ubuntu-cve-2018-5709
Vulnerability from osv_ubuntu
Published
2018-01-16 09:29
Modified
2026-05-29 10:24
Summary
Details

An issue was discovered in MIT Kerberos 5 (aka krb5) through 1.16. There is a variable "dbentry->n_key_data" in kadmin/dbutil/dump.c that can store 16-bit data but unknowingly the developer has assigned a "u4" variable to it, which is for 32-bit data. An attacker can use this vulnerability to affect other artifacts of the database as we know that a Kerberos database dump file contains trusted data.

Severity
7.5 (High)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
N/A (UNKNOWN)
negligible
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "krb5-admin-server",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
          },
          {
            "binary_name": "krb5-gss-samples",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
          },
          {
            "binary_name": "krb5-kdc",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
          },
          {
            "binary_name": "krb5-kdc-ldap",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
          },
          {
            "binary_name": "krb5-locales",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
          },
          {
            "binary_name": "krb5-multidev",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
          },
          {
            "binary_name": "krb5-otp",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
          },
          {
            "binary_name": "krb5-pkinit",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
          },
          {
            "binary_name": "krb5-user",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
          },
          {
            "binary_name": "libgssapi-krb5-2",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
          },
          {
            "binary_name": "libgssrpc4",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
          },
          {
            "binary_name": "libk5crypto3",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
          },
          {
            "binary_name": "libkadm5clnt-mit9",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
          },
          {
            "binary_name": "libkadm5srv-mit8",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
          },
          {
            "binary_name": "libkadm5srv-mit9",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
          },
          {
            "binary_name": "libkdb5-7",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
          },
          {
            "binary_name": "libkrad0",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
          },
          {
            "binary_name": "libkrb5-3",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
          },
          {
            "binary_name": "libkrb5support0",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "krb5",
        "purl": "pkg:deb/ubuntu/krb5@1.12+dfsg-2ubuntu5.4+esm7?arch=source\u0026distro=esm-infra-legacy/trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.10.1+dfsg-6.1ubuntu1",
        "1.11.3+dfsg-3ubuntu2",
        "1.12+dfsg-2ubuntu1",
        "1.12+dfsg-2ubuntu2",
        "1.12+dfsg-2ubuntu3",
        "1.12+dfsg-2ubuntu4",
        "1.12+dfsg-2ubuntu4.2",
        "1.12+dfsg-2ubuntu5",
        "1.12+dfsg-2ubuntu5.1",
        "1.12+dfsg-2ubuntu5.2",
        "1.12+dfsg-2ubuntu5.3",
        "1.12+dfsg-2ubuntu5.4",
        "1.12+dfsg-2ubuntu5.4+esm1",
        "1.12+dfsg-2ubuntu5.4+esm2",
        "1.12+dfsg-2ubuntu5.4+esm3",
        "1.12+dfsg-2ubuntu5.4+esm4",
        "1.12+dfsg-2ubuntu5.4+esm5",
        "1.12+dfsg-2ubuntu5.4+esm6",
        "1.12+dfsg-2ubuntu5.4+esm7"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "krb5-admin-server",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
          },
          {
            "binary_name": "krb5-gss-samples",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
          },
          {
            "binary_name": "krb5-k5tls",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
          },
          {
            "binary_name": "krb5-kdc",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
          },
          {
            "binary_name": "krb5-kdc-ldap",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
          },
          {
            "binary_name": "krb5-locales",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
          },
          {
            "binary_name": "krb5-multidev",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
          },
          {
            "binary_name": "krb5-otp",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
          },
          {
            "binary_name": "krb5-pkinit",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
          },
          {
            "binary_name": "krb5-user",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
          },
          {
            "binary_name": "libgssapi-krb5-2",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
          },
          {
            "binary_name": "libgssrpc4",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
          },
          {
            "binary_name": "libk5crypto3",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
          },
          {
            "binary_name": "libkadm5clnt-mit9",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
          },
          {
