- In Waitress version 1.4.2 a new regular expression was added to validate the
headers that Waitress receives to make sure that it matches RFC7230.
Unfortunately the regular expression was written in a way that with invalid
input it leads to catastrophic backtracking which allows for a Denial of
Service and CPU usage going to a 100%.
This is a follow-up to the fix introduced in 1.4.1 to tighten up the way
Waitress strips whitespace from header values. This makes sure Waitress won't
accidentally treat non-printable characters as whitespace and lead to a
potental HTTP request smuggling/splitting security issue.
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dependabot[bot]
commented
2 years ago
Bumps waitress from 0.8.2 to 1.4.3.
Release notes
Sourced from waitress's releases.
Changelog
Sourced from waitress's changelog.
Commits
cbc89bfPrep v1.4.36e46f9eMerge pull request from GHSA-73m2-3pwg-5fgc51b9bd4Remove accidental backslashf87abb7Add bad header that caused catastrophic backtracking2fe8e54Add header parsing tests with short headersac0ca05Remove catastrophic backtracking in regex8af9adbPrep for 1.4.2634d991Merge pull request #277 from Pylons/invalid-whitespace-cont3a54e29Add CHANGES and bump version to 1.4.20bf98daUpdate RFC7230 regex with errata for header field-contentDependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting
@dependabot rebase.Dependabot commands and options
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