{
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              "x_transferred"
            ],
            "url": "https://kb.isc.org/docs/aa-01565"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "ISC DHCP",
          "vendor": "ISC",
          "versions": [
            {
              "status": "affected",
              "version": "ISC DHCP 4.1.0 -\u003e 4.1-ESV-R15, 4.2.0 -\u003e 4.2.8, 4.3.0 -\u003e 4.3.6, 4.4.0"
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          ]
        }
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      "credits": [
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          "lang": "en",
          "value": "ISC would like to thank Felix Wilhelm, Google Security Team, for reporting this vulnerability."
        }
      ],
      "datePublic": "2018-02-28T00:00:00.000Z",
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          "lang": "en",
          "value": "Failure to properly bounds-check a buffer used for processing DHCP options allows a malicious server (or an entity masquerading as a server) to cause a buffer overflow (and resulting crash) in dhclient by sending a response containing a specially constructed options section. Affects ISC DHCP versions 4.1.0 -\u003e 4.1-ESV-R15, 4.2.0 -\u003e 4.2.8, 4.3.0 -\u003e 4.3.6, 4.4.0"
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              "description": "Affected versions of dhclient should crash due to an out-of-bounds memory access if they receive and process a triggering response packet. However, buffer overflow outcomes can vary by operating system, and outcomes such as remote code execution may be possible in some circumstances. Where they are present, operating system mitigation strategies such as address space layout randomization (ASLR) should make it difficult to leverage this vulnerability to achieve remote code execution, but we cannot rule it out as impossible. The safest course is to patch dhclient so that the buffer overflow cannot occur.",
              "lang": "en",
              "type": "text"
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      ],
      "providerMetadata": {
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          "url": "https://kb.isc.org/docs/aa-01565"
        }
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      "solutions": [
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          "lang": "en",
          "value": "Upgrade to the patched release most closely related to your current version of DHCP. ISC DHCP releases are available from https://www.isc.org/downloads.\n\n \u003e=   DHCP 4.1-ESV-R15-P1\n \u003e=   DHCP 4.3.6-P1\n \u003e=   DHCP 4.4.1"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "A specially constructed response from a malicious server can cause a buffer overflow in dhclient",
      "x_legacyV4Record": {
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          "ASSIGNER": "security-officer@isc.org",
          "DATE_PUBLIC": "2018-02-28T00:00:00.000Z",
          "ID": "CVE-2018-5732",
          "STATE": "PUBLIC",
          "TITLE": "A specially constructed response from a malicious server can cause a buffer overflow in dhclient"
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                            "version_value": "4.1.0 -\u003e 4.1-ESV-R15, 4.2.0 -\u003e 4.2.8, 4.3.0 -\u003e 4.3.6, 4.4.0"
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        "credit": [
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            "lang": "eng",
            "value": "ISC would like to thank Felix Wilhelm, Google Security Team, for reporting this vulnerability."
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                }
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            "lang": "en",
            "value": "Upgrade to the patched release most closely related to your current version of DHCP. ISC DHCP releases are available from https://www.isc.org/downloads.\n\n \u003e=   DHCP 4.1-ESV-R15-P1\n \u003e=   DHCP 4.3.6-P1\n \u003e=   DHCP 4.4.1"
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    "datePublished": "2019-10-09T14:17:14.251Z",
    "dateReserved": "2018-01-17T00:00:00.000Z",
    "dateUpdated": "2024-09-16T18:19:36.136Z",
    "state": "PUBLISHED"
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{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2016-2774",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2017-3144",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2018-5732",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2018-5733",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:14.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "isc-dhcp-client",
            "binary_version": "4.2.4-7ubuntu12.12"
          },
          {
