CVE-2021-39214

Advisory

Mitmproxy version 7.0.3 includes a fix for CVE-2021-39214: 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.

Affected package

Affected versions

Fixed versions

Vulnerability changelog

* [CVE-2021-39214](https://github.com/mitmproxy/mitmproxy/security/advisories/GHSA-22gh-3r9q-xf38): Fix request smuggling vulnerabilities reported by chinchila
* Expose TLS 1.0 as possible minimum version on older pyOpenSSL releases
* Fix compatibility with Python 3.10

You can find the latest release packages at https://mitmproxy.org/downloads/.

Resources

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-39214
• https://github.com/mitmproxy/mitmproxy/security/advisories/GHSA-22gh-3r9q-xf38