CVE-2023-1732 (GCVE-0-2023-1732)
Vulnerability from cvelistv5
Published
2023-05-10 11:41
Modified
2025-01-27 18:32
Severity ?
5.3 (Medium) - CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N
Summary
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.
References
cna@cloudflare.comhttps://github.com/cloudflare/circl/security/advisories/GHSA-2q89-485c-9j2xVendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/cloudflare/circl/security/advisories/GHSA-2q89-485c-9j2xVendor Advisory
Impacted products
Vendor Product Version
Cloudflare CIRCL Version: 0   ≤
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