Update dependency tornado to v6.3.3 [SECURITY] - autoclosed

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
tornado (source)	==6.2 -> ==6.3.3

GitHub Vulnerability Alerts

CVE-2023-28370

Open redirect vulnerability in Tornado versions 6.3.1 and earlier allows a remote unauthenticated attacker to redirect a user to an arbitrary web site and conduct a phishing attack by having user access a specially crafted URL.

GHSA-qppv-j76h-2rpx

Summary

Tornado interprets -, +, and _ in chunk length and Content-Length values, which are not allowed by the HTTP RFCs. This can result in request smuggling when Tornado is deployed behind certain proxies that interpret those non-standard characters differently. This is known to apply to older versions of haproxy, although the current release is not affected.

Details

Tornado uses the int constructor to parse the values of Content-Length headers and chunk lengths in the following locations:

tornado/http1connection.py:445

            self._expected_content_remaining = int(headers["Content-Length"])

tornado/http1connection.py:621

                content_length = int(headers["Content-Length"])  # type: Optional[int]

tornado/http1connection.py:671

            chunk_len = int(chunk_len_str.strip(), 16)

Because int("0_0") == int("+0") == int("-0") == int("0"), using the int constructor to parse and validate strings that should contain only ASCII digits is not a good strategy.

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Release Notes

tornadoweb/tornado (tornado)

v6.3.3

Compare Source

v6.3.2

Compare Source

v6.3.1

Compare Source

v6.3

Compare Source

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