            "binary_name": "isc-dhcp-client-noddns",
            "binary_version": "4.2.4-7ubuntu12.12"
          },
          {
            "binary_name": "isc-dhcp-common",
            "binary_version": "4.2.4-7ubuntu12.12"
          },
          {
            "binary_name": "isc-dhcp-relay",
            "binary_version": "4.2.4-7ubuntu12.12"
          },
          {
            "binary_name": "isc-dhcp-server",
            "binary_version": "4.2.4-7ubuntu12.12"
          },
          {
            "binary_name": "isc-dhcp-server-ldap",
            "binary_version": "4.2.4-7ubuntu12.12"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:14.04:LTS",
        "name": "isc-dhcp",
        "purl": "pkg:deb/ubuntu/isc-dhcp@4.2.4-7ubuntu12.12?arch=source\u0026distro=trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.2.4-7ubuntu12.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.2.4-7ubuntu8",
        "4.2.4-7ubuntu9",
        "4.2.4-7ubuntu10",
        "4.2.4-7ubuntu11",
        "4.2.4-7ubuntu12",
        "4.2.4-7ubuntu12.1",
        "4.2.4-7ubuntu12.2",
        "4.2.4-7ubuntu12.3",
        "4.2.4-7ubuntu12.4",
        "4.2.4-7ubuntu12.5",
        "4.2.4-7ubuntu12.6",
        "4.2.4-7ubuntu12.7",
        "4.2.4-7ubuntu12.8",
        "4.2.4-7ubuntu12.9",
        "4.2.4-7ubuntu12.10"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2016-2774",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2017-3144",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2018-5732",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2018-5733",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:16.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "isc-dhcp-client",
            "binary_version": "4.3.3-5ubuntu12.9"
          },
          {
            "binary_name": "isc-dhcp-client-ddns",
            "binary_version": "4.3.3-5ubuntu12.9"
          },
          {
            "binary_name": "isc-dhcp-common",
            "binary_version": "4.3.3-5ubuntu12.9"
          },
          {
            "binary_name": "isc-dhcp-relay",
            "binary_version": "4.3.3-5ubuntu12.9"
          },
          {
            "binary_name": "isc-dhcp-server",
            "binary_version": "4.3.3-5ubuntu12.9"
          },
          {
            "binary_name": "isc-dhcp-server-ldap",
            "binary_version": "4.3.3-5ubuntu12.9"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "isc-dhcp",
        "purl": "pkg:deb/ubuntu/isc-dhcp@4.3.3-5ubuntu12.9?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.3.3-5ubuntu12.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.3.1-5ubuntu3",
        "4.3.1-5ubuntu4",
        "4.3.1-5ubuntu5",
        "4.3.3-5ubuntu1",
        "4.3.3-5ubuntu2",
        "4.3.3-5ubuntu4",
        "4.3.3-5ubuntu5",
        "4.3.3-5ubuntu7",
        "4.3.3-5ubuntu8",
        "4.3.3-5ubuntu9",
        "4.3.3-5ubuntu10",
        "4.3.3-5ubuntu11",
        "4.3.3-5ubuntu12",
        "4.3.3-5ubuntu12.1",
        "4.3.3-5ubuntu12.3",
        "4.3.3-5ubuntu12.4",
        "4.3.3-5ubuntu12.6",
        "4.3.3-5ubuntu12.7"
      ]
    }
  ],
  "aliases": [],
  "details": "Konstantin Orekhov discovered that the DHCP server incorrectly handled a\nlarge number of concurrent TCP sessions. A remote attacker could possibly\nuse this issue to cause a denial of service. This issue only affected\nUbuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-2774)\n\nIt was discovered that the DHCP server incorrectly handled socket\ndescriptors. A remote attacker could possibly use this issue to cause a\ndenial of service. (CVE-2017-3144)\n\nFelix Wilhelm discovered that the DHCP client incorrectly handled certain\nmalformed responses. A remote attacker could use this issue to cause the\nDHCP client to crash, resulting in a denial of service, or possibly execute\narbitrary code. In the default installation, attackers would be isolated by\nthe dhclient AppArmor profile. (CVE-2018-5732)\n\nFelix Wilhelm discovered that the DHCP server incorrectly handled reference\ncounting. A remote attacker could possibly use this issue to cause the DHCP\nserver to crash, resulting in a denial of service. (CVE-2018-5733)\n",
  "id": "USN-3586-1",
  "modified": "2026-04-22T07:36:35Z",
  "published": "2018-03-01T17:47:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-3586-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2016-2774"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2017-3144"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2018-5732"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2018-5733"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "isc-dhcp vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2016-2774",
    "UBUNTU-CVE-2017-3144",
    "UBUNTU-CVE-2018-5732",
    "UBUNTU-CVE-2018-5733"
  ]
}