Vulnerability-Lookup

OESA-2021-1207 (CVE-2021-20254)

Vulnerability from osv_openeuler – Published: 2021-06-07 11:04 – Updated: 2026-08-06 11:04 – Source website

Summary

samba security update

Details

Samba is a suite of programs for Linux and Unix to interoperate with Windows.

Security Fix(es):

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.(CVE-2021-20254)

A flaw was found in Samba's libldb. Multiple, consecutive leading spaces in an LDAP attribute can lead to an out-of-bounds memory write, leading to a crash of the LDAP server process handling the request. The highest threat from this vulnerability is to system availability.(CVE-2021-20277)

A flaw was found in samba. Spaces used in a string around a domain name (DN), while supposed to be ignored, can cause invalid DN strings with spaces to instead write a zero-byte into out-of-bounds memory, resulting in a crash. The highest threat from this vulnerability is to system availability.(CVE-2020-27840)

Severity

8.1 (High)


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

References

URL

Type

	https://openeuler.org/en/security/safety-bulletin…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-20254	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-20277	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2020-27840	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "libsmbclient-devel-4.11.12-4.oe1.aarch64.rpm",
          "samba-winbind-4.11.12-4.oe1.aarch64.rpm",
          "python3-samba-dc-4.11.12-4.oe1.aarch64.rpm",
          "python3-samba-test-4.11.12-4.oe1.aarch64.rpm",
          "samba-debuginfo-4.11.12-4.oe1.aarch64.rpm",
          "ctdb-tests-4.11.12-4.oe1.aarch64.rpm",
          "samba-dc-provision-4.11.12-4.oe1.aarch64.rpm",
          "samba-client-4.11.12-4.oe1.aarch64.rpm",
          "libwbclient-4.11.12-4.oe1.aarch64.rpm",
          "samba-help-4.11.12-4.oe1.aarch64.rpm",
          "samba-test-4.11.12-4.oe1.aarch64.rpm",
          "samba-4.11.12-4.oe1.aarch64.rpm",
          "samba-winbind-modules-4.11.12-4.oe1.aarch64.rpm",
          "samba-debugsource-4.11.12-4.oe1.aarch64.rpm",
          "python3-samba-4.11.12-4.oe1.aarch64.rpm",
          "samba-dc-4.11.12-4.oe1.aarch64.rpm",
          "samba-common-4.11.12-4.oe1.aarch64.rpm",
          "ctdb-4.11.12-4.oe1.aarch64.rpm",
          "libwbclient-devel-4.11.12-4.oe1.aarch64.rpm",
          "samba-krb5-printing-4.11.12-4.oe1.aarch64.rpm",
          "samba-common-tools-4.11.12-4.oe1.aarch64.rpm",
          "libsmbclient-4.11.12-4.oe1.aarch64.rpm",
          "samba-winbind-clients-4.11.12-4.oe1.aarch64.rpm",
          "samba-devel-4.11.12-4.oe1.aarch64.rpm",
          "samba-winbind-krb5-locator-4.11.12-4.oe1.aarch64.rpm",
          "samba-dc-bind-dlz-4.11.12-4.oe1.aarch64.rpm",
          "samba-libs-4.11.12-4.oe1.aarch64.rpm"
        ],
        "noarch": [
          "samba-pidl-4.11.12-4.oe1.noarch.rpm"
        ],
        "src": [
          "samba-4.11.12-4.oe1.src.rpm"
        ],
        "x86_64": [
          "ctdb-tests-4.11.12-4.oe1.x86_64.rpm",
          "samba-debuginfo-4.11.12-4.oe1.x86_64.rpm",
          "samba-dc-provision-4.11.12-4.oe1.x86_64.rpm",
          "samba-devel-4.11.12-4.oe1.x86_64.rpm",
          "samba-vfs-glusterfs-4.11.12-4.oe1.x86_64.rpm",
          "samba-krb5-printing-4.11.12-4.oe1.x86_64.rpm",
          "samba-common-tools-4.11.12-4.oe1.x86_64.rpm",
          "samba-dc-4.11.12-4.oe1.x86_64.rpm",
          "samba-4.11.12-4.oe1.x86_64.rpm",
          "libwbclient-devel-4.11.12-4.oe1.x86_64.rpm",
          "samba-debugsource-4.11.12-4.oe1.x86_64.rpm",
          "libsmbclient-devel-4.11.12-4.oe1.x86_64.rpm",
          "samba-common-4.11.12-4.oe1.x86_64.rpm",
          "ctdb-4.11.12-4.oe1.x86_64.rpm",
          "samba-winbind-clients-4.11.12-4.oe1.x86_64.rpm",
          "samba-libs-4.11.12-4.oe1.x86_64.rpm",
          "samba-client-4.11.12-4.oe1.x86_64.rpm",
          "samba-dc-bind-dlz-4.11.12-4.oe1.x86_64.rpm",
          "samba-test-4.11.12-4.oe1.x86_64.rpm",
          "libwbclient-4.11.12-4.oe1.x86_64.rpm",
          "samba-winbind-krb5-locator-4.11.12-4.oe1.x86_64.rpm",
          "samba-winbind-modules-4.11.12-4.oe1.x86_64.rpm",
          "python3-samba-test-4.11.12-4.oe1.x86_64.rpm",
          "samba-help-4.11.12-4.oe1.x86_64.rpm",
          "python3-samba-4.11.12-4.oe1.x86_64.rpm",
          "python3-samba-dc-4.11.12-4.oe1.x86_64.rpm",
          "libsmbclient-4.11.12-4.oe1.x86_64.rpm",
          "samba-winbind-4.11.12-4.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP1",
        "name": "samba",
        "purl": "pkg:rpm/openEuler/samba\u0026distro=openEuler-20.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.11.12-4.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "Samba is a suite of programs for Linux and Unix to interoperate with Windows.\r\n\r\nSecurity Fix(es):\r\n\r\nA 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.(CVE-2021-20254)\r\n\r\nA flaw was found in Samba\u0026apos;s libldb. Multiple, consecutive leading spaces in an LDAP attribute can lead to an out-of-bounds memory write, leading to a crash of the LDAP server process handling the request. The highest threat from this vulnerability is to system availability.(CVE-2021-20277)\r\n\r\nA flaw was found in samba. Spaces used in a string around a domain name (DN), while supposed to be ignored, can cause invalid DN strings with spaces to instead write a zero-byte into out-of-bounds memory, resulting in a crash. The highest threat from this vulnerability is to system availability.(CVE-2020-27840)",
  "id": "OESA-2021-1207",
  "modified": "2026-08-06T11:04:26Z",
  "published": "2021-06-07T11:04:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1207"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-20254"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-20277"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-27840"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "samba security update",
  "upstream": [
    "CVE-2021-20254",
    "CVE-2021-20277",
    "CVE-2020-27840"
  ]
}

