Vulnerability Details : CVE-2019-16785
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.
Products affected by CVE-2019-16785
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:a:redhat:openstack:15:*:*:*:*:*:*:*
- Oracle » Communications Cloud Native Core Network Function Cloud Native Environment » Version: 1.10.0cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:1.10.0:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
- cpe:2.3:a:agendaless:waitress:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2019-16785
2.09%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 89 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2019-16785
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:P/A:N |
10.0
|
2.9
|
NIST | |
|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
3.9
|
3.6
|
NIST | |
|
7.1
|
HIGH | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N |
1.8
|
4.7
|
GitHub, Inc. |
CWE ids for CVE-2019-16785
-
The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.Assigned by:
- nvd@nist.gov (Primary)
- security-advisories@github.com (Secondary)
References for CVE-2019-16785
-
https://www.oracle.com/security-alerts/cpuapr2022.html
Oracle Critical Patch Update Advisory - April 2022Patch;Third Party Advisory
-
https://docs.pylonsproject.org/projects/waitress/en/latest/#security-fixes
Waitress — waitress 1.4.2 documentationVendor Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GVDHR2DNKCNQ7YQXISJ45NT4IQDX3LJ7/
[SECURITY] Fedora 30 Update: python-waitress-1.4.3-1.fc30 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2022/05/msg00011.html
[SECURITY] [DLA 3000-1] waitress security updateMailing List;Third Party Advisory
-
https://access.redhat.com/errata/RHSA-2020:0720
RHSA-2020:0720 - Security Advisory - Red Hat Customer PortalThird Party Advisory
-
https://github.com/Pylons/waitress/commit/8eba394ad75deaf9e5cd15b78a3d16b12e6b0eba
Remove support for non CRLF line endings · Pylons/waitress@8eba394 · GitHubPatch;Third Party Advisory
-
https://github.com/Pylons/waitress/security/advisories/GHSA-pg36-wpm5-g57p
HTTP Request Smuggling: LF vs CRLF handling in Waitress · Advisory · Pylons/waitress · GitHubExploit;Third Party Advisory
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https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LYEOTGWJZVKPRXX2HBNVIYWCX73QYPM5/
[SECURITY] Fedora 31 Update: python-waitress-1.4.3-1.fc31 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
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