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Incorrect Behavior Order: Early Amplification


Severity High
Score 7.5/10


In Eclipse Californium version 2.0.0-M1 through 2.7.2 and 3.0.0-M1 through 3.5.0, a DTLS resumption handshake falls back to a DTLS full handshake on a parameter mismatch without using a HelloVerifyRequest. Especially, if used with certificate based cipher suites, that results in message amplification (DDoS other peers) and high CPU load (DoS own peer). The misbehavior occurs only with DTLS_VERIFY_PEERS_ON_RESUMPTION_THRESHOLD values larger than 0.

  • LOW
  • NONE
  • NONE
  • NONE
  • NONE
  • HIGH

CWE-408 - Incorrect Behavior Order: Early Amplification

The software allows an entity to perform a legitimate but expensive operation before authentication or authorization has taken place.

Advisory Timeline

  • Published