CVE-2019-16785
HTTP Request Smuggling: LF vs CRLF handling in Waitress
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
1Exploited in Wild
-Decision
Descriptions
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.
Waitress versión hasta 1.3.1, implementó una parte "MAY" del RFC7230 que declara: "Aunque el terminador de línea para los campos de línea de inicio y encabezado es la secuencia CRLF, un receptor PUEDE reconocer un LF único como un terminador de línea e ignorar cualquier CR anterior". Desafortunadamente, si un servidor front-end no analiza los campos de encabezado con un LF de igual forma que los que tienen un CRLF, puede conllevar a que el servidor front-end y el back-end analice el mismo mensaje HTTP de dos maneras diferentes. Esto puede conllevar a un posible tráfico no autorizado y una división de peticiones HTTP, por lo que Waitress puede visualizar dos peticiones mientras que el servidor front-end solo visualiza un solo mensaje HTTP. Este problema fue corregido en Waitress versión 1.4.0.
An HTTP-request vulnerability was discovered in Waitress which 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 process header fields with an LF the same way as it processes those with a CRLF, it can lead to the front-end and the back-end server processing the same HTTP message in two different ways. This vulnerability can lead to a potential for HTTP request smuggling and splitting where Waitress may see two requests, while the front-end server only sees a single HTTP message.
Quay 3.4.0 release. Issues addressed include HTTP request smuggling, buffer overflow, information leakage, integer overflow, out of bounds read, and out of bounds write vulnerabilities.
CVSS Scores
SSVC
- Decision:-
Timeline
- 2019-09-24 CVE Reserved
- 2019-12-20 CVE Published
- 2024-08-05 CVE Updated
- 2024-08-05 First Exploit
- 2025-03-30 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
CWE
- CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CAPEC
References (10)
URL | Tag | Source |
---|---|---|
https://lists.debian.org/debian-lts-announce/2022/05/msg00011.html | Mailing List |
|
URL | Date | SRC |
---|---|---|
https://github.com/Pylons/waitress/security/advisories/GHSA-pg36-wpm5-g57p | 2024-08-05 |
URL | Date | SRC |
---|---|---|
https://github.com/Pylons/waitress/commit/8eba394ad75deaf9e5cd15b78a3d16b12e6b0eba | 2023-11-07 | |
https://www.oracle.com/security-alerts/cpuapr2022.html | 2023-11-07 |
Affected Vendors, Products, and Versions
Vendor | Product | Version | Other | Status | ||||||
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Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
Agendaless Search vendor "Agendaless" | Waitress Search vendor "Agendaless" for product "Waitress" | <= 1.3.1 Search vendor "Agendaless" for product "Waitress" and version " <= 1.3.1" | - |
Affected
| ||||||
Oracle Search vendor "Oracle" | Communications Cloud Native Core Network Function Cloud Native Environment Search vendor "Oracle" for product "Communications Cloud Native Core Network Function Cloud Native Environment" | 1.10.0 Search vendor "Oracle" for product "Communications Cloud Native Core Network Function Cloud Native Environment" and version "1.10.0" | - |
Affected
| ||||||
Debian Search vendor "Debian" | Debian Linux Search vendor "Debian" for product "Debian Linux" | 9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0" | - |
Affected
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Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 30 Search vendor "Fedoraproject" for product "Fedora" and version "30" | - |
Affected
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Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 31 Search vendor "Fedoraproject" for product "Fedora" and version "31" | - |
Affected
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Redhat Search vendor "Redhat" | Openstack Search vendor "Redhat" for product "Openstack" | 15 Search vendor "Redhat" for product "Openstack" and version "15" | - |
Affected
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