HaxCMS-PHP Command Injection Vulnerability

Vulnerability Description

HAX CMS PHP allows users to manage their microsite universe with a PHP backend. Prior to version 11.0.3, the `gitImportSite` functionality obtains a URL string from a POST request and insufficiently validates user input. The `set_remote` function later passes this input into `proc_open`, yielding OS command injection. An authenticated attacker can craft a URL string that bypasses the validation checks employed by the `filter_var` and `strpos` functions in order to execute arbitrary OS commands on the backend server. The attacker can exfiltrate command output via an HTTP request. Version 11.0.3 contains a patch for the issue.

References

• https://github.com/haxtheweb/issues/security/advisories/GHSA-g4cf-pp4x-hqgw
• https://github.com/haxtheweb/haxcms-nodejs/commit/5131fea6b6be611db76a618f89bd2e164752e9b3