{"schema_version":"1.7.5","id":"GHSA-2q89-485c-9j2x","published":"2023-05-11T20:40:54Z","modified":"2026-07-08T06:27:20.863580212Z","aliases":["CVE-2023-1732","GO-2023-1765"],"related":["CGA-vfrc-8hcx-ccqq"],"summary":"Improper random reading in CIRCL","details":"### Impact\nWhen 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.\n\nThe 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.\n\n\n### Patches\nThe fix was introduced in CIRCL v. 1.3.3\n","affected":[{"package":{"name":"github.com/cloudflare/circl","ecosystem":"Go","purl":"pkg:golang/github.com/cloudflare/circl"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.3.3"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/05/GHSA-2q89-485c-9j2x/GHSA-2q89-485c-9j2x.json"}}],"references":[{"type":"WEB","url":"https://github.com/cloudflare/circl/security/advisories/GHSA-2q89-485c-9j2x"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-1732"},{"type":"WEB","url":"https://github.com/cloudflare/circl/commit/ff8d91225f8954b4970b6d6382d2e4c78f4a4cf8"},{"type":"PACKAGE","url":"https://github.com/cloudflare/circl"},{"type":"WEB","url":"https://github.com/cloudflare/circl/releases/tag/v1.3.3"}],"database_specific":{"cwe_ids":["CWE-20","CWE-755"],"github_reviewed":true,"github_reviewed_at":"2023-05-11T20:40:54Z","nvd_published_at":"2023-05-10T12:15:10Z","severity":"MODERATE"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N"}]}