GHSA-2q89-485c-9j2x

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GHSA-2q89-485c-9j2x

Summary: Improper random reading in CIRCL

Details: ### Impact 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. ### Patches The fix was introduced in CIRCL v. 1.3.3

References: https://github.com/cloudflare/circl/security/advisories/GHSA-2q89-485c-9j2x, https://nvd.nist.gov/vuln/detail/CVE-2023-1732, https://github.com/cloudflare/circl/commit/ff8d91225f8954b4970b6d6382d2e4c78f4a4cf8, https://github.com/cloudflare/circl, https://github.com/cloudflare/circl/releases/tag/v1.3.3