Vulnerability · Published Aug 12, 2022 · Assigned by GitHub_M

CVE-2022-35943SameSite may allow cross-site request forgery (CSRF) protection to be bypassed

Medium 5.9

In plain English

A medium-severity cross-site request forgery in shield from codeigniter4. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.9Medium

Exploit odds (30 days)0.6%top 50.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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)

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	codeigniter4/shield	1.0.0-beta.2	GHSA-5hm8-vh6r-2cjq

Affected products (as reported)

Vendor	Product	Versions
codeigniter4	shield	> 4.3.2, > v1.0.0-beta.2

Weakness: CWE-352 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:L

References

https://github.com/codeigniter4/shield/security/advisories/GHSA-5hm8-vh6r-2cjq x_refsource_CONFIRM
https://codeigniter4.github.io/userguide/libraries/security.htm x_refsource_MISC
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie/SameSite x_refsource_MISC
https://jub0bs.com/posts/2021-01-29-great-samesite-confusion x_refsource_MISC