Vulnerability Description
Waitress through version 1.3.1 implemented a "MAY" part of the RFC7230 which states: "Although the line terminator for the start-line and header fields is the sequence CRLF, a recipient MAY recognize a single LF as a line terminator and ignore any preceding CR." Unfortunately if a front-end server does not parse header fields with an LF the same way as it does those with a CRLF it can lead to the front-end and the back-end server parsing the same HTTP message in two different ways. This can lead to a potential for HTTP request smuggling/splitting whereby Waitress may see two requests while the front-end server only sees a single HTTP message. 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-fixesVendor Advisory
- https://github.com/Pylons/waitress/commit/8eba394ad75deaf9e5cd15b78a3d16b12e6b0ePatchThird Party Advisory
- https://github.com/Pylons/waitress/security/advisories/GHSA-pg36-wpm5-g57pExploitThird 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-fixesVendor Advisory
- https://github.com/Pylons/waitress/commit/8eba394ad75deaf9e5cd15b78a3d16b12e6b0ePatchThird Party Advisory
- https://github.com/Pylons/waitress/security/advisories/GHSA-pg36-wpm5-g57pExploitThird 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-2019-16785?
CVE-2019-16785 is a vulnerability with a CVSS score of 7.1 (HIGH). Waitress through version 1.3.1 implemented a "MAY" part of the RFC7230 which states: "Although the line terminator for the start-line and header fields is the sequence CRLF, a recipient MAY recognize ...
How severe is CVE-2019-16785?
CVE-2019-16785 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-2019-16785?
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.