CVE-2021-39214

Name	CVE-2021-39214
Description	mitmproxy is an interactive, SSL/TLS-capable intercepting proxy. In mitmproxy 7.0.2 and below, a malicious client or server is able to perform HTTP request smuggling attacks through mitmproxy. This means that a malicious client/server could smuggle a request/response through mitmproxy as part of another request/response's HTTP message body. While a smuggled request is still captured as part of another request's body, it does not appear in the request list and does not go through the usual mitmproxy event hooks, where users may have implemented custom access control checks or input sanitization. Unless one uses mitmproxy to protect an HTTP/1 service, no action is required. The vulnerability has been fixed in mitmproxy 7.0.3 and above.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	994570

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
mitmproxy (PTS)	bullseye	6.0.2-1	vulnerable
	sid, bookworm	8.1.1-2	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
mitmproxy	source	(unstable)	8.1.1-1			994570

Notes

[bullseye] - mitmproxy <no-dsa> (Minor issue)
[buster] - mitmproxy <no-dsa> (Minor issue)
[stretch] - mitmproxy <ignored> (Minor issue, intrusive to backport)
https://github.com/mitmproxy/mitmproxy/security/advisories/GHSA-22gh-3r9q-xf38