DescriptionTwisted before 16.3.1 does not attempt to address RFC 3875 section 4.1.18 namespace conflicts and therefore does not protect CGI applications from the presence of untrusted client data in the HTTP_PROXY environment variable, which might allow remote attackers to redirect a CGI application's outbound HTTP traffic to an arbitrary proxy server via a crafted Proxy header in an HTTP request, aka an "httpoxy" issue.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
twisted (PTS)bullseye20.3.0-7+deb11u1fixed
sid, trixie24.3.0-2fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
twistedsourcewheezy(not affected)


[wheezy] - twisted <not-affected> (For wheezy affected file is in src:twisted-web)
[wheezy] - twisted-web <no-dsa> (Minor issue)
No part of Twisted does set HTTP_PROXY based on a Proxy: header, upstream plans
to drop related CGI code in future release

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