Vulnerability-Lookup

ubuntu-cve-2025-0620

Vulnerability from osv_ubuntu

Published

2025-06-03 00:00

Modified

2026-01-09 17:26

Summary

Details

A flaw was found in Samba. The smbd service daemon does not pick up group membership changes when re-authenticating an expired SMB session. This issue can expose file shares until clients disconnect and then connect again.

Severity

4.9 (Medium)


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

4.9 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2025-0620	REPORT
	https://www.cve.org/CVERecord?id=CVE-2025-0620	REPORT
	https://www.samba.org/samba/security/CVE-2025-0620.html	REPORT
	https://ubuntu.com/security/notices/USN-7564-1	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "ctdb",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "ldb-tools",
            "binary_version": "2:2.10.0+samba4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libldb-dev",
            "binary_version": "2:2.10.0+samba4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libldb2",
            "binary_version": "2:2.10.0+samba4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libnss-winbind",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libpam-winbind",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libsmbclient-dev",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libsmbclient0",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libtalloc-dev",
            "binary_version": "2:2.4.2+samba4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libtalloc2",
            "binary_version": "2:2.4.2+samba4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libtdb-dev",
            "binary_version": "2:1.4.12+samba4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libtdb1",
            "binary_version": "2:1.4.12+samba4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libtevent-dev",
            "binary_version": "2:0.16.1+samba4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libtevent0t64",
            "binary_version": "2:0.16.1+samba4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libwbclient-dev",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libwbclient0",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "python3-ldb",
            "binary_version": "2:2.10.0+samba4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "python3-samba",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "python3-talloc",
            "binary_version": "2:2.4.2+samba4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "python3-tdb",
            "binary_version": "2:1.4.12+samba4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "registry-tools",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "samba",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "samba-ad-dc",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "samba-ad-provision",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "samba-common",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "samba-common-bin",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "samba-dev",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "samba-dsdb-modules",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "samba-libs",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "samba-testsuite",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "samba-vfs-ceph",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "samba-vfs-glusterfs",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "samba-vfs-modules",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "samba-vfs-modules-extra",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "smbclient",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "tdb-tools",
            "binary_version": "2:1.4.12+samba4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "winbind",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.04",
        "name": "samba",
        "purl": "pkg:deb/ubuntu/samba@2:4.21.4+dfsg-1ubuntu3.1?arch=source\u0026distro=plucky"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:4.21.4+dfsg-1ubuntu3.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:4.20.4+dfsg-1ubuntu1",
        "2:4.20.4+dfsg-1ubuntu2",
        "2:4.20.4+dfsg-1ubuntu3",
        "2:4.20.4+dfsg-1ubuntu5",
        "2:4.21.4+dfsg-1ubuntu2",
        "2:4.21.4+dfsg-1ubuntu3"
      ]
    }
  ],
  "aliases": [],
  "details": "A flaw was found in Samba. The smbd service daemon does not pick up group membership changes when re-authenticating an expired SMB session. This issue can expose file shares until clients disconnect and then connect again.",
  "id": "UBUNTU-CVE-2025-0620",
  "modified": "2026-01-09T17:26:47Z",
  "published": "2025-06-03T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-0620"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-0620"
    },
    {
      "type": "REPORT",
      "url": "https://www.samba.org/samba/security/CVE-2025-0620.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-7564-1"
    }
  ],
  "related": [
    "USN-7564-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2025-0620"
  ],
  "withdrawn": "2026-01-20T05:24:58Z"
}

CVE-2025-0620 (GCVE-0-2025-0620)

Vulnerability from cvelistv5 – Published: 2025-06-06 13:10 – Updated: 2026-06-29 23:24

Title

Samba: smbd doesn't pick up group membership changes when re-authenticating an expired smb session

Summary

Severity

4.9 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-552 - Files or Directories Accessible to External Parties

Assigner

redhat

References

4 references

URL	Tags
https://access.redhat.com/security/cve/CVE-2025-0620	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2370453	issue-trackingx_refsource_REDHAT
https://www.samba.org/samba/security/CVE-2025-0620.html
http://www.openwall.com/lists/oss-security/2025/06/03/8

Impacted products

7 products

Vendor	Product	Version
		Affected: 4.21.0 , < 4.21.6 (semver)
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat OpenShift Container Platform 4	cpe:/a:redhat:openshift:4

