Description
Weak authentication between the Wireless Control Module (WCM) and the Engine Control Module (ECM) of the Indian Motorcycle Scout Bobber + Tech 2025 model year allows an adjacent-network attacker with read access to the in-vehicle network to recover the per-vehicle ECM immobilizer secret by passively observing a single seed/key exchange. The WCM derives its response using a reversible, non-cryptographic operation rather than a cryptographic challenge-response, so the persistent immobilizer secret can be reconstructed from one captured exchange. With this secret the attacker can authenticate to the ECM independently of the WCM and start the engine, defeating the immobilizer. Specific protocol details have been withheld pending vendor remediation.
Problem types
CWE-327 Use of a Broken or Risky Cryptographic Algorithm
CWE-798 Use of Hard-coded Credentials
Product status
2025 (model-year)
Timeline
| 2025-03-26: | Reported to Indian Motorcycle by Rustic Security LLC (responsible disclosure) |
Credits
Scott Sheahan, Rustic Security LLC
References
www.asrg.io/...9323-indian-scout-wcm-ecm-weak-authentication