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19 lines
1.9 KiB
Markdown
19 lines
1.9 KiB
Markdown
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### [CVE-2023-40021](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-40021)
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### Description
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Oppia 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. There are no known workarounds for this vulnerability.
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### POC
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#### Reference
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- https://github.com/oppia/oppia/security/advisories/GHSA-49jp-pjc3-2532
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#### Github
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No PoCs found on GitHub currently.
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