Vulnerability-Lookup

CVE-2021-22538 (GCVE-0-2021-22538)

Vulnerability from cvelistv5 – Published: 2021-03-31 21:10 – Updated: 2024-08-03 18:44

Title

Privilege escalation in RBAC system

Summary

A privilege escalation vulnerability impacting the Google Exposure Notification Verification Server (versions prior to 0.23.1), allows an attacker who (1) has UserWrite permissions and (2) is using a carefully crafted request or malicious proxy, to create another user with higher privileges than their own. This occurs due to insufficient checks on the allowed set of permissions. The new user creation event would be captured in the Event Log.

Severity

6.3 (Medium)


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

CWE

CWE-20 - Improper Input Validation

Assigner

Google CNA under the Google root

CNA scorecard B 77/100 over 39 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/google/exposure-notifications-…	x_refsource_CONFIRM
https://github.com/google/exposure-notifications-…	x_refsource_CONFIRM
https://github.com/google/exposure-notifications-…	x_refsource_CONFIRM
https://github.com/google/exposure-notifications-…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version	CPE status
Google LLC	Exposure Notifications Verification Server	Affected: stable , ≤ 0.23.0 (custom)	guessed

Credits

Michael Mazzolini (Ethical Hacker at WHO)

Show details on NVD website

JSON

To clipboard

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}

FKIE_CVE-2021-22538

Vulnerability from fkie_nvd - Published: 2021-03-31 21:15 - Updated: 2026-06-17 03:37

Severity

6.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

References

URL	Tags
cve-coordination@google.com	https://github.com/google/exposure-notifications-verification-server/commit/eb8cf40b12dbe79304f1133c06fb73419383cd95	Patch, Third Party Advisory
cve-coordination@google.com	https://github.com/google/exposure-notifications-verification-server/releases/tag/v0.23.1	Release Notes, Third Party Advisory
cve-coordination@google.com	https://github.com/google/exposure-notifications-verification-server/releases/tag/v0.24.0	Release Notes, Third Party Advisory
cve-coordination@google.com	https://github.com/google/exposure-notifications-verification-server/security/advisories/GHSA-5v95-v8c8-3rh6	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/google/exposure-notifications-verification-server/commit/eb8cf40b12dbe79304f1133c06fb73419383cd95	Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/google/exposure-notifications-verification-server/releases/tag/v0.23.1	Release Notes, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/google/exposure-notifications-verification-server/releases/tag/v0.24.0	Release Notes, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/google/exposure-notifications-verification-server/security/advisories/GHSA-5v95-v8c8-3rh6	Third Party Advisory

Impacted products

	Vendor	Product	Version
	google	exposure_notifications_verification_server	*

JSON

To clipboard

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          ],
          "product": "Exposure Notifications Verification Server",
          "vendor": "Google LLC",
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    }
  ],
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  "lastModified": "2026-06-17T03:37:24.067",
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          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-03-31T21:15:16.057",
  "references": [
    {
      "source": "cve-coordination@google.com",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/google/exposure-notifications-verification-server/commit/eb8cf40b12dbe79304f1133c06fb73419383cd95"
    },
    {
      "source": "cve-coordination@google.com",
      "tags": [
        "Release Notes",
        "Third Party Advisory"
      ],
      "url": "https://github.com/google/exposure-notifications-verification-server/releases/tag/v0.23.1"
    },
    {
      "source": "cve-coordination@google.com",
      "tags": [
        "Release Notes",
        "Third Party Advisory"
      ],
      "url": "https://github.com/google/exposure-notifications-verification-server/releases/tag/v0.24.0"
    },
    {
      "source": "cve-coordination@google.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://github.com/google/exposure-notifications-verification-server/security/advisories/GHSA-5v95-v8c8-3rh6"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/google/exposure-notifications-verification-server/commit/eb8cf40b12dbe79304f1133c06fb73419383cd95"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Release Notes",
        "Third Party Advisory"
      ],
      "url": "https://github.com/google/exposure-notifications-verification-server/releases/tag/v0.23.1"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Release Notes",
        "Third Party Advisory"
      ],
      "url": "https://github.com/google/exposure-notifications-verification-server/releases/tag/v0.24.0"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://github.com/google/exposure-notifications-verification-server/security/advisories/GHSA-5v95-v8c8-3rh6"
    }
  ],
  "sourceIdentifier": "cve-coordination@google.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ],
      "source": "cve-coordination@google.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-276"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

