CVE-2019-16786
This could allow for Waitress to treat a single request as multiple requests in the case of HTTP pipelining.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.38%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 2.38% probability · 83th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-444
- Affected
- agendaless/waitress · oracle/communications cloud native core network function cloud native environment · debian/debian linux · fedoraproject/fedora · redhat/openstack
- Source
- security-advisories@github.com
References
- https://access.redhat.com/errata/RHSA-2020:0720Third Party Advisory
- https://docs.pylonsproject.org/projects/waitress/en/latest/#security-fixesRelease Notes, Vendor Advisory
- https://github.com/Pylons/waitress/commit/f11093a6b3240fc26830b6111e826128af7771c3Patch, Third 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 List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GVDHR2DNKCNQ7YQXISJ45NT4IQDX3LJ7/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LYEOTGWJZVKPRXX2HBNVIYWCX73QYPM5/
- https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
- https://access.redhat.com/errata/RHSA-2020:0720Third Party Advisory
- https://docs.pylonsproject.org/projects/waitress/en/latest/#security-fixesRelease Notes, Vendor Advisory
- https://github.com/Pylons/waitress/commit/f11093a6b3240fc26830b6111e826128af7771c3Patch, Third 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 List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GVDHR2DNKCNQ7YQXISJ45NT4IQDX3LJ7/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LYEOTGWJZVKPRXX2HBNVIYWCX73QYPM5/
- https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.