{"metadata": {"vulnerability": "CVE-2023-40021", "count": 14, "kinds": {"milestone": 3, "sighting": 1, "kev": 0, "other": 10}}, "data": [{"timestamp": "2023-08-08T13:46:25.243Z", "date_only": false, "value": "2023-08-08T13:46:25.243Z", "kind": "milestone", "label": "Reserved", "source": "cvelistv5", "record": "CVE-2023-40021", "field": "cveMetadata.dateReserved"}, {"timestamp": "2023-08-16T20:25:22.726Z", "date_only": false, "value": "2023-08-16T20:25:22.726Z", "kind": "milestone", "label": "Published", "source": "cvelistv5", "record": "CVE-2023-40021", "field": "cveMetadata.datePublished", "metric_role": "disclosure", "metric_basis": "recorded_event"}, {"timestamp": "2023-08-16T20:25:22.726Z", "date_only": false, "value": "2023-08-16T20:25:22.726Z", "kind": "other", "label": "Updated", "source": "cvelistv5 / GitHub_M", "record": "CVE-2023-40021", "field": "containers.cna.providerMetadata.dateUpdated"}, {"timestamp": "2023-08-16T21:15:00Z", "date_only": false, "value": "2023-08-16T21:15Z", "kind": "other", "label": "Published Date", "source": "gsd \u00b7 GSD-2023-40021", "record": "GSD-2023-40021", "field": "namespaces.nvd.nist.gov.publishedDate", "linked_record": true}, {"timestamp": "2023-08-16T21:15:09.880Z", "date_only": false, "value": "2023-08-16T21:15:09.880", "kind": "milestone", "label": "Published", "source": "fkie_nvd \u00b7 FKIE_CVE-2023-40021", "record": "FKIE_CVE-2023-40021", "field": "published", "metric_role": "disclosure", "metric_basis": "recorded_event", "linked_record": true}, {"timestamp": "2023-08-17T00:36:51Z", "date_only": false, "value": "2023-08-17T00:36:51.000000Z", "kind": "sighting", "label": "Seen", "source": "https://t.me/cibsecurity/68698", "record": "CVE-2023-40021", "field": "creation_timestamp", "uuid": "7c5771fa-4f36-4e23-8b42-287973e3f7c7", "content": "\u203c CVE-2023-40021 \u203c\n\nOppia is an online learning platform. When comparing a received CSRF token against the expected token, Oppia uses the string equality operator (`==`), which is not safe against timing attacks. By repeatedly submitting invalid tokens, an attacker can brute-force the expected CSRF token character by character. Once they have recovered the token, they can then submit a forged request on behalf of a logged-in user and execute privileged actions on that user's behalf. In particular the function to validate received CSRF tokens is at `oppia.core.controllers.base.CsrfTokenManager.is_csrf_token_valid`. An attacker who can lure a logged-in Oppia user to a malicious website can perform any change on Oppia that the user is authorized to do, including changing profile information; creating, deleting, and changing explorations; etc. Note that the attacker cannot change a user's login credentials. An attack would need to complete within 1 second because every second, the time used in computing the token changes. This issue has been addressed in commit `b89bf80837` which has been included in release `3.3.2-hotfix-2`. Users are advised to upgrade. 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