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CVE-2019-16789

7.1 · HIGH

In Waitress through version 1.4.0, if a proxy server is used in front of waitress, an invalid request may be sent by an attacker that bypasses the front-end and is parsed differently by waitress le…

Published Dec 26, 2019CWE-444EPSS 2.59%

Overview

CVE-2019-16789 is a high-severity vulnerability. It was published on December 26, 2019 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

In Waitress through version 1.4.0, if a proxy server is used in front of waitress, an invalid request may be sent by an attacker that bypasses the front-end and is parsed differently by waitress leading to a potential for HTTP request smuggling. Specially crafted requests containing special whitespace characters in the Transfer-Encoding header would get parsed by Waitress as being a chunked request, but a front-end server would use the Content-Length instead as the Transfer-Encoding header is considered invalid due to containing invalid characters. If a front-end server does HTTP pipelining to a backend Waitress server this could lead to HTTP request splitting which may lead to potential cache poisoning or unexpected information disclosure. This issue is fixed in Waitress 1.4.1 through more strict HTTP field validation.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refaccess.redhat.com/errata/RHSA-2020:0720Refdocs.pylonsproject.org/projects/waitress/en/latest/#security-fixesGitHubgithub.com/Pylons/waitress/commit/11d9e138125ad46e951027184b13242a3c1de017GitHubgithub.com/github/advisory-review/pull/14604Reflists.debian.org/debian-lts-announce/2022/05/msg00011.htmlReflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GVDHR2DNKCNQ7YQXISJ45NT4IQDX3LJ7/Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LYEOTGWJZVKPRXX2HBNVIYWCX73QYPM5/Refwww.oracle.com/security-alerts/cpuapr2022.htmlRefaccess.redhat.com/errata/RHSA-2020:0720Refdocs.pylonsproject.org/projects/waitress/en/latest/#security-fixes

How CyberStrike helps

Frequently asked questions

What is CVE-2019-16789?

CVE-2019-16789 is a high-severity vulnerability. It was published on December 26, 2019 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2019-16789?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2019-16789?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2019-16789?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-16789 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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