Date Public

2024-06-03 00:00

Show details on NVD website

JSON

To clipboard

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        "metrics": [
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                ],
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          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
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    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://www.samba.org/",
          "defaultStatus": "unaffected",
          "packageName": "samba",
          "versions": [
            {
              "lessThan": "4.21.6",
              "status": "affected",
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              "versionType": "semver"
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          "cpes": [
            "cpe:/o:redhat:enterprise_linux:10"
          ],
          "defaultStatus": "affected",
          "packageName": "samba",
          "product": "Red Hat Enterprise Linux 10",
          "vendor": "Red Hat"
        },
        {
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          "cpes": [
            "cpe:/o:redhat:enterprise_linux:6"
          ],
          "defaultStatus": "unaffected",
          "packageName": "samba",
          "product": "Red Hat Enterprise Linux 6",
          "vendor": "Red Hat"
        },
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          "cpes": [
            "cpe:/o:redhat:enterprise_linux:6"
          ],
          "defaultStatus": "unaffected",
          "packageName": "samba4",
          "product": "Red Hat Enterprise Linux 6",
          "vendor": "Red Hat"
        },
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          "cpes": [
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          "defaultStatus": "unaffected",
          "packageName": "samba",
          "product": "Red Hat Enterprise Linux 7",
          "vendor": "Red Hat"
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          "cpes": [
            "cpe:/o:redhat:enterprise_linux:8"
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          "defaultStatus": "unaffected",
          "packageName": "samba",
          "product": "Red Hat Enterprise Linux 8",
          "vendor": "Red Hat"
        },
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          "cpes": [
            "cpe:/o:redhat:enterprise_linux:9"
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          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/a:redhat:openshift:4"
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          "defaultStatus": "unaffected",
          "packageName": "rhcos",
          "product": "Red Hat OpenShift Container Platform 4",
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      "metrics": [
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            "type": "Red Hat severity rating"
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            "confidentialityImpact": "HIGH",
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            "privilegesRequired": "HIGH",
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        },
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          ],
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2370453"
        },
        {
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        }
      ],
      "timeline": [
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        {
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          "time": "2024-06-03T00:00:00.000Z",
          "value": "Made public."
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    "datePublished": "2025-06-06T13:10:07.110Z",
    "dateReserved": "2025-01-21T15:54:28.429Z",
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}

usn-7564-1

Vulnerability from osv_ubuntu

Published

2025-06-10 13:30

Modified

2026-01-09 16:46

Summary

samba vulnerability

Details

It was discovered that Samba incorrectly handled certain group membership changes when using Kerberos authentication. A remote user could possibly use this issue to continue to access resources after being removed by an administrator.

References

URL

Type

	https://ubuntu.com/security/notices/USN-7564-1	ADVISORY
	https://ubuntu.com/security/CVE-2025-0620	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2025-0620",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:25.04"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "ctdb",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "ldb-tools",
            "binary_version": "2:2.10.0+samba4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libldb-dev",
            "binary_version": "2:2.10.0+samba4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libldb2",
            "binary_version": "2:2.10.0+samba4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libnss-winbind",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libpam-winbind",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libsmbclient-dev",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libsmbclient0",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libtalloc-dev",
            "binary_version": "2:2.4.2+samba4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libtalloc2",
            "binary_version": "2:2.4.2+samba4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libtdb-dev",
            "binary_version": "2:1.4.12+samba4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libtdb1",
            "binary_version": "2:1.4.12+samba4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libtevent-dev",
            "binary_version": "2:0.16.1+samba4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libtevent0t64",
            "binary_version": "2:0.16.1+samba4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libwbclient-dev",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "libwbclient0",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "python3-ldb",
            "binary_version": "2:2.10.0+samba4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "python3-samba",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "python3-talloc",
            "binary_version": "2:2.4.2+samba4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "python3-tdb",
            "binary_version": "2:1.4.12+samba4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "registry-tools",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "samba",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "samba-ad-dc",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "samba-ad-provision",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "samba-common",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "samba-common-bin",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "samba-dev",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "samba-dsdb-modules",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "samba-libs",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "samba-testsuite",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "samba-vfs-ceph",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "samba-vfs-glusterfs",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "samba-vfs-modules",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "samba-vfs-modules-extra",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "smbclient",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "tdb-tools",
            "binary_version": "2:1.4.12+samba4.21.4+dfsg-1ubuntu3.1"
          },
          {
            "binary_name": "winbind",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.04",
        "name": "samba",
        "purl": "pkg:deb/ubuntu/samba@2:4.21.4+dfsg-1ubuntu3.1?arch=source\u0026distro=plucky"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:4.21.4+dfsg-1ubuntu3.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:4.20.4+dfsg-1ubuntu1",
        "2:4.20.4+dfsg-1ubuntu2",
        "2:4.20.4+dfsg-1ubuntu3",
        "2:4.20.4+dfsg-1ubuntu5",
        "2:4.21.4+dfsg-1ubuntu2",
        "2:4.21.4+dfsg-1ubuntu3"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that Samba incorrectly handled certain group membership\nchanges when using Kerberos authentication. A remote user could possibly\nuse this issue to continue to access resources after being removed by an\nadministrator.\n",
  "id": "USN-7564-1",
  "modified": "2026-01-09T16:46:51Z",
  "published": "2025-06-10T13:30:31.459453Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-7564-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-0620"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "samba vulnerability",
  "upstream": [
    "UBUNTU-CVE-2025-0620"
  ]
}

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.

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.

Action not permitted

ubuntu-cve-2025-0620

Vulnerability from osv_ubuntu

CVE-2025-0620 (GCVE-0-2025-0620)

usn-7564-1

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature