CVE-2023-40021 (GCVE-0-2023-40021)
Vulnerability from cvelistv5 – Published: 2023-08-16 20:25 – Updated: 2024-10-03 13:37
VLAI
EPSS
VEX
Title
Timing Attack Reveals CSRF Tokens in oppia
Summary
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.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-03 13:33 UTC
Assigner
GitHub_M
CNA
References
4 references
| URL | Tags |
|---|---|
| https://github.com/oppia/oppia/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/oppia/oppia/pull/18769 | x_refsource_MISC |
| https://github.com/oppia/oppia/commit/b89bf808378… | x_refsource_MISC |
| https://github.com/oppia/oppia/blob/3a05c3558a292… | x_refsource_MISC |
Impacted products
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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