Vulnerability-Lookup

UBUNTU-CVE-2021-38155 (CVE-2021-38155)

Vulnerability from osv_ubuntu – Published: 2021-08-06 21:15 – Updated: 2026-02-12 04:56 – Source website

Details

OpenStack Keystone 10.x through 16.x before 16.0.2, 17.x before 17.0.1, 18.x before 18.0.1, and 19.x before 19.0.1 allows information disclosure during account locking (related to PCI DSS features). By guessing the name of an account and failing to authenticate multiple times, any unauthenticated actor could both confirm the account exists and obtain that account's corresponding UUID, which might be leveraged for other unrelated attacks. All deployments enabling security_compliance.lockout_failure_attempts are affected.

Severity

7.5 (High)


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

N/A (UNKNOWN)

low

References

URL

Type

	https://ubuntu.com/security/CVE-2021-38155	REPORT
	https://www.cve.org/CVERecord?id=CVE-2021-38155	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "keystone",
            "binary_version": "2:9.3.0-0ubuntu3.2"
          },
          {
            "binary_name": "python-keystone",
            "binary_version": "2:9.3.0-0ubuntu3.2"
          }
        ],
        "priority_reason": "Upstream keystone developers have rated this to be a low severity issue"
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "keystone",
        "purl": "pkg:deb/ubuntu/keystone@2:9.3.0-0ubuntu3.2?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:8.0.0-0ubuntu1",
        "2:9.0.0~b1-0ubuntu1",
        "2:9.0.0~b2-0ubuntu1",
        "2:9.0.0~b3-0ubuntu1",
        "2:9.0.0~rc1-0ubuntu1",
        "2:9.0.0-0ubuntu1",
        "2:9.0.2-0ubuntu1",
        "2:9.0.2-0ubuntu2",
        "2:9.1.0-0ubuntu1",
        "2:9.2.0-0ubuntu1",
        "2:9.3.0-0ubuntu1",
        "2:9.3.0-0ubuntu2",
        "2:9.3.0-0ubuntu3",
        "2:9.3.0-0ubuntu3.1",
        "2:9.3.0-0ubuntu3.2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "keystone",
            "binary_version": "2:13.0.4-0ubuntu1"
          },
          {
            "binary_name": "python-keystone",
            "binary_version": "2:13.0.4-0ubuntu1"
          }
        ],
        "priority_reason": "Upstream keystone developers have rated this to be a low severity issue"
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "keystone",
        "purl": "pkg:deb/ubuntu/keystone@2:13.0.4-0ubuntu1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:12.0.0-0ubuntu1",
        "2:13.0.0~b1-0ubuntu1",
        "2:13.0.0~b2-0ubuntu1",
        "2:13.0.0~b3-0ubuntu1",
        "2:13.0.0~rc1-0ubuntu1",
        "2:13.0.0~rc2-0ubuntu1",
        "2:13.0.0-0ubuntu1",
        "2:13.0.1-0ubuntu1",
        "2:13.0.2-0ubuntu1",
        "2:13.0.2-0ubuntu3",
        "2:13.0.4-0ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "keystone",
            "binary_version": "2:17.0.1-0ubuntu2+esm1"
          },
          {
            "binary_name": "keystone-common",
            "binary_version": "2:17.0.1-0ubuntu2+esm1"
          },
          {
            "binary_name": "python3-keystone",
            "binary_version": "2:17.0.1-0ubuntu2+esm1"
          }
        ],
        "priority_reason": "Upstream keystone developers have rated this to be a low severity issue"
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "keystone",
        "purl": "pkg:deb/ubuntu/keystone@2:17.0.1-0ubuntu2+esm1?arch=source\u0026distro=esm-infra/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:16.0.0-0ubuntu1",
        "2:17.0.0~b1~git2019121613.db81fee63-0ubuntu1",
        "2:17.0.0~b2~git2020020513.99733f172-0ubuntu1",
        "2:17.0.0~b3~git2020032415.9f9040257-0ubuntu1",
        "2:17.0.0~b3~git2020032415.9f9040257-0ubuntu2",
        "2:17.0.0~b3~git2020041013.7bb6314e4-0ubuntu1",
        "2:17.0.0-0ubuntu0.20.04.1",
        "2:17.0.1-0ubuntu1",
        "2:17.0.1-0ubuntu2",
        "2:17.0.1-0ubuntu2+esm1"
      ]
    }
  ],
  "aliases": [],
  "details": "OpenStack Keystone 10.x through 16.x before 16.0.2, 17.x before 17.0.1, 18.x before 18.0.1, and 19.x before 19.0.1 allows information disclosure during account locking (related to PCI DSS features). By guessing the name of an account and failing to authenticate multiple times, any unauthenticated actor could both confirm the account exists and obtain that account\u0027s corresponding UUID, which might be leveraged for other unrelated attacks. All deployments enabling security_compliance.lockout_failure_attempts are affected.",
  "id": "UBUNTU-CVE-2021-38155",
  "modified": "2026-02-12T04:56:49Z",
  "published": "2021-08-06T21:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-38155"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-38155"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-38155"
  ]
}

CVE-2021-38155 (GCVE-0-2021-38155)

Vulnerability from cvelistv5 – Published: 2021-08-06 00:00 – Updated: 2024-08-04 01:37

Summary

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root

References

4 references

URL	Tags
https://launchpad.net/bugs/1688137
https://security.openstack.org/ossa/OSSA-2021-003.html
http://www.openwall.com/lists/oss-security/2021/08/10/5	mailing-list
https://lists.debian.org/debian-lts-announce/2024…	mailing-list

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T01:37:16.259Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://launchpad.net/bugs/1688137"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://security.openstack.org/ossa/OSSA-2021-003.html"
          },
          {
            "name": "[oss-security] 20210810 [OSSA-2021-003] Keystone: Account name and UUID oracles in account locking (CVE-2021-38155)",
            "tags": [
              "mailing-list",
              "x_transferred"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2021/08/10/5"
          },
          {
            "name": "[debian-lts-announce] 20240121 [SECURITY] [DLA 3714-1] keystone security update",
            "tags": [
              "mailing-list",
              "x_transferred"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2024/01/msg00007.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "OpenStack Keystone 10.x through 16.x before 16.0.2, 17.x before 17.0.1, 18.x before 18.0.1, and 19.x before 19.0.1 allows information disclosure during account locking (related to PCI DSS features). By guessing the name of an account and failing to authenticate multiple times, any unauthenticated actor could both confirm the account exists and obtain that account\u0027s corresponding UUID, which might be leveraged for other unrelated attacks. All deployments enabling security_compliance.lockout_failure_attempts are affected."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-01-21T23:06:26.719Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "url": "https://launchpad.net/bugs/1688137"
        },
        {
          "url": "https://security.openstack.org/ossa/OSSA-2021-003.html"
        },
        {
          "name": "[oss-security] 20210810 [OSSA-2021-003] Keystone: Account name and UUID oracles in account locking (CVE-2021-38155)",
          "tags": [
            "mailing-list"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2021/08/10/5"
        },
        {
          "name": "[debian-lts-announce] 20240121 [SECURITY] [DLA 3714-1] keystone security update",
          "tags": [
            "mailing-list"
          ],
          "url": "https://lists.debian.org/debian-lts-announce/2024/01/msg00007.html"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2021-38155",
    "datePublished": "2021-08-06T00:00:00.000Z",
    "dateReserved": "2021-08-06T00:00:00.000Z",
    "dateUpdated": "2024-08-04T01:37:16.259Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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.