CVE-2019-16786
Waitress Chunked Transfer Encoding Ignore
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.
INFO
Published Date :
Dec. 20, 2019, 11:15 p.m.
Last Modified :
Nov. 7, 2023, 3:05 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
3.9
Affected Products
The following products are affected by CVE-2019-16786
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2019-16786.
| URL | Resource |
|---|---|
| https://access.redhat.com/errata/RHSA-2020:0720 | Third Party Advisory |
| https://docs.pylonsproject.org/projects/waitress/en/latest/#security-fixes | Release Notes Vendor Advisory |
| https://github.com/Pylons/waitress/commit/f11093a6b3240fc26830b6111e826128af7771c3 | Patch Third Party Advisory |
| https://github.com/Pylons/waitress/security/advisories/GHSA-g2xc-35jw-c63p | Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2022/05/msg00011.html | Mailing 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.html | Patch Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2019-16786 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2019-16786 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Nov. 07, 2023
Action Type Old Value New Value Added Reference GitHub, Inc. https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GVDHR2DNKCNQ7YQXISJ45NT4IQDX3LJ7/ [No types assigned] Added Reference GitHub, Inc. https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LYEOTGWJZVKPRXX2HBNVIYWCX73QYPM5/ [No types assigned] Removed Reference GitHub, Inc. https://lists.fedoraproject.org/archives/list/[email protected]/message/GVDHR2DNKCNQ7YQXISJ45NT4IQDX3LJ7/ Removed Reference GitHub, Inc. https://lists.fedoraproject.org/archives/list/[email protected]/message/LYEOTGWJZVKPRXX2HBNVIYWCX73QYPM5/ -
Modified Analysis by [email protected]
Sep. 23, 2022
Action Type Old Value New Value Changed Reference Type https://access.redhat.com/errata/RHSA-2020:0720 No Types Assigned https://access.redhat.com/errata/RHSA-2020:0720 Third Party Advisory Changed Reference Type https://lists.debian.org/debian-lts-announce/2022/05/msg00011.html No Types Assigned https://lists.debian.org/debian-lts-announce/2022/05/msg00011.html Mailing List, Third Party Advisory Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/GVDHR2DNKCNQ7YQXISJ45NT4IQDX3LJ7/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/GVDHR2DNKCNQ7YQXISJ45NT4IQDX3LJ7/ Mailing List, Third Party Advisory Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/LYEOTGWJZVKPRXX2HBNVIYWCX73QYPM5/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/LYEOTGWJZVKPRXX2HBNVIYWCX73QYPM5/ Mailing List, Third Party Advisory Changed Reference Type https://www.oracle.com/security-alerts/cpuapr2022.html No Types Assigned https://www.oracle.com/security-alerts/cpuapr2022.html Patch, Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:1.10.0:*:*:*:*:*:*:* Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* Added CPE Configuration OR *cpe:2.3:a:redhat:openstack:15:*:*:*:*:*:*:* -
CVE Modified by [email protected]
May. 13, 2022
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2022/05/msg00011.html [No Types Assigned] -
CVE Modified by [email protected]
Apr. 20, 2022
Action Type Old Value New Value Added Reference https://www.oracle.com/security-alerts/cpuapr2022.html [No Types Assigned] -
CVE Modified by [email protected]
Mar. 11, 2020
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2020:0720 [No Types Assigned] -
CVE Modified by [email protected]
Feb. 26, 2020
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/LYEOTGWJZVKPRXX2HBNVIYWCX73QYPM5/ [No Types Assigned] -
CVE Modified by [email protected]
Feb. 25, 2020
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/GVDHR2DNKCNQ7YQXISJ45NT4IQDX3LJ7/ [No Types Assigned] -
Initial Analysis by [email protected]
Dec. 31, 2019
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:P/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Changed Reference Type https://docs.pylonsproject.org/projects/waitress/en/latest/#security-fixes No Types Assigned https://docs.pylonsproject.org/projects/waitress/en/latest/#security-fixes Release Notes, Vendor Advisory Changed Reference Type https://github.com/Pylons/waitress/commit/f11093a6b3240fc26830b6111e826128af7771c3 No Types Assigned https://github.com/Pylons/waitress/commit/f11093a6b3240fc26830b6111e826128af7771c3 Patch, Third Party Advisory Changed Reference Type https://github.com/Pylons/waitress/security/advisories/GHSA-g2xc-35jw-c63p No Types Assigned https://github.com/Pylons/waitress/security/advisories/GHSA-g2xc-35jw-c63p Third Party Advisory Added CWE NIST CWE-444 Added CPE Configuration OR *cpe:2.3:a:agendaless:waitress:*:*:*:*:*:*:*:* versions up to (excluding) 1.3.1 -
CVE Modified by [email protected]
Dec. 21, 2019
Action Type Old Value New Value Changed 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. 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.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2019-16786 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2019-16786
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.28 }} -0.12%
score
0.67704
percentile