            "binary_name": "libkadm5srv-mit9",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
          },
          {
            "binary_name": "libkdb5-8",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
          },
          {
            "binary_name": "libkrad0",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
          },
          {
            "binary_name": "libkrb5-3",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
          },
          {
            "binary_name": "libkrb5support0",
            "binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "krb5",
        "purl": "pkg:deb/ubuntu/krb5@1.13.2+dfsg-5ubuntu2.2+esm7?arch=source\u0026distro=esm-infra/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.13.2+dfsg-2",
        "1.13.2+dfsg-3",
        "1.13.2+dfsg-4",
        "1.13.2+dfsg-5",
        "1.13.2+dfsg-5ubuntu1",
        "1.13.2+dfsg-5ubuntu2",
        "1.13.2+dfsg-5ubuntu2.1",
        "1.13.2+dfsg-5ubuntu2.1+esm1",
        "1.13.2+dfsg-5ubuntu2.2",
        "1.13.2+dfsg-5ubuntu2.2+esm1",
        "1.13.2+dfsg-5ubuntu2.2+esm2",
        "1.13.2+dfsg-5ubuntu2.2+esm3",
        "1.13.2+dfsg-5ubuntu2.2+esm4",
        "1.13.2+dfsg-5ubuntu2.2+esm5",
        "1.13.2+dfsg-5ubuntu2.2+esm6",
        "1.13.2+dfsg-5ubuntu2.2+esm7"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "krb5-admin-server",
            "binary_version": "1.16-2ubuntu0.4+esm5"
          },
          {
            "binary_name": "krb5-gss-samples",
            "binary_version": "1.16-2ubuntu0.4+esm5"
          },
          {
            "binary_name": "krb5-k5tls",
            "binary_version": "1.16-2ubuntu0.4+esm5"
          },
          {
            "binary_name": "krb5-kdc",
            "binary_version": "1.16-2ubuntu0.4+esm5"
          },
          {
            "binary_name": "krb5-kdc-ldap",
            "binary_version": "1.16-2ubuntu0.4+esm5"
          },
          {
            "binary_name": "krb5-kpropd",
            "binary_version": "1.16-2ubuntu0.4+esm5"
          },
          {
            "binary_name": "krb5-locales",
            "binary_version": "1.16-2ubuntu0.4+esm5"
          },
          {
            "binary_name": "krb5-multidev",
            "binary_version": "1.16-2ubuntu0.4+esm5"
          },
          {
            "binary_name": "krb5-otp",
            "binary_version": "1.16-2ubuntu0.4+esm5"
          },
          {
            "binary_name": "krb5-pkinit",
            "binary_version": "1.16-2ubuntu0.4+esm5"
          },
          {
            "binary_name": "krb5-user",
            "binary_version": "1.16-2ubuntu0.4+esm5"
          },
          {
            "binary_name": "libgssapi-krb5-2",
            "binary_version": "1.16-2ubuntu0.4+esm5"
          },
          {
            "binary_name": "libgssrpc4",
            "binary_version": "1.16-2ubuntu0.4+esm5"
          },
          {
            "binary_name": "libk5crypto3",
            "binary_version": "1.16-2ubuntu0.4+esm5"
          },
          {
            "binary_name": "libkadm5clnt-mit11",
            "binary_version": "1.16-2ubuntu0.4+esm5"
          },
          {
            "binary_name": "libkadm5srv-mit11",
            "binary_version": "1.16-2ubuntu0.4+esm5"
          },
          {
            "binary_name": "libkdb5-9",
            "binary_version": "1.16-2ubuntu0.4+esm5"
          },
          {
            "binary_name": "libkrad0",
            "binary_version": "1.16-2ubuntu0.4+esm5"
          },
          {
            "binary_name": "libkrb5-3",
            "binary_version": "1.16-2ubuntu0.4+esm5"
          },
          {
            "binary_name": "libkrb5support0",
            "binary_version": "1.16-2ubuntu0.4+esm5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "krb5",
        "purl": "pkg:deb/ubuntu/krb5@1.16-2ubuntu0.4+esm5?arch=source\u0026distro=esm-infra/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.15.1-2",
        "1.16-2",
        "1.16-2build1",
        "1.16-2ubuntu0.1",
        "1.16-2ubuntu0.1+esm1",
        "1.16-2ubuntu0.2",
        "1.16-2ubuntu0.3",
        "1.16-2ubuntu0.4",
        "1.16-2ubuntu0.4+esm1",
        "1.16-2ubuntu0.4+esm2",
        "1.16-2ubuntu0.4+esm3",
        "1.16-2ubuntu0.4+esm5"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "krb5-admin-server",
            "binary_version": "1.17-6ubuntu4.11"
          },
          {
            "binary_name": "krb5-gss-samples",
            "binary_version": "1.17-6ubuntu4.11"
          },
          {
            "binary_name": "krb5-k5tls",
            "binary_version": "1.17-6ubuntu4.11"
          },
          {
            "binary_name": "krb5-kdc",
            "binary_version": "1.17-6ubuntu4.11"
          },
          {
            "binary_name": "krb5-kdc-ldap",
            "binary_version": "1.17-6ubuntu4.11"
          },
          {
            "binary_name": "krb5-kpropd",
            "binary_version": "1.17-6ubuntu4.11"
          },
          {
            "binary_name": "krb5-locales",
            "binary_version": "1.17-6ubuntu4.11"
          },
          {
            "binary_name": "krb5-multidev",
            "binary_version": "1.17-6ubuntu4.11"
          },
          {
            "binary_name": "krb5-otp",
            "binary_version": "1.17-6ubuntu4.11"
          },
          {
            "binary_name": "krb5-pkinit",
            "binary_version": "1.17-6ubuntu4.11"
          },
          {
