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CVE PROGRAM SOURCE RECORD7.1 High

CVE-2019-16786

HTTP Request Smuggling: Invalid Transfer-Encoding in Waitress

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Status
Published
Published
Updated
Assigning organization
GitHub_M

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Pylons Waitress

  • <= 1.3.1 to ≤ 1.3.1affected

References