جزئیات آسیب‌پذیری

An unauthenticated OS command injection vulnerability exists within Xdebug versions 2.5.5 and earlier, a PHP debugging extension developed by Derick Rethans. When remote debugging is enabled, Xdebug listens on port 9000 and accepts debugger protocol commands without authentication. An attacker can send a crafted eval command over this interface to execute arbitrary PHP code, which may invoke system-level functions such as system() or passthru(). This results in full compromise of the host under the privileges of the web server user.

• https://xdebug.org/ product
• https://kirtixs.com/blog/2015/11/13/xpwn-exploiting-xdebug-enabled-servers/ technical-description
• http://web.archive.org/web/20231226215418/https://paper.seebug.org/397/ technical-description
• https://www.exploit-db.com/exploits/44568 exploit
• https://www.fortiguard.com/encyclopedia/ips/46000 third-party-advisory
• https://www.vulncheck.com/advisories/xdebug-remote-debugger-unauth-os-command-execution third-party-advisory