Vulnerability-Lookup

UBUNTU-CVE-2021-20254 (CVE-2021-20254)

Vulnerability from osv_ubuntu – Published: 2021-04-29 00:00 – Updated: 2026-04-22 07:39 – Source website

Details

A flaw was found in samba. The Samba smbd file server must map Windows group identities (SIDs) into unix group ids (gids). The code that performs this had a flaw that could allow it to read data beyond the end of the array in the case where a negative cache entry had been added to the mapping cache. This could cause the calling code to return those values into the process token that stores the group membership for a user. The highest threat from this vulnerability is to data confidentiality and integrity.

Severity

6.8 (Medium)


                    
                      CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2021-20254	REPORT
	https://www.samba.org/samba/security/CVE-2021-202…	REPORT
	https://ubuntu.com/security/notices/USN-4930-1	ADVISORY
	https://ubuntu.com/security/notices/USN-4931-1	ADVISORY
	https://www.cve.org/CVERecord?id=CVE-2021-20254	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "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"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "ctdb",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34"
          },
          {
            "binary_name": "libnss-winbind",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34"
          },
          {
            "binary_name": "libpam-winbind",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34"
          },
          {
            "binary_name": "libparse-pidl-perl",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34"
          },
          {
            "binary_name": "libsmbclient",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34"
          },
          {
            "binary_name": "libwbclient0",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34"
          },
          {
            "binary_name": "python-samba",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34"
          },
          {
            "binary_name": "registry-tools",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34"
          },
          {
            "binary_name": "samba",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34"
          },
          {
            "binary_name": "samba-common",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34"
          },
          {
            "binary_name": "samba-common-bin",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34"
          },
          {
            "binary_name": "samba-dsdb-modules",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34"
          },
          {
            "binary_name": "samba-libs",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34"
          },
          {
            "binary_name": "samba-testsuite",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34"
          },
          {
            "binary_name": "samba-vfs-modules",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34"
          },
          {
            "binary_name": "smbclient",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34"
          },
          {
            "binary_name": "winbind",
            "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "samba",
        "purl": "pkg:deb/ubuntu/samba@2:4.3.11+dfsg-0ubuntu0.16.04.34?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:4.3.11+dfsg-0ubuntu0.16.04.34"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:4.1.17+dfsg-4ubuntu2",
        "2:4.1.20+dfsg-1ubuntu1",
        "2:4.1.20+dfsg-1ubuntu2",
        "2:4.1.20+dfsg-1ubuntu3",
        "2:4.1.20+dfsg-1ubuntu5",
        "2:4.3.3+dfsg-1ubuntu1",
        "2:4.3.3+dfsg-1ubuntu2",
        "2:4.3.3+dfsg-1ubuntu3",
        "2:4.3.6+dfsg-1ubuntu1",
        "2:4.3.8+dfsg-0ubuntu1",
        "2:4.3.9+dfsg-0ubuntu0.16.04.1",
        "2:4.3.9+dfsg-0ubuntu0.16.04.2",
        "2:4.3.9+dfsg-0ubuntu0.16.04.3",
        "2:4.3.11+dfsg-0ubuntu0.16.04.1",
        "2:4.3.11+dfsg-0ubuntu0.16.04.3",
        "2:4.3.11+dfsg-0ubuntu0.16.04.5",
        "2:4.3.11+dfsg-0ubuntu0.16.04.6",
        "2:4.3.11+dfsg-0ubuntu0.16.04.7",
        "2:4.3.11+dfsg-0ubuntu0.16.04.8",
        "2:4.3.11+dfsg-0ubuntu0.16.04.9",
        "2:4.3.11+dfsg-0ubuntu0.16.04.10",
        "2:4.3.11+dfsg-0ubuntu0.16.04.11",
        "2:4.3.11+dfsg-0ubuntu0.16.04.12",
        "2:4.3.11+dfsg-0ubuntu0.16.04.13",
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        "2:4.3.11+dfsg-0ubuntu0.16.04.24",
        "2:4.3.11+dfsg-0ubuntu0.16.04.25",
        "2:4.3.11+dfsg-0ubuntu0.16.04.26",
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    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "ctdb",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.23"
          },
          {
            "binary_name": "libnss-winbind",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.23"
          },
          {
            "binary_name": "libpam-winbind",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.23"
          },
          {
            "binary_name": "libparse-pidl-perl",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.23"
          },
          {
            "binary_name": "libsmbclient",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.23"
          },
          {
            "binary_name": "libwbclient0",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.23"
          },
          {
            "binary_name": "python-samba",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.23"
          },
          {
            "binary_name": "registry-tools",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.23"
          },
          {
            "binary_name": "samba",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.23"
          },
          {
            "binary_name": "samba-common",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.23"
          },
          {
            "binary_name": "samba-common-bin",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.23"
          },
          {
            "binary_name": "samba-dsdb-modules",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.23"
          },
          {
            "binary_name": "samba-libs",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.23"
          },
          {
            "binary_name": "samba-testsuite",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.23"
          },
          {
            "binary_name": "samba-vfs-modules",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.23"
          },
          {
            "binary_name": "smbclient",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.23"
          },
          {
            "binary_name": "winbind",
            "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.23"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "samba",
        "purl": "pkg:deb/ubuntu/samba@2:4.7.6+dfsg~ubuntu-0ubuntu2.23?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:4.7.6+dfsg~ubuntu-0ubuntu2.23"
            }
          ],
          "type": "ECOSYSTEM"
        }
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        "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"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "ctdb",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "libnss-winbind",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "libpam-winbind",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "libsmbclient",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "libwbclient0",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "python3-samba",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "registry-tools",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "samba",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "samba-common",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "samba-common-bin",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "samba-dsdb-modules",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "samba-libs",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "samba-testsuite",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "samba-vfs-modules",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "smbclient",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "winbind",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "samba",
        "purl": "pkg:deb/ubuntu/samba@2:4.11.6+dfsg-0ubuntu1.8?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:4.11.6+dfsg-0ubuntu1.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:4.10.7+dfsg-0ubuntu2",
        "2:4.10.7+dfsg-0ubuntu3",
        "2:4.11.1+dfsg-3ubuntu1",
        "2:4.11.1+dfsg-3ubuntu2",
        "2:4.11.1+dfsg-3ubuntu4",
        "2:4.11.5+dfsg-1ubuntu1",
        "2:4.11.5+dfsg-1ubuntu2",
        "2:4.11.6+dfsg-0ubuntu1",
        "2:4.11.6+dfsg-0ubuntu1.1",
        "2:4.11.6+dfsg-0ubuntu1.2",
        "2:4.11.6+dfsg-0ubuntu1.3",
        "2:4.11.6+dfsg-0ubuntu1.4",
        "2:4.11.6+dfsg-0ubuntu1.5",
        "2:4.11.6+dfsg-0ubuntu1.6"
      ]
    }
  ],
  "aliases": [],
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  "id": "UBUNTU-CVE-2021-20254",
  "modified": "2026-04-22T07:39:53Z",
  "published": "2021-04-29T00:00:00Z",
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    },
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      "url": "https://www.cve.org/CVERecord?id=CVE-2021-20254"
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      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-20254"
  ]
}

