CVE-2023-42818 (GCVE-0-2023-42818)

Vulnerability from cvelistv5 – Published: 2023-09-27 20:28 – Updated: 2025-03-25 19:28
VLAI?
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.
Severity ?
5.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
CWE
  • CWE-287 - Improper Authentication
Assigner
References
Impacted products
Vendor Product Version
jumpserver jumpserver Affected: >= 3.6.0, < 3.6.5
Affected: < 3.5.6
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T19:30:24.806Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "name": "https://github.com/jumpserver/jumpserver/security/advisories/GHSA-jv3c-27cv-w8jv",
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://github.com/jumpserver/jumpserver/security/advisories/GHSA-jv3c-27cv-w8jv"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "affected": [
          {
            "cpes": [
              "cpe:2.3:a:jumpserver:jumpserver:*:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "jumpserver",
            "vendor": "jumpserver",
            "versions": [
              {
                "lessThan": "3.6.5",
                "status": "affected",
                "version": "3.6.0",
                "versionType": "custom"
              },
              {
                "lessThan": "3.5.6",
                "status": "affected",
                "version": "0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2023-42818",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-23T18:52:26.646507Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-09-23T19:02:05.186Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "jumpserver",
          "vendor": "jumpserver",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 3.6.0, \u003c 3.6.5"
            },
            {
              "status": "affected",
              "version": "\u003c 3.5.6"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-287",
              "description": "CWE-287: Improper Authentication",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-03-25T19:28:32.560Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/jumpserver/jumpserver/security/advisories/GHSA-jv3c-27cv-w8jv",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/jumpserver/jumpserver/security/advisories/GHSA-jv3c-27cv-w8jv"
        },
        {
          "name": "https://www.sonarsource.com/blog/diving-into-jumpserver-attackers-gateway-to-internal-networks-1-2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://www.sonarsource.com/blog/diving-into-jumpserver-attackers-gateway-to-internal-networks-1-2"
        }
      ],
      "source": {
        "advisory": "GHSA-jv3c-27cv-w8jv",
        "discovery": "UNKNOWN"
      },
      "title": "SSH public key login without private key challenge if mfa is enabled in jumpserver"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2023-42818",
    "datePublished": "2023-09-27T20:28:30.507Z",
    "dateReserved": "2023-09-14T16:13:33.309Z",
    "dateUpdated": "2025-03-25T19:28:32.560Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "fkie_nvd": {
      "configurations": "[{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:fit2cloud:jumpserver:*:*:*:*:*:*:*:*\", \"versionEndExcluding\": \"3.5.6\", \"matchCriteriaId\": \"1DA8A350-8CAA-4711-BCB6-23A2D61A2892\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:fit2cloud:jumpserver:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"3.6.0\", \"versionEndExcluding\": \"3.6.5\", \"matchCriteriaId\": \"86D1D7DB-C7D0-4B17-8C3A-584EA152E424\"}]}]}]",
      "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": "2024-11-21T08:23:16.650",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"security-advisories@github.com\", \"type\": \"Secondary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L\", \"baseScore\": 5.4, \"baseSeverity\": \"MEDIUM\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"REQUIRED\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"LOW\", \"availabilityImpact\": \"LOW\"}, \"exploitabilityScore\": 2.8, \"impactScore\": 2.5}, {\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\", \"baseScore\": 9.8, \"baseSeverity\": \"CRITICAL\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 3.9, \"impactScore\": 5.9}]}",
      "published": "2023-09-27T21:15:10.173",
      "references": "[{\"url\": \"https://github.com/jumpserver/jumpserver/security/advisories/GHSA-jv3c-27cv-w8jv\", \"source\": \"security-advisories@github.com\", \"tags\": [\"Exploit\", \"Vendor Advisory\"]}, {\"url\": \"https://github.com/jumpserver/jumpserver/security/advisories/GHSA-jv3c-27cv-w8jv\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Exploit\", \"Vendor Advisory\"]}]",
      "sourceIdentifier": "security-advisories@github.com",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"security-advisories@github.com\", \"type\": \"Secondary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-287\"}]}, {\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-307\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-42818\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2023-09-27T21:15:10.173\",\"lastModified\":\"2025-03-25T20:15:19.063\",\"vulnStatus\":\"Modified\",\"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.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L\",\"baseScore\":5.4,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":2.8,\"impactScore\":2.5},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-287\"}]},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-307\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:fit2cloud:jumpserver:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"3.5.6\",\"matchCriteriaId\":\"1DA8A350-8CAA-4711-BCB6-23A2D61A2892\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:fit2cloud:jumpserver:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.6.0\",\"versionEndExcluding\":\"3.6.5\",\"matchCriteriaId\":\"86D1D7DB-C7D0-4B17-8C3A-584EA152E424\"}]}]}],\"references\":[{\"url\":\"https://github.com/jumpserver/jumpserver/security/advisories/GHSA-jv3c-27cv-w8jv\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Exploit\",\"Vendor Advisory\"]},{\"url\":\"https://www.sonarsource.com/blog/diving-into-jumpserver-attackers-gateway-to-internal-networks-1-2\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/jumpserver/jumpserver/security/advisories/GHSA-jv3c-27cv-w8jv\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Exploit\",\"Vendor Advisory\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://github.com/jumpserver/jumpserver/security/advisories/GHSA-jv3c-27cv-w8jv\", \"name\": \"https://github.com/jumpserver/jumpserver/security/advisories/GHSA-jv3c-27cv-w8jv\", \"tags\": [\"x_refsource_CONFIRM\", \"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T19:30:24.806Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2023-42818\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-23T18:52:26.646507Z\"}}}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:jumpserver:jumpserver:*:*:*:*:*:*:*:*\"], \"vendor\": \"jumpserver\", \"product\": \"jumpserver\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.6.0\", \"lessThan\": \"3.6.5\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"3.5.6\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-23T19:02:00.404Z\"}}], \"cna\": {\"title\": \"SSH public key login without private key challenge if mfa is enabled in jumpserver\", \"source\": {\"advisory\": \"GHSA-jv3c-27cv-w8jv\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.4, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L\", \"integrityImpact\": \"LOW\", \"userInteraction\": \"REQUIRED\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"LOW\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"jumpserver\", \"product\": \"jumpserver\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003e= 3.6.0, \u003c 3.6.5\"}, {\"status\": \"affected\", \"version\": \"\u003c 3.5.6\"}]}], \"references\": [{\"url\": \"https://github.com/jumpserver/jumpserver/security/advisories/GHSA-jv3c-27cv-w8jv\", \"name\": \"https://github.com/jumpserver/jumpserver/security/advisories/GHSA-jv3c-27cv-w8jv\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://www.sonarsource.com/blog/diving-into-jumpserver-attackers-gateway-to-internal-networks-1-2\", \"name\": \"https://www.sonarsource.com/blog/diving-into-jumpserver-attackers-gateway-to-internal-networks-1-2\", \"tags\": [\"x_refsource_MISC\"]}], \"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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-287\", \"description\": \"CWE-287: Improper Authentication\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2025-03-25T19:28:32.560Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-42818\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-03-25T19:28:32.560Z\", \"dateReserved\": \"2023-09-14T16:13:33.309Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2023-09-27T20:28:30.507Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.