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CVE-2019-16786— HTTP Request Smuggling: Invalid Transfer-Encoding in Waitress

Quick assessment

Affected
Pylons Waitress
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Waitress是一款用于Python的WSGI（Web服务器网关接口）服务器。 Waitress 1.3.1及之前版本中存在环境问题漏洞，该漏洞源于程序没有正确解析Transfer-Encoding标头。远程攻击者可借助特制请求利用该漏洞造成HTTP请求走私。

CVSS 7.1 · High EPSS 2.38% · P83

Possible ATT&CK Techniques 1 AI

T1071 · Application Layer Protocol
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I. Basic Information for CVE-2019-16786

Vulnerability Information
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Vulnerability Title
HTTP Request Smuggling: Invalid Transfer-Encoding in Waitress
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5
Vulnerability Title
Waitress 环境问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Waitress是一款用于Python的WSGI（Web服务器网关接口）服务器。 Waitress 1.3.1及之前版本中存在环境问题漏洞，该漏洞源于程序没有正确解析Transfer-Encoding标头。远程攻击者可借助特制请求利用该漏洞造成HTTP请求走私。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Pylons Waitress <= 1.3.1 ~ 1.3.1 -

II. Public POCs for CVE-2019-16786

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III. Intelligence Information for CVE-2019-16786

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Patches & Fixes for CVE-2019-16786 (1)

Vendor Advisories for CVE-2019-16786 (3)

Mailing List Discussions for CVE-2019-16786 (2)

Other References for CVE-2019-16786 (1)

IV. Related Vulnerabilities

Same product: Waitress
Same vendor: Pylons
Same weakness: CWE-444

V. Comments for CVE-2019-16786

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