GHSA-5V95-V8C8-3RH6

Vulnerability from github – Published: 2021-05-21 14:32 – Updated: 2021-05-20 22:26

Summary

Privilege escalation in rbac

Details

Impact

Using a carefully crafted request or malicious proxy, a user with UserWrite permissions could create another user with higher privileges than their own due to insufficient checks on the allowed set of permissions. The event would be captured in the Event Log.

Patches

The issue has been fixed in 0.24.0 and 0.23.1.

Workarounds

For users who are unable to upgrade, we recommend auditing users who have UserWrite permissions and regularly reviewing the Event Log for malicious activity.

Kudos

Thank you to Michael Mazzolini (Ethical Hacker at WHO) for finding and disclosing this vulnerability.

Severity

8.8 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c 0.23.0"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/google/exposure-notifications-verification-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.23.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-22538"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-276"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-05-20T22:26:21Z",
    "nvd_published_at": "2021-03-31T21:15:00Z",
    "severity": "HIGH"
  },
  "details": "### Impact\nUsing a carefully crafted request or malicious proxy, a user with `UserWrite` permissions could create another user with higher privileges than their own due to insufficient checks on the allowed set of permissions. The event would be captured in the Event Log.\n\n### Patches\nThe issue has been fixed in 0.24.0 and 0.23.1.\n\n### Workarounds\nFor users who are unable to upgrade, we recommend auditing users who have `UserWrite` permissions and regularly reviewing the Event Log for malicious activity.\n\n### Kudos\nThank you to Michael Mazzolini (Ethical Hacker at WHO) for finding and disclosing this vulnerability.",
  "id": "GHSA-5v95-v8c8-3rh6",
  "modified": "2021-05-20T22:26:21Z",
  "published": "2021-05-21T14:32:55Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/google/exposure-notifications-verification-server/security/advisories/GHSA-5v95-v8c8-3rh6"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-22538"
    },
    {
      "type": "WEB",
      "url": "https://github.com/google/exposure-notifications-verification-server/commit/eb8cf40b12dbe79304f1133c06fb73419383cd95"
    },
    {
      "type": "WEB",
      "url": "https://github.com/google/exposure-notifications-verification-server/releases/tag/v0.23.1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/google/exposure-notifications-verification-server/releases/tag/v0.24.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Privilege escalation in rbac"
}

