CSRF in Codeigniter
CVE-2022-35943
Shield is an authentication and authorization framework for CodeIgniter 4. This vulnerability may allow [SameSite Attackers](https://canitakeyoursubdomain.name/) to bypass the [CodeIgniter4 CSRF protection](https://codeigniter4.github.io/userguide/libraries/security.html) mechanism with CodeIgniter Shield. For this attack to succeed, the attacker must have direct (or indirect, e.g., XSS) control over a subdomain site (e.g., `https://a.example.com/`) of the target site (e.g., `http://example.com/`). Upgrade to **CodeIgniter v4.2.3 or later** and **Shield v1.0.0-beta.2 or later**. As a workaround: set `Config\Security::$csrfProtection` to `'session,'`remove old session data right after login (immediately after ID and password match) and regenerate CSRF token right after login (immediately after ID and password match)
Vulnerability class: CSRF (Cross-Site Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:L.
EPSS exploit prediction
EPSS: 0.006 (45.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Codeigniter
- Codeigniter Shield — versions 1.0.0
- Codeigniter4 Shield — versions > 4.3.2, > v1.0.0-beta.2
Weakness classification (CWE)
References
- github.com/codeigniter4/shield/security/advisories/GHSA-5hm8-vh6r-2cjq (Exploit, Third Party Advisory, Mitigation)
- codeigniter4.github.io/userguide/libraries/security.htm (Broken Link)
- developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie/SameSite (Third Party Advisory)
- jub0bs.com/posts/2021-01-29-great-samesite-confusion (Third Party Advisory)
Frequently asked questions
- What is CVE-2022-35943?
- CVE-2022-35943 is a medium-severity vulnerability in Codeigniter, classified under Cross-Site Request Forgery (CSRF). CVSS score: 5.9/10. Published 2022-08-12.
- How severe is CVE-2022-35943?
- Medium severity. CVSS v3 base score is 5.9 out of 10.