safety-relevant since the compromised ECU governs actuation (PH:3). Firmware/proprietary op-state exposure DP:3. Reproduced (EV:3).
- perception_feeds_action — false.
Published baseline
- v3.1 8.8 HIGH —
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H — NVD
- v3.0 9 CRITICAL —
CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H — ZDI via NVD
The published baseline above is retained for source review. Paths decomposes the consequence into authority, perception, safety, scale, and recoverability paths rather than using the baseline score as the primary registry frame.
Sources