CVE-2024-1544

CVSS V2 None CVSS V3 None
Description
Generating the ECDSA nonce k samples a random number r and then truncates this randomness with a modular reduction mod n where n is the order of the elliptic curve. Meaning k = r mod n. The division used during the reduction estimates a factor q_e by dividing the upper two digits (a digit having e.g. a size of 8 byte) of r by the upper digit of n and then decrements q_e in a loop until it has the correct size. Observing the number of times q_e is decremented through a control-flow revealing side-channel reveals a bias in the most significant bits of k. Depending on the curve this is either a negligible bias or a significant bias large enough to reconstruct k with lattice reduction methods. For SECP160R1, e.g., we find a bias of 15 bits.
Overview
  • CVE ID
  • CVE-2024-1544
  • Assigner
  • wolfSSL
  • Vulnerability Status
  • PUBLISHED
  • Published Version
  • 2024-08-27T18:44:52.770Z
  • Last Modified Date
  • 2024-08-27T19:14:35.190Z
References
History
Created Old Value New Value Data Type Notes
2024-08-28 13:10:13 Added to TrackCVE