FKIE_CVE-2023-40021

Vulnerability from fkie_nvd - Published: 2023-08-16 21:15 - Updated: 2024-11-21 08:18
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
5.3 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
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.
References
security-advisories@github.comhttps://github.com/oppia/oppia/blob/3a05c3558a292f3db9e658e60e708c266c003fd0/core/controllers/base.py#L964-L990Product
security-advisories@github.comhttps://github.com/oppia/oppia/commit/b89bf808378c1236874b5797a7bda32c77b4af23Patch
security-advisories@github.comhttps://github.com/oppia/oppia/pull/18769Patch
security-advisories@github.comhttps://github.com/oppia/oppia/security/advisories/GHSA-49jp-pjc3-2532Exploit, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/oppia/oppia/blob/3a05c3558a292f3db9e658e60e708c266c003fd0/core/controllers/base.py#L964-L990Product
af854a3a-2127-422b-91ae-364da2661108https://github.com/oppia/oppia/commit/b89bf808378c1236874b5797a7bda32c77b4af23Patch
af854a3a-2127-422b-91ae-364da2661108https://github.com/oppia/oppia/pull/18769Patch
af854a3a-2127-422b-91ae-364da2661108https://github.com/oppia/oppia/security/advisories/GHSA-49jp-pjc3-2532Exploit, Vendor Advisory
Impacted products
Vendor Product Version
oppia oppia *
oppia oppia 3.3.2
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:oppia:oppia:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "87F65B5D-6454-4E3C-A7A5-F1FEEC6DC78C",
              "versionEndExcluding": "3.3.2",
              "versionStartIncluding": "1.1.0",
              "vulnerable": true
            },
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      "value": "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\u0027s 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\u0027s 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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  "id": "CVE-2023-40021",
  "lastModified": "2024-11-21T08:18:31.750",
  "metrics": {
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          "confidentialityImpact": "NONE",
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}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.