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.
In each of the affected components, we have removed support for the specific request headers. Users can provide support within their applications to re-instate the logic if they are using the specific URL rewrite mechanism; users are encouraged to filter these headers in their web server prior to any rewrites to ensure their validity.
The patch resolving the vulnerability is available in:
Zend Framework MVC, Apigility, and Expressive users will receive relevant
updated components via
We highly recommend all users of affected projects update immediately.
The Zend Framework team thanks the following for identifying the issues and working with us to help protect its users:
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