CVE-2021-20254 (GCVE-0-2021-20254)

Vulnerability from cvelistv5 – Published: 2021-05-05 13:36 – Updated: 2024-08-03 17:37

Summary

Severity

No CVSS data available.

CWE

CWE-125

Assigner

redhat redhat root Scorecard

References

7 references

URL	Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1949442	x_refsource_MISC
https://www.samba.org/samba/security/CVE-2021-202…	x_refsource_MISC
https://security.netapp.com/advisory/ntap-2021043…	x_refsource_MISC
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://security.gentoo.org/glsa/202105-22	vendor-advisoryx_refsource_GENTOO
https://lists.debian.org/debian-lts-announce/2021…	mailing-listx_refsource_MLIST

Impacted products

1 product

Vendor	Product	Version
n/a	samba	Affected: samba 4.14.1, samba 4.13.6, samba 4.12.13

Show details on NVD website

JSON

To clipboard

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USN-4930-1 (UBUNTU-CVE-2021-20254)

Vulnerability from osv_ubuntu – Published: 2021-04-29 16:48 – Updated: 2026-04-22 07:36 – Source website

Summary

samba vulnerability

Details

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.

References

URL

Type

	https://ubuntu.com/security/notices/USN-4930-1	ADVISORY
	https://ubuntu.com/security/CVE-2021-20254	REPORT

JSON

To clipboard

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        "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"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "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:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "ctdb",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "libnss-winbind",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "libpam-winbind",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "libsmbclient",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "libwbclient0",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "python3-samba",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "registry-tools",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "samba",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "samba-common",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "samba-common-bin",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "samba-dsdb-modules",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "samba-libs",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "samba-testsuite",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "samba-vfs-modules",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "smbclient",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          },
          {
            "binary_name": "winbind",
            "binary_version": "2:4.11.6+dfsg-0ubuntu1.8"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "samba",
        "purl": "pkg:deb/ubuntu/samba@2:4.11.6+dfsg-0ubuntu1.8?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:4.11.6+dfsg-0ubuntu1.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:4.10.7+dfsg-0ubuntu2",
        "2:4.10.7+dfsg-0ubuntu3",
        "2:4.11.1+dfsg-3ubuntu1",
        "2:4.11.1+dfsg-3ubuntu2",
        "2:4.11.1+dfsg-3ubuntu4",
        "2:4.11.5+dfsg-1ubuntu1",
        "2:4.11.5+dfsg-1ubuntu2",
        "2:4.11.6+dfsg-0ubuntu1",
        "2:4.11.6+dfsg-0ubuntu1.1",
        "2:4.11.6+dfsg-0ubuntu1.2",
        "2:4.11.6+dfsg-0ubuntu1.3",
        "2:4.11.6+dfsg-0ubuntu1.4",
        "2:4.11.6+dfsg-0ubuntu1.5",
        "2:4.11.6+dfsg-0ubuntu1.6"
      ]
    }
  ],
  "aliases": [],
  "details": "Peter 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",
  "id": "USN-4930-1",
  "modified": "2026-04-22T07:36:59Z",
  "published": "2021-04-29T16:48:57Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4930-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-20254"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "samba vulnerability",
  "upstream": [
    "UBUNTU-CVE-2021-20254"
  ]
}

USN-4931-1 (UBUNTU-CVE-2020-14318)

Vulnerability from osv_ubuntu – Published: 2021-05-03 20:44 – Updated: 2026-06-29 10:52 – Source website

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)

References

URL

Type

	https://ubuntu.com/security/notices/USN-4931-1	ADVISORY
	https://ubuntu.com/security/CVE-2020-14318	REPORT
	https://ubuntu.com/security/CVE-2020-14323	REPORT
	https://ubuntu.com/security/CVE-2020-14383	REPORT
	https://ubuntu.com/security/CVE-2021-20254	REPORT

JSON

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"
  ]
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

UBUNTU-CVE-2021-20254 (CVE-2021-20254)

CVE-2021-20254 (GCVE-0-2021-20254)

USN-4930-1 (UBUNTU-CVE-2021-20254)

USN-4931-1 (UBUNTU-CVE-2020-14318)

Tags

Sightings

Nomenclature

Related by attack behaviour