{"id":"CVE-2022-31027","state":"PUBLISHED","title":"Authorization Bypass Through User-Controlled Key when using CILogonOAuthenticator in oauthenticator","description":"OAuthenticator is an OAuth token library for the JupyerHub login handler. CILogonOAuthenticator is provided by the OAuthenticator package, and lets users log in to a JupyterHub via CILogon. This is primarily used to restrict a JupyterHub only to users of a given institute. The allowed_idps configuration trait of CILogonOAuthenticator is documented to be a list of domains that indicate the institutions whose users are authorized to access this JupyterHub. This authorization is validated by ensuring that the *email* field provided to us by CILogon has a *domain* that matches one of the domains listed in `allowed_idps`.If `allowed_idps` contains `berkeley.edu`, you might expect only users with valid current credentials provided by University of California, Berkeley to be able to access the JupyterHub. However, CILogonOAuthenticator does *not* verify which provider is used by the user to login, only the email address provided. So a user can login with a GitHub account that has email set to `<something>@berkeley.edu`, and that will be treated exactly the same as someone logging in using the UC Berkeley official Identity Provider. The patch fixing this issue makes a *breaking change* in how `allowed_idps` is interpreted. It's no longer a list of domains, but configuration representing the `EntityID` of the IdPs that are allowed, picked from the [list maintained by CILogon](https://cilogon.org/idplist/). Users are advised to upgrade.","publishedAt":"2022-06-06T21:15:12.000Z","updatedAt":"2025-04-23T18:18:41.917Z","severity":{"score":4.2,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["jupyterhub oauthenticator"],"affected":[{"vendor":"jupyterhub","product":"oauthenticator","versions":[{"version":"< 15.0.0","status":"affected"}]}],"references":["https://github.com/jupyterhub/oauthenticator/security/advisories/GHSA-r7v4-jwx9-wx43"],"weaknesses":["CWE-639"],"ingestedAt":"2026-10-29T19:50:06.617Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/31xxx/CVE-2022-31027.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2022-31027","state":"PUBLISHED","datePublished":"2022-06-06T21:15:12.000Z","dateUpdated":"2025-04-23T18:18:41.917Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2022-05-18T00:00:00.000Z"},"containers":{"cna":{"title":"Authorization Bypass Through User-Controlled Key when using CILogonOAuthenticator in oauthenticator","descriptions":[{"lang":"en","value":"OAuthenticator is an OAuth token library for the JupyerHub login handler. 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So a user can login with a GitHub account that has email set to `<something>@berkeley.edu`, and that will be treated exactly the same as someone logging in using the UC Berkeley official Identity Provider. The patch fixing this issue makes a *breaking change* in how `allowed_idps` is interpreted. It's no longer a list of domains, but configuration representing the `EntityID` of the IdPs that are allowed, picked from the [list maintained by CILogon](https://cilogon.org/idplist/). Users are advised to upgrade."}],"affected":[{"vendor":"jupyterhub","product":"oauthenticator","versions":[{"version":"< 15.0.0","status":"affected"}]}],"references":[{"url":"https://github.com/jupyterhub/oauthenticator/security/advisories/GHSA-r7v4-jwx9-wx43","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.2,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-639","description":"CWE-639: Authorization Bypass Through User-Controlled Key","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","dateUpdated":"2022-06-06T21:15:12.000Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa"},"source":{"advisory":"GHSA-r7v4-jwx9-wx43","discovery":"UNKNOWN"},"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"security-advisories@github.com","ID":"CVE-2022-31027","STATE":"PUBLIC","TITLE":"Authorization Bypass Through User-Controlled Key when using CILogonOAuthenticator in oauthenticator"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"oauthenticator","version":{"version_data":[{"version_value":"< 15.0.0"}]}}]},"vendor_name":"jupyterhub"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"OAuthenticator is an OAuth token library for the JupyerHub login handler. 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So a user can login with a GitHub account that has email set to `<something>@berkeley.edu`, and that will be treated exactly the same as someone logging in using the UC Berkeley official Identity Provider. The patch fixing this issue makes a *breaking change* in how `allowed_idps` is interpreted. It's no longer a list of domains, but configuration representing the `EntityID` of the IdPs that are allowed, picked from the [list maintained by CILogon](https://cilogon.org/idplist/). Users are advised to upgrade."}]},"impact":{"cvss":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.2,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-639: Authorization Bypass Through User-Controlled Key"}]}]},"references":{"reference_data":[{"name":"https://github.com/jupyterhub/oauthenticator/security/advisories/GHSA-r7v4-jwx9-wx43","refsource":"CONFIRM","url":"https://github.com/jupyterhub/oauthenticator/security/advisories/GHSA-r7v4-jwx9-wx43"}]},"source":{"advisory":"GHSA-r7v4-jwx9-wx43","discovery":"UNKNOWN"}}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://github.com/jupyterhub/oauthenticator/security/advisories/GHSA-r7v4-jwx9-wx43","tags":["x_refsource_CONFIRM","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-03T07:03:40.302Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-04-23T14:05:56.695890Z","id":"CVE-2022-31027","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-04-23T18:18:41.917Z"}}]}}}