            "binary_name": "krb5-user",
            "binary_version": "1.17-6ubuntu4.11"
          },
          {
            "binary_name": "libgssapi-krb5-2",
            "binary_version": "1.17-6ubuntu4.11"
          },
          {
            "binary_name": "libgssrpc4",
            "binary_version": "1.17-6ubuntu4.11"
          },
          {
            "binary_name": "libk5crypto3",
            "binary_version": "1.17-6ubuntu4.11"
          },
          {
            "binary_name": "libkadm5clnt-mit11",
            "binary_version": "1.17-6ubuntu4.11"
          },
          {
            "binary_name": "libkadm5srv-mit11",
            "binary_version": "1.17-6ubuntu4.11"
          },
          {
            "binary_name": "libkdb5-9",
            "binary_version": "1.17-6ubuntu4.11"
          },
          {
            "binary_name": "libkrad0",
            "binary_version": "1.17-6ubuntu4.11"
          },
          {
            "binary_name": "libkrb5-3",
            "binary_version": "1.17-6ubuntu4.11"
          },
          {
            "binary_name": "libkrb5support0",
            "binary_version": "1.17-6ubuntu4.11"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "krb5",
        "purl": "pkg:deb/ubuntu/krb5@1.17-6ubuntu4.11?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.17-6",
        "1.17-6ubuntu3",
        "1.17-6ubuntu4",
        "1.17-6ubuntu4.1",
        "1.17-6ubuntu4.2",
        "1.17-6ubuntu4.3",
        "1.17-6ubuntu4.4",
        "1.17-6ubuntu4.6",
        "1.17-6ubuntu4.7",
        "1.17-6ubuntu4.8",
        "1.17-6ubuntu4.9",
        "1.17-6ubuntu4.11"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "krb5-admin-server",
            "binary_version": "1.19.2-2ubuntu0.7"
          },
          {
            "binary_name": "krb5-gss-samples",
            "binary_version": "1.19.2-2ubuntu0.7"
          },
          {
            "binary_name": "krb5-k5tls",
            "binary_version": "1.19.2-2ubuntu0.7"
          },
          {
            "binary_name": "krb5-kdc",
            "binary_version": "1.19.2-2ubuntu0.7"
          },
          {
            "binary_name": "krb5-kdc-ldap",
            "binary_version": "1.19.2-2ubuntu0.7"
          },
          {
            "binary_name": "krb5-kpropd",
            "binary_version": "1.19.2-2ubuntu0.7"
          },
          {
            "binary_name": "krb5-locales",
            "binary_version": "1.19.2-2ubuntu0.7"
          },
          {
            "binary_name": "krb5-multidev",
            "binary_version": "1.19.2-2ubuntu0.7"
          },
          {
            "binary_name": "krb5-otp",
            "binary_version": "1.19.2-2ubuntu0.7"
          },
          {
            "binary_name": "krb5-pkinit",
            "binary_version": "1.19.2-2ubuntu0.7"
          },
          {
            "binary_name": "krb5-user",
            "binary_version": "1.19.2-2ubuntu0.7"
          },
          {
            "binary_name": "libgssapi-krb5-2",
            "binary_version": "1.19.2-2ubuntu0.7"
          },
          {
            "binary_name": "libgssrpc4",
            "binary_version": "1.19.2-2ubuntu0.7"
          },
          {
            "binary_name": "libk5crypto3",
            "binary_version": "1.19.2-2ubuntu0.7"
          },
          {
            "binary_name": "libkadm5clnt-mit12",
            "binary_version": "1.19.2-2ubuntu0.7"
          },
          {
            "binary_name": "libkadm5srv-mit12",
            "binary_version": "1.19.2-2ubuntu0.7"
          },
          {
            "binary_name": "libkdb5-10",
            "binary_version": "1.19.2-2ubuntu0.7"
          },
          {
            "binary_name": "libkrad0",
            "binary_version": "1.19.2-2ubuntu0.7"
          },
          {
            "binary_name": "libkrb5-3",
            "binary_version": "1.19.2-2ubuntu0.7"
          },
          {
            "binary_name": "libkrb5support0",
            "binary_version": "1.19.2-2ubuntu0.7"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "krb5",
        "purl": "pkg:deb/ubuntu/krb5@1.19.2-2ubuntu0.7?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.18.3-6",
        "1.18.3-7",
        "1.19.2-0ubuntu1",
        "1.19.2-1",
        "1.19.2-2",
        "1.19.2-2ubuntu0.1",
        "1.19.2-2ubuntu0.2",
        "1.19.2-2ubuntu0.3",
        "1.19.2-2ubuntu0.4",
        "1.19.2-2ubuntu0.5",
        "1.19.2-2ubuntu0.6",
        "1.19.2-2ubuntu0.7"
      ]
    }
  ],
  "aliases": [],
  "details": "An issue was discovered in MIT Kerberos 5 (aka krb5) through 1.16. There is a variable \"dbentry-\u003en_key_data\" in kadmin/dbutil/dump.c that can store 16-bit data but unknowingly the developer has assigned a \"u4\" variable to it, which is for 32-bit data. An attacker can use this vulnerability to affect other artifacts of the database as we know that a Kerberos database dump file contains trusted data.",
  "id": "UBUNTU-CVE-2018-5709",
  "modified": "2026-05-29T10:24:22Z",
  "published": "2018-01-16T09:29:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2018-5709"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/poojamnit/Kerberos-V5-1.16-Vulnerabilities/tree/master/Integer%20Overflow"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2018-5709"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "negligible",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2018-5709"
  ]
}



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