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MEDIUM 5.4

GHSA-vg46-2rrj-3647

Twisted vulnerable to NameVirtualHost Host header injection

Details

When the host header does not match a configured host, `twisted.web.vhost.NameVirtualHost` will return a `NoResource` resource which renders the Host header unescaped into the 404 response allowing HTML and script injection.

Example configuration: ```python from twisted.web.server import Site from twisted.web.vhost import NameVirtualHost from twisted.internet import reactor

resource = NameVirtualHost() site = Site(resource) reactor.listenTCP(8080, site) reactor.run() ``` Output: ``` ❯ curl -H"Host:<h1>HELLO THERE</h1>" http://localhost:8080/

<html> <head><title>404 - No Such Resource</title></head> <body> <h1>No Such Resource</h1> <p>host b'<h1>hello there</h1>' not in vhost map</p> </body> </html> ```

This vulnerability was introduced in f49041bb67792506d85aeda9cf6157e92f8048f4 and first appeared in the 0.9.4 release.

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Affected packages

PyPI / twisted
Introduced in: 0.9.4 Fixed in: 22.10.0rc1
Fix pip install --upgrade 'twisted>=22.10.0rc1'

References