ghsa-2q89-485c-9j2x
Vulnerability from github
Published
2023-05-11 20:40
Modified
2023-05-24 18:31
Severity ?
5.3 (Medium) - CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N
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

Show details on source website

To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/cloudflare/circl"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.3.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-1732"
  ],
  "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"
  },
  "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",
  "id": "GHSA-2q89-485c-9j2x",
  "modified": "2023-05-24T18:31:42Z",
  "published": "2023-05-11T20:40:54Z",
  "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Improper random reading in CIRCL"
}


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