On some platforms, when an attacker can time decapsulation of Kyber on forged cipher texts, they could possibly learn (parts of) the secret key. Does not apply to ephemeral usage, such as when used in the regular way in TLS.
Impact On some platforms, when an attacker can time decapsulation of Kyber on forged cipher texts, they could possibly learn (parts of) the secret key. Does not apply to ephemeral usage, such as when used in the regular way in TLS. Patches Patched in 1.3.7. References kyberslash.cr.yp.to
When sampling randomness for a shared secret, the implementation of Kyber and FrodoKEM, does 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 does 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 …