HTTP request smuggling in Waitress

1) Inconsistent interpretation of HTTP requests

EUVDB-ID: #VU79727

Risk: Medium

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-16792

CWE-ID: CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')

Exploit availability: No

Description

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

The vulnerability exists due to improper validation of HTTP requests. A remote attacker can send a specially crafted HTTP request with a double Content-Length header to the server and smuggle arbitrary HTTP headers.

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

Mitigation

Install updates from vendor's website.

Vulnerable software versions

waitress: 1.3.0 - 1.3.1

External links

http://docs.pylonsproject.org/projects/waitress/en/latest/#security-fixes
http://github.com/Pylons/waitress/commit/575994cd42e83fd772a5f7ec98b2c56751bd3f65
http://github.com/Pylons/waitress/security/advisories/GHSA-4ppp-gpcr-7qf6
http://www.oracle.com/security-alerts/cpuapr2022.html
http://lists.debian.org/debian-lts-announce/2022/05/msg00011.html

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.