GSD-2019-16786
Vulnerability from gsd - Updated: 2023-12-13 01:23Details
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.
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2019-16786",
"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.",
"id": "GSD-2019-16786",
"references": [
"https://www.suse.com/security/cve/CVE-2019-16786.html",
"https://access.redhat.com/errata/RHSA-2021:0420",
"https://access.redhat.com/errata/RHSA-2020:0720",
"https://advisories.mageia.org/CVE-2019-16786.html"
]
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"aliases": [
"CVE-2019-16786"
],
"details": "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.",
"id": "GSD-2019-16786",
"modified": "2023-12-13T01:23:40.395770Z",
"schema_version": "1.4.0"
}
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"TITLE": "HTTP Request Smuggling: Invalid Transfer-Encoding in Waitress"
},
"affects": {
"vendor": {
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"product": {
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"product_name": "Waitress",
"version": {
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"version_affected": "\u003c=",
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"value": "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."
}
]
},
"impact": {
"cvss": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N",
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"name": "FEDORA-2020-bdcc8ffc24",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GVDHR2DNKCNQ7YQXISJ45NT4IQDX3LJ7/"
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},
{
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"url": "https://access.redhat.com/errata/RHSA-2020:0720"
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"refsource": "MISC",
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{
"name": "https://docs.pylonsproject.org/projects/waitress/en/latest/#security-fixes",
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"url": "https://docs.pylonsproject.org/projects/waitress/en/latest/#security-fixes"
},
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"url": "https://github.com/Pylons/waitress/commit/f11093a6b3240fc26830b6111e826128af7771c3"
},
{
"name": "[debian-lts-announce] 20220512 [SECURITY] [DLA 3000-1] waitress security update",
"refsource": "MLIST",
"url": "https://lists.debian.org/debian-lts-announce/2022/05/msg00011.html"
}
]
},
"source": {
"advisory": "GHSA-g2xc-35jw-c63p",
"discovery": "UNKNOWN"
}
},
"gitlab.com": {
"advisories": [
{
"affected_range": "\u003c1.3.1",
"affected_versions": "All versions before 1.3.1",
"cvss_v2": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
"cvss_v3": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"cwe_ids": [
"CWE-1035",
"CWE-444",
"CWE-937"
],
"date": "2019-12-31",
"description": "Waitress 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.",
"fixed_versions": [
"1.3.1"
],
"identifier": "CVE-2019-16786",
"identifiers": [
"CVE-2019-16786",
"GHSA-g2xc-35jw-c63p"
],
"not_impacted": "All versions starting from 1.3.1",
"package_slug": "pypi/waitress",
"pubdate": "2019-12-20",
"solution": "Upgrade to version 1.3.1 or above.",
"title": "Inconsistent Interpretation of HTTP Requests (HTTP Request Smuggling)",
"urls": [
"https://nvd.nist.gov/vuln/detail/CVE-2019-16786",
"https://docs.pylonsproject.org/projects/waitress/en/latest/#security-fixes"
],
"uuid": "0732fba1-ffee-407f-824f-88ba094fb820"
}
]
},
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},
"impact": {
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"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "NONE",
"baseScore": 5.0,
"confidentialityImpact": "NONE",
"integrityImpact": "PARTIAL",
"vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
"version": "2.0"
},
"exploitabilityScore": 10.0,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"severity": "MEDIUM",
"userInteractionRequired": false
},
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"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6
}
},
"lastModifiedDate": "2022-09-23T18:58Z",
"publishedDate": "2019-12-20T23:15Z"
}
}
}
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Nomenclature
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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