FKIE_CVE-2023-1732

Vulnerability from fkie_nvd - Published: 2023-05-10 12:15 - Updated: 2026-06-17 05:28
Severity
5.3 (Medium) - CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N
8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://github.com/cloudflare/circl",
          "defaultStatus": "unaffected",
          "platforms": [
            "Go"
          ],
          "product": "CIRCL",
          "vendor": "Cloudflare",
          "versions": [
            {
              "lessThan": "\u003c1.3.3",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "cna@cloudflare.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:cloudflare:circl:*:*:*:*:*:go:*:*",
              "matchCriteriaId": "39A6B412-BB17-403E-B83A-FCFAD155C1B9",
              "versionEndExcluding": "1.3.3",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "When sampling randomness for a shared secret, the implementation of Kyber and FrodoKEM, did not check whether crypto/rand.Read()\u00a0returns an error. In rare deployment cases (error thrown by the Read()\u00a0function), 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"
    }
  ],
  "id": "CVE-2023-1732",
  "lastModified": "2026-06-17T05:28:38.170",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "NONE",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 4.2,
        "source": "cna@cloudflare.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 8.2,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "LOW",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 4.2,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2023-1732",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-01-27T18:32:18.233703Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2023-05-10T12:15:10.523",
  "references": [
    {
      "source": "cna@cloudflare.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/cloudflare/circl/security/advisories/GHSA-2q89-485c-9j2x"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/cloudflare/circl/security/advisories/GHSA-2q89-485c-9j2x"
    }
  ],
  "sourceIdentifier": "cna@cloudflare.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        },
        {
          "lang": "en",
          "value": "CWE-755"
        }
      ],
      "source": "cna@cloudflare.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-755"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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Sightings

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.