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Advisories

Tornado before 6.4.1 HTTP Request Smuggling via Transfer-Encoding

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severity
critical
date
Affecting

  • tornado >= 0, < 6.4.1

CWE
  • CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CVSS
9.0
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:L/SI:H/SA:N
Credit
kenballus
Description
Tornado before 6.4.1 ignores duplicate Transfer-Encoding: chunked headers, treating requests as having no message body and parsing the chunked body as a subsequent request. Attackers can exploit this inconsistency when Tornado is deployed behind proxies to perform HTTP request smuggling, enabling access control bypass, cache poisoning, or connection desynchronization.

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