Vulnerability Report: GO-2023-1765

  • CVE-2023-1732, GHSA-2q89-485c-9j2x
  • Affects: github.com/cloudflare/circl
  • Published: May 24, 2023
  • Modified: May 20, 2024

When sampling randomness for a shared secret, the implementation of Kyber and FrodoKEM, did not check whether crypto/rand.Read() returns an error. In rare deployment cases (error thrown by the Read() function), this could lead to a predictable shared secret. The tkn20 and blindrsa components did not check whether enough randomness was returned from the user provided randomness source. Typically the user provides crypto/rand.Reader, which in the vast majority of cases will always return the right number random bytes. In the cases where it does not, or the user provides a source that does not, the blinding for blindrsa is weak and integrity of the plaintext is not ensured in tkn20.

For detailed information about this vulnerability, visit https://github.com/cloudflare/circl/security/advisories/GHSA-2q89-485c-9j2x.

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