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.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: cloudflare

Published: 2023-05-10T11:41:53.902Z

Updated: 2024-08-02T05:57:24.987Z

Reserved: 2023-03-30T15:16:57.957Z

Link: CVE-2023-1732

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2023-05-10T12:15:10.523

Modified: 2024-11-21T07:39:47.283

Link: CVE-2023-1732

cve-icon Redhat

No data.