zend-diactoros (and, by extension, Expressive), zend-http (and, by extension, Zend Framework MVC projects), and zend-feed (specifically, its PubSubHubbub sub-component) each contain a potential URL rewrite exploit. In each case, marshaling a request URI includes logic that introspects HTTP request headers that are specific to a given server-side URL rewrite mechanism.

When these headers are present on systems not running the specific URL rewriting mechanism, the logic would still trigger, allowing a malicious client or proxy to emulate the headers to request arbitrary content.

References

• zendframework/zend-feed@6641f4c
• zendframework/zend-feed@b28589c
• https://framework.zend.com/security/advisory/ZF2018-01
• https://github.com/FriendsOfPHP/security-advisories/blob/master/zendframework/zend-feed/ZF2018-01.yaml