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CVE-2022-36436

Estado: ModificadaCrítica (9.8)—

OSU Open Source Lab VNCAuthProxy through 1.1.1 is affected by an vncap/vnc/protocol.py VNCServerAuthenticator authentication-bypass vulnerability that could allow a malicious actor to gain unauthorized access to a VNC session or to disconnect a legitimate user from a VNC session. A remote attacker with network access to the proxy server could leverage this vulnerability to connect to VNC servers protected by the proxy server without providing any authentication credentials. Exploitation of this issue requires that the proxy server is currently accepting connections for the target VNC server.

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)

Osuosl — Twisted VNC Authentication Proxy

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2022-36436",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2022-36436",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-07-22T19:31:29.289950Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 3.9
      },
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
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    },
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      "affectedData": [
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          "cpes": [
            "cpe:2.3:a:osuosl:twisted_vnc_authentication_proxy:*:*:*:*:*:*:*:*"
          ],
          "vendor": "osuosl",
          "product": "twisted_vnc_authentication_proxy",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "versionType": "custom",
              "lessThanOrEqual": "1.1.1"
            }
          ],
          "defaultStatus": "unknown"
        }
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  ],
  "published": "2022-09-14T11:15:49.567",
  "references": [
    {
      "url": "https://cert.grnet.gr/en/blog/cve-2022-36436-twisted-vnc-authentication-proxy-authentication-bypass/",
      "tags": [
        "Exploit",
        "Patch"
      ],
      "source": "cve@mitre.org"
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    {
      "url": "https://github.com/osuosl/twisted_vncauthproxy/commit/edc149af29242178091b2d6fcd42c3ef0851644b",
      "tags": [
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      "source": "cve@mitre.org"
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    {
      "url": "https://github.com/osuosl/twisted_vncauthproxy/tree/release/1.1.1",
      "tags": [
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      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://pypi.org/project/VNCAuthProxy/",
      "tags": [
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      "source": "cve@mitre.org"
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      "url": "https://cert.grnet.gr/en/blog/cve-2022-36436-twisted-vnc-authentication-proxy-authentication-bypass/",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "tags": [
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
      "url": "https://pypi.org/project/VNCAuthProxy/",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-287"
        }
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    },
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
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          "value": "CWE-287"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "OSU Open Source Lab VNCAuthProxy through 1.1.1 is affected by an vncap/vnc/protocol.py VNCServerAuthenticator authentication-bypass vulnerability that could allow a malicious actor to gain unauthorized access to a VNC session or to disconnect a legitimate user from a VNC session. A remote attacker with network access to the proxy server could leverage this vulnerability to connect to VNC servers protected by the proxy server without providing any authentication credentials. Exploitation of this issue requires that the proxy server is currently accepting connections for the target VNC server."
    },
    {
      "lang": "es",
      "value": "OSU Open Source Lab VNCAuthProxy versiones hasta 1.1.1, está afectado por una vulnerabilidad de omisión de autenticación en el archivo vncap/vnc/protocol.py VNCServerAuthenticator que podría permitir a un actor malicioso conseguir acceso no autorizado a una sesión VNC o desconectar a un usuario legítimo de una sesión VNC. Un atacante remoto con acceso a la red del servidor proxy podría aprovechar esta vulnerabilidad para conectarse a servidores VNC protegidos por el servidor proxy sin proporcionar ninguna credencial de autenticación. Una explotación de este problema requiere que el servidor proxy esté aceptando conexiones para el servidor VNC objetivo"
    }
  ],
  "lastModified": "2026-06-17T04:53:26.970",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:osuosl:twisted_vnc_authentication_proxy:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "DA00DF11-4523-48CD-BA7F-CB23F00D620D",
              "versionEndExcluding": "1.2.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}