This is a bug fix release for 2.6.0 where the "TuDoor" fix erroneously
suppressed legitimate Truncated exceptions. This caused the stub
resolver to timeout instead of failing over to TCP when a legitimate
truncated response was received over UDP.
This release addresses the potential DoS issue discussed in the
"TuDoor" paper (CVE-2023-29483). The dnspython stub resolver is
vulnerable to a potential DoS if a bad-in-some-way response from the
right address and port forged by an attacker arrives before a
legitimate one on the UDP port dnspython is using for that query. In
this situation, dnspython might switch to querying another resolver or
give up entirely, possibly denying service for that resolution. This
release addresses the issue by adopting the recommended mitigation,
which is ignoring the bad packets and continuing to listen for a
legitimate response until the timeout for the query has expired.
Thank you to all the contributors to this release, and, as usual,
thanks to my co-maintainers: Tomáš Křížek, Petr Špaček, and Brian
Wellington.
This release addresses the potential DoS issue discussed in the "TuDoor" paper (CVE-2023-29483). The dnspython stub resolver is vulnerable to a potential DoS if a bad-in-some-way response from the right address and port forged by an attacker arrives before a legitimate one on the UDP port dnspython is using for that query. In this situation, dnspython might switch to querying another resolver or give up entirely, possibly denying service for that resolution. This release addresses the issue by adopting the recommended mitigation, which is ignoring the bad packets and continuing to listen for a legitimate response until the timeout for the query has expired.
Thank you to all the contributors to this release, and, as usual, thanks to my co-maintainers: Tomáš Křížek, Petr Špaček, and Brian Wellington.
The Tudoor fix ate legitimate Truncated exceptions, preventing the resolver from
failing over to TCP and causing the query to timeout #1053.
2.6.0
As mentioned in the "TuDoor" paper and the associated CVE-2023-29483, the dnspython
stub resolver is vulnerable to a potential DoS if a bad-in-some-way response from the
right address and port forged by an attacker arrives before a legitimate one on the
UDP port dnspython is using for that query.
This release addresses the issue by adopting the recommended mitigation, which is
ignoring the bad packets and continuing to listen for a legitimate response until
the timeout for the query has expired.
Added support for the NSID EDNS option.
Dnspython now looks for version metadata for optional packages and will not
use them if they are too old. This prevents possible exceptions when a
feature like DoH is not desired in dnspython, but an old httpx is installed
along with dnspython for some other purpose.
The DoHNameserver class now allows GET to be used instead of the default POST,
and also passes source and source_port correctly to the underlying query
methods.
urllib3 is raising ~$40,000 USD to release HTTP/2 support and ensure long-term sustainable maintenance of the project after a sharp decline in financial support for 2023. If your company or organization uses Python and would benefit from HTTP/2 support in Requests, pip, cloud SDKs, and thousands of other projects please consider contributing financially to ensure HTTP/2 support is developed sustainably and maintained for the long-haul.
Thank you for your support.
Changes
Fixed issue where InsecureRequestWarning was emitted for HTTPS connections when using Emscripten. (#3331)
Fixed HTTPConnectionPool.urlopen to stop automatically casting non-proxy headers to HTTPHeaderDict. This change was premature as it did not apply to proxy headers and HTTPHeaderDict does not handle byte header values correctly yet. (#3343)
Changed ProtocolError to InvalidChunkLength when response terminates before the chunk length is sent. (#2860)
Changed ProtocolError to be more verbose on incomplete reads with excess content. (#3261)
Fixed issue where InsecureRequestWarning was emitted for HTTPS connections when using Emscripten. ([#3331](https://github.com/urllib3/urllib3/issues/3331) <https://github.com/urllib3/urllib3/issues/3331>__)
Fixed HTTPConnectionPool.urlopen to stop automatically casting non-proxy headers to HTTPHeaderDict. This change was premature as it did not apply to proxy headers and HTTPHeaderDict does not handle byte header values correctly yet. ([#3343](https://github.com/urllib3/urllib3/issues/3343) <https://github.com/urllib3/urllib3/issues/3343>__)
Changed InvalidChunkLength to ProtocolError when response terminates before the chunk length is sent. ([#2860](https://github.com/urllib3/urllib3/issues/2860) <https://github.com/urllib3/urllib3/issues/2860>__)
Changed ProtocolError to be more verbose on incomplete reads with excess content. ([#3261](https://github.com/urllib3/urllib3/issues/3261) <https://github.com/urllib3/urllib3/issues/3261>__)
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Bumps the dependencies group in /.config with 4 updates: pipdeptree, dnspython, mkdocs-material and urllib3.
Updates
pipdeptree
from 2.13.2 to 2.15.1Release notes
Sourced from pipdeptree's releases.
Commits
bc804e3
Have --license work with --reverse (#321)e8a7801
Have --license and --reverse options in the "render" argument group (#320)c6de3c3
[pre-commit.ci] pre-commit autoupdate (#319)134ca6e
Implement --license option (#318)312818a
[pre-commit.ci] pre-commit autoupdate (#317)9d8f2b7
[pre-commit.ci] pre-commit autoupdate (#316)1cd3453
[pre-commit.ci] pre-commit autoupdate (#315)75389a0
[pre-commit.ci] pre-commit autoupdate (#314)d317f9b
[pre-commit.ci] pre-commit autoupdate (#313)Updates
dnspython
from 2.5.0 to 2.6.1Release notes
Sourced from dnspython's releases.
Changelog
Sourced from dnspython's changelog.
Commits
0a742b9
update CI0ea5ad0
The Tudoor fix should not eat valid Truncated exceptions #1053 (#1054)f12d398
2.6.1 version prepcecb853
Further improve CVE fix coverage to 100% for sync and async.7952e31
test IgnoreErrorse093299
For the Tudoor fix, we also need the UDP nameserver to ignore_unexpected.3af9f78
2.6.0 versioningca63d95
Require cryptography >=41 instead of 42.902cbf3
Create CODE_OF_CONDUCT.mded9795f
github contributing and pull request templateUpdates
mkdocs-material
from 9.5.9 to 9.5.11Release notes
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Sourced from mkdocs-material's changelog.
... (truncated)
Commits
10a97aa
Updated Insiders changelogbe21a6f
Prepare 9.5.11 releasef26cfaa
Documentation23f1886
Removed manually added instant previews in light of new extension59f4147
Updated Insiders changeloga1f4084
Updated distribution filesb24e494
Updated Finnish translation (#6801)740552a
Documentation (#6803)b3e8f09
Updated Premium sponsorsc8eea6b
Merge branch 'master' of github.com:squidfunk/mkdocs-materialUpdates
urllib3
from 2.2.0 to 2.2.1Release notes
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Changelog
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Commits
54d6edf
Release 2.2.149b2dda
Stop casting request headers to HTTPHeaderDict (#3344)e22f651
Fix docstring of retries parameterfa54179
Distinguish between truncated and excess content in response (#3273)cfe52f9
Fix InsecureRequestWarning for HTTPS Emscripten requests (#3333)25155d7
Ensure no remote connections during testing (#3328)12f9233
Bump cryptography to 42.0.2 and PyOpenSSL to 24.0.0 (#3340)9929d3c
Add nox session to start local Pyodide consoleaa8d3dd
Fix ssl_version tests for upcoming migration to pytest 823f2287
Remove TODO about informational responses (#3319)Dependabot 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
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