usn-4931-1
Vulnerability from osv_ubuntu
Published
2021-05-03 20:44
Modified
2026-06-29 10:52
Summary
samba vulnerabilities
Details

Steven French discovered that Samba incorrectly handled ChangeNotify permissions. A remote attacker could possibly use this issue to obtain file name information. (CVE-2020-14318)

Bas Alberts discovered that Samba incorrectly handled certain winbind requests. A remote attacker could possibly use this issue to cause winbind to crash, resulting in a denial of service. (CVE-2020-14323)

Francis Brosnan Blázquez discovered that Samba incorrectly handled certain invalid DNS records. A remote attacker could possibly use this issue to cause the DNS server to crash, resulting in a denial of service. (CVE-2020-14383)

Peter Eriksson discovered that Samba incorrectly handled certain negative idmap cache entries. This issue could result in certain users gaining unauthorized access to files, contrary to expected behaviour. (CVE-2021-20254)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2020-14318",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2020-14323",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2020-14383",
              "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": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-20254",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:14.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libnss-winbind",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11"
          },
          {
            "binary_name": "libpam-smbpass",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11"
          },
          {
            "binary_name": "libpam-winbind",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11"
          },
          {
            "binary_name": "libparse-pidl-perl",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11"
          },
          {
            "binary_name": "libsmbclient",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11"
          },
          {
            "binary_name": "libsmbsharemodes0",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11"
          },
          {
            "binary_name": "libwbclient0",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11"
          },
          {
            "binary_name": "python-samba",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11"
          },
          {
            "binary_name": "registry-tools",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11"
          },
          {
            "binary_name": "samba",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11"
          },
          {
            "binary_name": "samba-common",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11"
          },
          {
            "binary_name": "samba-common-bin",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11"
          },
          {
            "binary_name": "samba-dsdb-modules",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11"
          },
          {
            "binary_name": "samba-libs",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11"
          },
          {
            "binary_name": "samba-testsuite",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11"
          },
          {
            "binary_name": "samba-vfs-modules",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11"
          },
          {
            "binary_name": "smbclient",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11"
          },
          {
            "binary_name": "winbind",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "samba",
        "purl": "pkg:deb/ubuntu/samba@2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11?arch=source\u0026distro=trusty/esm"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:3.6.18-1ubuntu3",
        "2:4.0.10+dfsg-4ubuntu2",
        "2:4.0.13+dfsg-1ubuntu1",
        "2:4.1.3+dfsg-2ubuntu2",
        "2:4.1.3+dfsg-2ubuntu3",
        "2:4.1.3+dfsg-2ubuntu4",
        "2:4.1.3+dfsg-2ubuntu5",
        "2:4.1.6+dfsg-1ubuntu1",
        "2:4.1.6+dfsg-1ubuntu2",
        "2:4.1.6+dfsg-1ubuntu2.14.04.1",
        "2:4.1.6+dfsg-1ubuntu2.14.04.2",
        "2:4.1.6+dfsg-1ubuntu2.14.04.3",
        "2:4.1.6+dfsg-1ubuntu2.14.04.4",
        "2:4.1.6+dfsg-1ubuntu2.14.04.5",
        "2:4.1.6+dfsg-1ubuntu2.14.04.7",
        "2:4.1.6+dfsg-1ubuntu2.14.04.8",
        "2:4.1.6+dfsg-1ubuntu2.14.04.9",
        "2:4.1.6+dfsg-1ubuntu2.14.04.11",
        "2:4.1.6+dfsg-1ubuntu2.14.04.12",
        "2:4.1.6+dfsg-1ubuntu2.14.04.13",
        "2:4.3.8+dfsg-0ubuntu0.14.04.2",
        "2:4.3.9+dfsg-0ubuntu0.14.04.1",
        "2:4.3.9+dfsg-0ubuntu0.14.04.3",
        "2:4.3.11+dfsg-0ubuntu0.14.04.1",
        "2:4.3.11+dfsg-0ubuntu0.14.04.2",
        "2:4.3.11+dfsg-0ubuntu0.14.04.3",
        "2:4.3.11+dfsg-0ubuntu0.14.04.4",
        "2:4.3.11+dfsg-0ubuntu0.14.04.6",
        "2:4.3.11+dfsg-0ubuntu0.14.04.7",
        "2:4.3.11+dfsg-0ubuntu0.14.04.8",
        "2:4.3.11+dfsg-0ubuntu0.14.04.9",
        "2:4.3.11+dfsg-0ubuntu0.14.04.10",
        "2:4.3.11+dfsg-0ubuntu0.14.04.11",
        "2:4.3.11+dfsg-0ubuntu0.14.04.12",
        "2:4.3.11+dfsg-0ubuntu0.14.04.13",
        "2:4.3.11+dfsg-0ubuntu0.14.04.14",
        "2:4.3.11+dfsg-0ubuntu0.14.04.16",
        "2:4.3.11+dfsg-0ubuntu0.14.04.17",
        "2:4.3.11+dfsg-0ubuntu0.14.04.19",
        "2:4.3.11+dfsg-0ubuntu0.14.04.20",
        "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm1",
        "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm2",
        "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm3",
        "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4",
        "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm6",
        "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm7",
        "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm8",
        "2:4.3.11+dfsg-0ubuntu0.14.04.20+esm9"
      ]
    }
  ],
  "aliases": [],
  "details": "Steven French discovered that Samba incorrectly handled ChangeNotify\npermissions. A remote attacker could possibly use this issue to obtain file\nname information. (CVE-2020-14318)\n\nBas Alberts discovered that Samba incorrectly handled certain winbind\nrequests. A remote attacker could possibly use this issue to cause winbind\nto crash, resulting in a denial of service. (CVE-2020-14323)\n\nFrancis Brosnan Bl\u00e1zquez discovered that Samba incorrectly handled certain\ninvalid DNS records. A remote attacker could possibly use this issue to\ncause the DNS server to crash, resulting in a denial of service.\n(CVE-2020-14383)\n\nPeter Eriksson discovered that Samba incorrectly handled certain negative\nidmap cache entries. This issue could result in certain users gaining\nunauthorized access to files, contrary to expected behaviour.\n(CVE-2021-20254)\n",
  "id": "USN-4931-1",
  "modified": "2026-06-29T10:52:49Z",
  "published": "2021-05-03T20:44:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4931-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-14318"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-14323"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-14383"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-20254"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "samba vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2020-14318",
    "UBUNTU-CVE-2020-14323",
    "UBUNTU-CVE-2020-14383",
    "UBUNTU-CVE-2021-20254"
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.