USN-5174-1 (UBUNTU-CVE-2016-2124)

Vulnerability from osv_ubuntu – Published: 2021-12-06 13:29 – Updated: 2026-04-27 14:11 – Source website
VLAI
Summary
samba vulnerabilities
Details

Stefan Metzmacher discovered that Samba incorrectly handled SMB1 client connections. A remote attacker could possibly use this issue to downgrade connections to plaintext authentication. (CVE-2016-2124)

Andrew Bartlett discovered that Samba incorrectly mapping domain users to local users. An authenticated attacker could possibly use this issue to become root on domain members. (CVE-2020-25717)

Andrew Bartlett discovered that Samba did not properly check sensitive attributes. An authenticated attacker could possibly use this issue to escalate privileges. (CVE-2020-25722)

Joseph Sutton discovered that Samba incorrectly handled certain TGS requests. An authenticated attacker could possibly use this issue to cause Samba to crash, resulting in a denial of service. (CVE-2021-3671)

The fix for CVE-2020-25717 results in possible behaviour changes that could affect certain environments. Please see the upstream advisory for more information:

https://www.samba.org/samba/security/CVE-2020-25717.html

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2016-2124",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2020-25717",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2020-25722",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-3671",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "ctdb",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.26"
          },
          {
            "binary_name": "libnss-winbind",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.26"
          },
          {
            "binary_name": "libpam-winbind",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.26"
          },
          {
            "binary_name": "libparse-pidl-perl",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.26"
          },
          {
            "binary_name": "libsmbclient",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.26"
          },
          {
            "binary_name": "libwbclient0",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.26"
          },
          {
            "binary_name": "python-samba",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.26"
          },
          {
            "binary_name": "registry-tools",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.26"
          },
          {
            "binary_name": "samba",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.26"
          },
          {
            "binary_name": "samba-common",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.26"
          },
          {
            "binary_name": "samba-common-bin",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.26"
          },
          {
            "binary_name": "samba-dsdb-modules",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.26"
          },
          {
            "binary_name": "samba-libs",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.26"
          },
          {
            "binary_name": "samba-testsuite",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.26"
          },
          {
            "binary_name": "samba-vfs-modules",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.26"
          },
          {
            "binary_name": "smbclient",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.26"
          },
          {
            "binary_name": "winbind",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.26"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "samba",
        "purl": "pkg:deb/ubuntu/samba@2:4.7.6+dfsg~ubuntu-0ubuntu2.26?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:4.7.6+dfsg~ubuntu-0ubuntu2.26"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:4.6.7+dfsg-1ubuntu3",
        "2:4.7.1+dfsg-1ubuntu1",
        "2:4.7.3+dfsg-1ubuntu1",
        "2:4.7.4+dfsg-1ubuntu1",
        "2:4.7.6+dfsg~ubuntu-0ubuntu1",
        "2:4.7.6+dfsg~ubuntu-0ubuntu2",
        "2:4.7.6+dfsg~ubuntu-0ubuntu2.2",
        "2:4.7.6+dfsg~ubuntu-0ubuntu2.4",
        "2:4.7.6+dfsg~ubuntu-0ubuntu2.5",
        "2:4.7.6+dfsg~ubuntu-0ubuntu2.6",
        "2:4.7.6+dfsg~ubuntu-0ubuntu2.7",
        "2:4.7.6+dfsg~ubuntu-0ubuntu2.9",
        "2:4.7.6+dfsg~ubuntu-0ubuntu2.10",
        "2:4.7.6+dfsg~ubuntu-0ubuntu2.11",
        "2:4.7.6+dfsg~ubuntu-0ubuntu2.13",
        "2:4.7.6+dfsg~ubuntu-0ubuntu2.14",
        "2:4.7.6+dfsg~ubuntu-0ubuntu2.15",
        "2:4.7.6+dfsg~ubuntu-0ubuntu2.16",
        "2:4.7.6+dfsg~ubuntu-0ubuntu2.17",
        "2:4.7.6+dfsg~ubuntu-0ubuntu2.18",
        "2:4.7.6+dfsg~ubuntu-0ubuntu2.19",
        "2:4.7.6+dfsg~ubuntu-0ubuntu2.20",
        "2:4.7.6+dfsg~ubuntu-0ubuntu2.21",
        "2:4.7.6+dfsg~ubuntu-0ubuntu2.23",
        "2:4.7.6+dfsg~ubuntu-0ubuntu2.24"
      ]
    }
  ],
  "aliases": [],
  "details": "Stefan Metzmacher discovered that Samba incorrectly handled SMB1 client\nconnections. A remote attacker could possibly use this issue to downgrade\nconnections to plaintext authentication. (CVE-2016-2124)\n\nAndrew Bartlett discovered that Samba incorrectly mapping domain users to\nlocal users. An authenticated attacker could possibly use this issue to\nbecome root on domain members. (CVE-2020-25717)\n\nAndrew Bartlett discovered that Samba did not properly check sensitive\nattributes. An authenticated attacker could possibly use this issue to\nescalate privileges. (CVE-2020-25722)\n\nJoseph Sutton discovered that Samba incorrectly handled certain TGS\nrequests. An authenticated attacker could possibly use this issue to cause\nSamba to crash, resulting in a denial of service. (CVE-2021-3671)\n\nThe fix for CVE-2020-25717 results in possible behaviour changes that could\naffect certain environments. Please see the upstream advisory for more\ninformation:\n\nhttps://www.samba.org/samba/security/CVE-2020-25717.html\n",
  "id": "USN-5174-1",
  "modified": "2026-04-27T14:11:27Z",
  "published": "2021-12-06T13:29:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5174-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2016-2124"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-25717"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-25722"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3671"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "samba vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2016-2124",
    "UBUNTU-CVE-2020-25717",
    "UBUNTU-CVE-2020-25722",
    "UBUNTU-CVE-2021-3671"
  ]
}



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