Vulnerability Description
Waitress through version 1.3.1 would parse the Transfer-Encoding header and only look for a single string value, if that value was not chunked it would fall through and use the Content-Length header instead. According to the HTTP standard Transfer-Encoding should be a comma separated list, with the inner-most encoding first, followed by any further transfer codings, ending with chunked. Requests sent with: "Transfer-Encoding: gzip, chunked" would incorrectly get ignored, and the request would use a Content-Length header instead to determine the body size of the HTTP message. This could allow for Waitress to treat a single request as multiple requests in the case of HTTP pipelining. This issue is fixed in Waitress 1.4.0.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Agendaless | Waitress | < 1.3.1 |
| Oracle | Communications Cloud Native Core Network Function Cloud Native Environment | 1.10.0 |
| Debian | Debian Linux | 9.0 |
| Fedoraproject | Fedora | 30 |
| Redhat | Openstack | 15 |
Related Weaknesses (CWE)
References
- https://access.redhat.com/errata/RHSA-2020:0720Third Party Advisory
- https://docs.pylonsproject.org/projects/waitress/en/latest/#security-fixesRelease NotesVendor Advisory
- https://github.com/Pylons/waitress/commit/f11093a6b3240fc26830b6111e826128af7771PatchThird Party Advisory
- https://github.com/Pylons/waitress/security/advisories/GHSA-g2xc-35jw-c63pThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/05/msg00011.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://www.oracle.com/security-alerts/cpuapr2022.htmlPatchThird Party Advisory
- https://access.redhat.com/errata/RHSA-2020:0720Third Party Advisory
- https://docs.pylonsproject.org/projects/waitress/en/latest/#security-fixesRelease NotesVendor Advisory
- https://github.com/Pylons/waitress/commit/f11093a6b3240fc26830b6111e826128af7771PatchThird Party Advisory
- https://github.com/Pylons/waitress/security/advisories/GHSA-g2xc-35jw-c63pThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/05/msg00011.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
FAQ
What is CVE-2019-16786?
CVE-2019-16786 is a vulnerability with a CVSS score of 7.1 (HIGH). Waitress through version 1.3.1 would parse the Transfer-Encoding header and only look for a single string value, if that value was not chunked it would fall through and use the Content-Length header i...
How severe is CVE-2019-16786?
CVE-2019-16786 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-16786?
Check the references section above for vendor advisories and patch information. Affected products include: Agendaless Waitress, Oracle Communications Cloud Native Core Network Function Cloud Native Environment, Debian Debian Linux, Fedoraproject Fedora, Redhat Openstack.