FKIE_CVE-2018-15599

Vulnerability from fkie_nvd - Published: 2018-08-21 01:29 - Updated: 2026-06-17 01:42
Severity
5.3 (Medium) - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Summary
The recv_msg_userauth_request function in svr-auth.c in Dropbear through 2018.76 is prone to a user enumeration vulnerability because username validity affects how fields in SSH_MSG_USERAUTH messages are handled, a similar issue to CVE-2018-15473 in an unrelated codebase.
References
cve@mitre.orghttp://lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2018q3/002108.htmlMailing List, Third Party Advisory
cve@mitre.orghttp://lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2018q3/002109.htmlMailing List, Third Party Advisory
cve@mitre.orghttps://lists.debian.org/debian-lts-announce/2018/08/msg00026.htmlMailing List, Third Party Advisory
cve@mitre.orghttps://matt.ucc.asn.au/dropbear/CHANGES
cve@mitre.orghttps://old.reddit.com/r/blackhat/comments/97ywnm/openssh_username_enumeration/e4e05n2/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2018q3/002108.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2018q3/002109.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2018/08/msg00026.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://matt.ucc.asn.au/dropbear/CHANGES
af854a3a-2127-422b-91ae-364da2661108https://old.reddit.com/r/blackhat/comments/97ywnm/openssh_username_enumeration/e4e05n2/Third Party Advisory
Impacted products
Vendor Product Version
debian debian_linux 8.0
dropbear_ssh_project dropbear_ssh *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "configurations": [
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              "vulnerable": true
            }
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              "matchCriteriaId": "1967F3CC-83D8-4867-AC55-EE54A12E0332",
              "versionEndIncluding": "2018.76",
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The recv_msg_userauth_request function in svr-auth.c in Dropbear through 2018.76 is prone to a user enumeration vulnerability because username validity affects how fields in SSH_MSG_USERAUTH messages are handled, a similar issue to CVE-2018-15473 in an unrelated codebase."
    },
    {
      "lang": "es",
      "value": "La funci\u00f3n recv_msg_userauth_request en svr-auth.c en Dropbear hasta la versi\u00f3n 2018.76 es propensa a una vulnerabilidad de enumeraci\u00f3n de usuarios porque la validez de los nombres de usuarios afecta a c\u00f3mo se manejan los campos en los mensajes SSH_MSG_USERAUTH. Este problema es similar a CVE-2018-15473 en una base de c\u00f3digo no relacionada."
    }
  ],
  "id": "CVE-2018-15599",
  "lastModified": "2026-06-17T01:42:49.183",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 5.0,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N",
          "version": "2.0"
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        "exploitabilityScore": 10.0,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
          "version": "3.0"
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        "impactScore": 1.4,
        "source": "nvd@nist.gov",
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  },
  "published": "2018-08-21T01:29:00.350",
  "references": [
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      "source": "cve@mitre.org",
      "tags": [
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    },
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  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
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      "description": [
        {
          "lang": "en",
          "value": "CWE-200"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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