CVE-2022-24761: Waitress HTTP Request Smuggling Vulnerability
HIGHCVE-2022-24761 is a HIGH (CVSS 7.5) http request smuggling vulnerability (CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')) affecting Waitress libraries in the PyPI ecosystem. The issue involves http request smuggling in waitress. Remediation is available by upgrading affected packages to version 2.1.1.
CVE-2022-24761 at a Glance
Security Impact
CVSS: 7.5
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N).
How to Fix CVE-2022-24761
To remediate this vulnerability, upgrade all affected Waitress dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
pip install waitress>=2.1.1Run the following command in your project directory to verify that all resolved dependencies use the patched release:
pip show waitressHow to Check if You Are Affected
To determine whether your Python environment is affected by CVE-2022-24761, inspect your installed packages using pip:
pip show waitressAnalyze the terminal output to locate any version of Waitress in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.1.1), your application is affected.
Note: The pip show waitress command checks currently installed packages in your active Python environment.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling'), where 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. In Waitress, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2022-24761 Affected Waitress Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
waitress
|
PyPI |
< 2.1.1
|
2.1.1
|
References
Frequently Asked Questions
What is CVE-2022-24761?
Which Waitress versions are affected?
What version fixes CVE-2022-24761?
Is waitress affected?
What is the CVSS score of CVE-2022-24761?
What CWE is associated with CVE-2022-24761?
How can I check PyPI dependencies for CVE-2022-24761?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-4f7p-27jc-3c36",
"modified" : "2024-11-19T16:04:18Z",
"published" : "2022-03-18T19:00:59Z",
"aliases" : [ "CVE-2022-24761" ],
"summary" : "HTTP Request Smuggling in waitress",
"details" : "### Impact\n\nWhen using Waitress behind a proxy that does not properly validate the incoming HTTP request matches the RFC7230 standard, Waitress and the frontend proxy may disagree on where one request starts and where it ends.\n\nThis would allow requests to be smuggled via the front-end proxy to waitress and later behavior.\n\nThere are two classes of vulnerability that may lead to request smuggling that are addressed by this advisory:\n\n- The use of Python's `int()` to parse strings into integers, leading to `+10` to be parsed as `10`, or `0x01` to be parsed as `1`, where as the standard specifies that the string should contain only digits or hex digits.\n- Waitress does not support chunk extensions, however it was discarding them without validating that they did not contain illegal characters\n\n### Patches\n\nThis has been fixed in Waitress 2.1.1\n\n### Workarounds\n\nWhen deploying a proxy in front of waitress, turning on any and all functionality to make sure that the request matches the RFC7230 standard. Certain proxy servers may not have this functionality though and users are encouraged to upgrade to the latest version of waitress instead.\n\n### References\n\n- https://portswigger.net/research/http-desync-attacks-request-smuggling-reborn\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n* Open an issue in [the Github issue tracker](https://github.com/Pylons/waitress/issues) (if not security related/sensitive)\n* Email us at [pylons-project-security@googlegroups.com](mailto:pylons-project-security@googlegroups.com) (If security related or sensitive)\n",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
}, {
"type" : "CVSS_V4",
"score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "PyPI",
"name" : "waitress"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "2.1.1"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/Pylons/waitress/security/advisories/GHSA-4f7p-27jc-3c36"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-24761"
}, {
"type" : "WEB",
"url" : "https://github.com/Pylons/waitress/commit/9e0b8c801e4d505c2ffc91b891af4ba48af715e0"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/Pylons/waitress"
}, {
"type" : "WEB",
"url" : "https://github.com/Pylons/waitress/releases/tag/v2.1.1"
}, {
"type" : "WEB",
"url" : "https://github.com/pypa/advisory-database/tree/main/vulns/waitress/PYSEC-2022-169.yaml"
}, {
"type" : "WEB",
"url" : "https://lists.debian.org/debian-lts-announce/2022/05/msg00011.html"
}, {
"type" : "WEB",
"url" : "https://www.debian.org/security/2022/dsa-5138"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-444" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2022-03-18T19:00:59Z",
"nvd_published_at" : "2022-03-17T13:15:00Z"
}
}