CVE-2022-35943

low-risk
Published 2022-08-12

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)

Do I need to act?

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0.15% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.9/10 Medium
NETWORK / HIGH complexity

Affected Products (2)

Shield

Affected Vendors

Codeigniter

References (8)

Broken Link https://codeigniter4.github.io/userguide/libraries/security.htm
Third Party Advisory https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie/SameSite
Exploit https://github.com/codeigniter4/shield/security/advisories/GHSA-5hm8-vh6r-2cjq
Third Party Advisory https://jub0bs.com/posts/2021-01-29-great-samesite-confusion
Broken Link https://codeigniter4.github.io/userguide/libraries/security.htm
Third Party Advisory https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie/SameSite
Exploit https://github.com/codeigniter4/shield/security/advisories/GHSA-5hm8-vh6r-2cjq
Third Party Advisory https://jub0bs.com/posts/2021-01-29-great-samesite-confusion
26
/ 100
low-risk
Severity 18/34 · Moderate
Exploitability 1/34 · Minimal
Exposure 7/34 · Low