cve/2024/CVE-2024-21493.md

### [CVE-2024-21493](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-21493)
![](https://img.shields.io/static/v1?label=Product&message=github.com%2Fgreenpau%2Fcaddy-security&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=0%3C%20*%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Improper%20Validation%20of%20Array%20Index&color=brighgreen)

### Description

All versions of the package github.com/greenpau/caddy-security are vulnerable to Improper Validation of Array Index when parsing a Caddyfile. Multiple parsing functions in the affected library do not validate whether their input values are nil before attempting to access elements, which can lead to a panic (index out of range). Panics during the parsing of a configuration file may introduce ambiguity and vulnerabilities, hindering the correct interpretation and configuration of the web server.

### POC

#### Reference
- https://blog.trailofbits.com/2023/09/18/security-flaws-in-an-sso-plugin-for-caddy/
- https://security.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMGREENPAUCADDYSECURITY-5961078

#### Github
- https://github.com/fkie-cad/nvd-json-data-feeds