Vulnerability identifier: #VU56667

Vulnerability risk: Medium

CVSSv3.1: 6.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-39214

CWE-ID: CWE-444

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
mitmproxy
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: mitmproxy.org

Description

The vulnerability allows a remote attacker to preform HTTP request smuggling attacks.

The vulnerability exists due to improper validation of HTTP requests. A remote attacker can send a specially crafted HTTP request to the proxy server and smuggle arbitrary HTTP headers.

Successful exploitation of vulnerability may allow an attacker to poison HTTP cache and perform phishing attacks.

The vulnerability can be exploited by both, a malicious server and client.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

mitmproxy: 0.1 - 7.0.2

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External links
http://github.com/mitmproxy/mitmproxy/security/advisories/GHSA-22gh-3r9q-xf38

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.