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.
The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.
| Link | Tags |
|---|---|
| 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 |