CVE-2020-27840 (GCVE-0-2020-27840)

Vulnerability from cvelistv5 – Published: 2021-05-12 14:06 – Updated: 2024-08-04 16:25

Summary

Severity

No CVSS data available.

CWE

CWE-125

Assigner

redhat redhat root

References

9 references

URL	Tags
https://security.netapp.com/advisory/ntap-2021032…	x_refsource_CONFIRM
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.debian.org/debian-lts-announce/2021…	mailing-listx_refsource_MLIST
https://www.debian.org/security/2021/dsa-4884	vendor-advisoryx_refsource_DEBIAN
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://bugzilla.redhat.com/show_bug.cgi?id=1941400	x_refsource_MISC
https://www.samba.org/samba/security/CVE-2020-278…	x_refsource_MISC
https://security.gentoo.org/glsa/202105-22	vendor-advisoryx_refsource_GENTOO

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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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

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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CVE-2021-20277 (GCVE-0-2021-20277)

Vulnerability from cvelistv5 – Published: 2021-05-12 13:54 – Updated: 2024-08-03 17:37

Summary

Severity

No CVSS data available.

CWE

CWE-125

Assigner

redhat redhat root

References

9 references

URL	Tags
https://security.netapp.com/advisory/ntap-2021032…	x_refsource_CONFIRM
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.debian.org/debian-lts-announce/2021…	mailing-listx_refsource_MLIST
https://www.debian.org/security/2021/dsa-4884	vendor-advisoryx_refsource_DEBIAN
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://bugzilla.redhat.com/show_bug.cgi?id=1941402	x_refsource_MISC
https://www.samba.org/samba/security/CVE-2021-202…	x_refsource_MISC
https://security.gentoo.org/glsa/202105-22	vendor-advisoryx_refsource_GENTOO

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

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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.
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

OESA-2021-1207 (CVE-2021-20254)

CVE-2020-27840 (GCVE-0-2020-27840)

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

CVE-2021-20277 (GCVE-0-2021-20277)

Tags

Sightings

Nomenclature

Related by attack behaviour