GSD-2021-22538

Vulnerability from gsd - Updated: 2023-12-13 01:23

Details

Aliases

CVE-2021-22538

Aliases

CVE-2021-22538

JSON

To clipboard

{
  "GSD": {
    "alias": "CVE-2021-22538",
    "description": "A privilege escalation vulnerability impacting the Google Exposure Notification Verification Server (versions prior to 0.23.1), allows an attacker who (1) has UserWrite permissions and (2) is using a carefully crafted request or malicious proxy, to create another user with higher privileges than their own. This occurs due to insufficient checks on the allowed set of permissions. The new user creation event would be captured in the Event Log.",
    "id": "GSD-2021-22538"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-22538"
      ],
      "details": "A privilege escalation vulnerability impacting the Google Exposure Notification Verification Server (versions prior to 0.23.1), allows an attacker who (1) has UserWrite permissions and (2) is using a carefully crafted request or malicious proxy, to create another user with higher privileges than their own. This occurs due to insufficient checks on the allowed set of permissions. The new user creation event would be captured in the Event Log.",
      "id": "GSD-2021-22538",
      "modified": "2023-12-13T01:23:24.539735Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "security@google.com",
        "ID": "CVE-2021-22538",
        "STATE": "PUBLIC",
        "TITLE": "Privilege escalation in RBAC system"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "Exposure Notifications Verification Server",
                    "version": {
                      "version_data": [
                        {
                          "platform": "all",
                          "version_affected": "\u003c=",
                          "version_name": "stable",
                          "version_value": "0.23.0"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "Google LLC"
            }
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          }
        ]
      },
      "generator": {
        "engine": "Vulnogram 0.0.9"
      },
      "impact": {
        "cvss": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 6.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L",
          "version": "3.1"
        }
      },
      "problemtype": {
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          {
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              {
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                "value": "CWE-20 Improper Input Validation"
              }
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      },
      "references": {
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          {
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          },
          {
            "name": "https://github.com/google/exposure-notifications-verification-server/commit/eb8cf40b12dbe79304f1133c06fb73419383cd95",
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          },
          {
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            "refsource": "CONFIRM",
            "url": "https://github.com/google/exposure-notifications-verification-server/releases/tag/v0.23.1"
          },
          {
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          }
        ]
      },
      "source": {
        "discovery": "UNKNOWN"
      }
    },
    "gitlab.com": {
      "advisories": [
        {
          "affected_range": "\u003c0.23.0",
          "affected_versions": "All versions before 0.23.0",
          "cvss_v2": "AV:N/AC:L/Au:S/C:P/I:P/A:P",
          "cvss_v3": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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            "CWE-1035",
            "CWE-276",
            "CWE-937"
          ],
          "date": "2021-05-21",
          "description": "A privilege escalation vulnerability impacting the Google Exposure Notification Verification Server (versions prior to 0.23.1), allows an attacker who (1) has UserWrite permissions and (2) is using a carefully crafted request or malicious proxy, to create another user with higher privileges than their own. This occurs due to insufficient checks on the allowed set of permissions. The new user creation event would be captured in the Event Log.",
          "fixed_versions": [
            "0.23.1"
          ],
          "identifier": "CVE-2021-22538",
          "identifiers": [
            "GHSA-5v95-v8c8-3rh6",
            "CVE-2021-22538"
          ],
          "not_impacted": "All versions starting from 0.23.0",
          "package_slug": "go/github.com/google/exposure-notifications-verification-server",
          "pubdate": "2021-05-21",
          "solution": "Upgrade to version 0.23.1 or above.",
          "title": "Incorrect Default Permissions",
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            "https://github.com/google/exposure-notifications-verification-server/security/advisories/GHSA-5v95-v8c8-3rh6",
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          ],
          "uuid": "9caf1026-d81d-465a-a4f4-8748d9a48bda"
        }
      ]
    },
    "nvd.nist.gov": {
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                "vulnerable": true
              }
            ],
            "operator": "OR"
          }
        ]
      },
      "cve": {
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          "ASSIGNER": "security@google.com",
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        },
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            }
          ]
        },
        "problemtype": {
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              "description": [
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                  "value": "CWE-276"
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        },
        "references": {
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              "name": "https://github.com/google/exposure-notifications-verification-server/commit/eb8cf40b12dbe79304f1133c06fb73419383cd95",
              "refsource": "CONFIRM",
              "tags": [
                "Patch",
                "Third Party Advisory"
              ],
              "url": "https://github.com/google/exposure-notifications-verification-server/commit/eb8cf40b12dbe79304f1133c06fb73419383cd95"
            },
            {
              "name": "https://github.com/google/exposure-notifications-verification-server/releases/tag/v0.23.1",
              "refsource": "CONFIRM",
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              "refsource": "CONFIRM",
              "tags": [
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              "tags": [
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      },
      "impact": {
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            "availabilityImpact": "PARTIAL",
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          },
          "exploitabilityScore": 8.0,
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          "obtainAllPrivilege": false,
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          "userInteractionRequired": false
        },
        "baseMetricV3": {
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            "attackComplexity": "LOW",
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        }
      },
      "lastModifiedDate": "2021-04-06T14:11Z",
      "publishedDate": "2021-03-31T21:15Z"
    }
  }
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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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.
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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

CVE-2021-22538 (GCVE-0-2021-22538)

FKIE_CVE-2021-22538

GHSA-5V95-V8C8-3RH6

Impact

Patches

Workarounds

Kudos

GSD-2021-22538

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour