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CVE-2021-3978

Estado: AnalizadaMedia (5.5)—

When copying files with rsync, octorpki uses the "-a" flag 0, which forces rsync to copy binaries with the suid bit set as root. Since the provided service definition defaults to root ( https://github.com/cloudflare/cfrpki/blob/master/package/octorpki.service ) this could allow for a vector, when combined with another vulnerability that causes octorpki to process a malicious TAL file, for a local privilege escalation.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Cloudflare — Octorpki

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-3978",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-3978",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-01-29T14:19:06.799392Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "cna@cloudflare.com",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 6,
        "exploitabilityScore": 0.8
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "cna@cloudflare.com",
      "affectedData": [
        {
          "vendor": "Cloudflare",
          "product": "octorpki",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "v1.4.2",
              "versionType": "semver"
            }
          ],
          "platforms": [
            "Go"
          ],
          "packageName": "octorpki",
          "collectionURL": "https://github.com/cloudflare/cfrpki/cmd/octorpki",
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2025-01-29T10:15:07.750",
  "references": [
    {
      "url": "https://github.com/cloudflare/cfrpki/security/advisories/GHSA-3pqh-p72c-fj85",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "cna@cloudflare.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "cna@cloudflare.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-269"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "When copying files with rsync, octorpki uses the \"-a\" flag 0, which forces rsync to copy binaries with the suid bit set as root. Since the provided service definition defaults to root ( https://github.com/cloudflare/cfrpki/blob/master/package/octorpki.service ) this could allow for a vector, when combined with another vulnerability that causes octorpki to process a malicious TAL file, for a local privilege escalation."
    },
    {
      "lang": "es",
      "value": "Al copiar archivos con rsync, octorpki utiliza el indicador \"-a\" 0, que obliga a rsync a copiar binarios con el bit suid establecido como root. Dado que la definición de servicio proporcionada tiene como valor predeterminado root (https://github.com/cloudflare/cfrpki/blob/master/package/octorpki.service), esto podría permitir un vector, cuando se combina con otra vulnerabilidad que hace que octorpki procese un archivo TAL malicioso, para una escalada de privilegios local."
    }
  ],
  "lastModified": "2026-06-17T04:06:19.790",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:cloudflare:octorpki:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "76835CC2-1E72-4632-9904-26EE9A5B2BDF",
              "versionEndExcluding": "1.4.2"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cna@cloudflare.com"
}