FKIE_CVE-2023-42818

Vulnerability from fkie_nvd - Published: 2023-09-27 21:15 - Updated: 2025-03-25 20:15
Severity ?
5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
JumpServer is an open source bastion host. When users enable MFA and use a public key for authentication, the Koko SSH server does not verify the corresponding SSH private key. An attacker could exploit a vulnerability by utilizing a disclosed public key to attempt brute-force authentication against the SSH service This issue has been patched in versions 3.6.5 and 3.5.6. Users are advised to upgrade. There are no known workarounds for this issue.
References
security-advisories@github.comhttps://github.com/jumpserver/jumpserver/security/advisories/GHSA-jv3c-27cv-w8jvExploit, Vendor Advisory
security-advisories@github.comhttps://www.sonarsource.com/blog/diving-into-jumpserver-attackers-gateway-to-internal-networks-1-2
af854a3a-2127-422b-91ae-364da2661108https://github.com/jumpserver/jumpserver/security/advisories/GHSA-jv3c-27cv-w8jvExploit, Vendor Advisory
Impacted products
Vendor Product Version
fit2cloud jumpserver *
fit2cloud jumpserver *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:fit2cloud:jumpserver:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "1DA8A350-8CAA-4711-BCB6-23A2D61A2892",
              "versionEndExcluding": "3.5.6",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:fit2cloud:jumpserver:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "86D1D7DB-C7D0-4B17-8C3A-584EA152E424",
              "versionEndExcluding": "3.6.5",
              "versionStartIncluding": "3.6.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "JumpServer is an open source bastion host. When users enable MFA and use a public key for authentication, the Koko SSH server does not verify the corresponding SSH private key. An attacker could exploit a vulnerability by utilizing a disclosed public key to attempt brute-force authentication against the SSH service This issue has been patched in versions 3.6.5 and 3.5.6. Users are advised to upgrade. There are no known workarounds for this issue."
    },
    {
      "lang": "es",
      "value": "JumpServer es un host de bastionado de c\u00f3digo abierto. Cuando los usuarios habilitan MFA y usan una clave p\u00fablica para la autenticaci\u00f3n, el servidor Koko SSH no verifica la clave privada SSH correspondiente. Un atacante podr\u00eda aprovechar la vulnerabilidad utilizando una clave p\u00fablica revelada para intentar la autenticaci\u00f3n de fuerza bruta contra el servicio SSH. Este problema se solucion\u00f3 en las versiones 3.6.5 y 3.5.6. Se recomienda a los usuarios que actualicen. No se conocen workarounds para este problema."
    }
  ],
  "id": "CVE-2023-42818",
  "lastModified": "2025-03-25T20:15:19.063",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 5.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 2.5,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2023-09-27T21:15:10.173",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/jumpserver/jumpserver/security/advisories/GHSA-jv3c-27cv-w8jv"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://www.sonarsource.com/blog/diving-into-jumpserver-attackers-gateway-to-internal-networks-1-2"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/jumpserver/jumpserver/security/advisories/GHSA-jv3c-27cv-w8jv"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-287"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-307"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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