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Server side cross-site scripting In twisted

Description

Twisted vulnerable to NameVirtualHost Host header injection 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:

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>...

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

Mitigation

Update Impact

Minimal update. May introduce new vulnerabilities or breaking changes.

Ecosystem
Package
Affected version
Patched versions

1-10 of 18

10

Aliases

1. CVE-2022-393482. NVD-2022-393483. OSV-2022-393484. OSV-DEBIAN-2022-393485. GHSA-vg46-2rrj-36476. GCVE-2022-393487. lists.debian.org8. lists.debian.org9. security.gentoo.org10. SECURITY-TRACKER-CVE-2022-39348

References

1. https://github.com/twisted/twisted/security/advisories/GHSA-vg46-2rrj-36472. https://github.com/twisted/twisted/commit/f2f5e81c03f14e253e85fe457e646130780db40b3. https://github.com/twisted/twisted/commit/f49041bb67792506d85aeda9cf6157e92f8048f4

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