httputil: Fix quadratic performance of cookie parsing #3446
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Maliciously-crafted cookies can cause Tornado to spend an unreasonable amount of CPU time and block the event loop. This change replaces the quadratic algorithm with a more efficient one. The implementation is copied from the Python 3.13 standard library (the previous one was from Python 3.5). Fixes CVE-2024-52804 See CVE-2024-7592 for a similar vulnerability in cpython. Thanks to github.com/kexinoh for the report.
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`twisted.internet.defer.returnValue` was needed on Python 2, but on Python 3 a simple `return` statement works fine. Twisted 24.7.0 deprecated the former, causing `tornado.test.twisted_test.ConvertDeferredTest.test_success` to fail.
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Is this fix needed for sites where cookie authentication is not used? I.e., are these cookie headers parsed regardless of the authentication method? |
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Cookies are parsed the first time the |
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Maliciously-crafted cookies can cause Tornado to
spend an unreasonable amount of CPU time and block
the event loop.
This change replaces the quadratic algorithm with
a more efficient one. The implementation is copied
from the Python 3.13 standard library (the
previous one was from Python 3.5).
Fixes CVE-2024-52804
See CVE-2024-7592 for a similar vulnerability in cpython.
Thanks to @kexinoh for the report.