Update dependency requests to v2.31.0 [SECURITY]

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
requests (source, changelog)	==2.26.0 -> ==2.31.0

GitHub Vulnerability Alerts

CVE-2023-32681

Impact

Since Requests v2.3.0, Requests has been vulnerable to potentially leaking Proxy-Authorization headers to destination servers, specifically during redirects to an HTTPS origin. This is a product of how rebuild_proxies is used to recompute and reattach the Proxy-Authorization header to requests when redirected. Note this behavior has only been observed to affect proxied requests when credentials are supplied in the URL user information component (e.g. https://username:password@proxy:8080).

Current vulnerable behavior(s):

1. HTTP → HTTPS: leak
2. HTTPS → HTTP: no leak
3. HTTPS → HTTPS: leak
4. HTTP → HTTP: no leak

For HTTP connections sent through the proxy, the proxy will identify the header in the request itself and remove it prior to forwarding to the destination server. However when sent over HTTPS, the Proxy-Authorization header must be sent in the CONNECT request as the proxy has no visibility into further tunneled requests. This results in Requests forwarding the header to the destination server unintentionally, allowing a malicious actor to potentially exfiltrate those credentials.

The reason this currently works for HTTPS connections in Requests is the Proxy-Authorization header is also handled by urllib3 with our usage of the ProxyManager in adapters.py with proxy_manager_for. This will compute the required proxy headers in proxy_headers and pass them to the Proxy Manager, avoiding attaching them directly to the Request object. This will be our preferred option going forward for default usage.

Patches

Starting in Requests v2.31.0, Requests will no longer attach this header to redirects with an HTTPS destination. This should have no negative impacts on the default behavior of the library as the proxy credentials are already properly being handled by urllib3's ProxyManager.

For users with custom adapters, this may be potentially breaking if you were already working around this behavior. The previous functionality of rebuild_proxies doesn't make sense in any case, so we would encourage any users impacted to migrate any handling of Proxy-Authorization directly into their custom adapter.

Workarounds

For users who are not able to update Requests immediately, there is one potential workaround.

You may disable redirects by setting allow_redirects to False on all calls through Requests top-level APIs. Note that if you're currently relying on redirect behaviors, you will need to capture the 3xx response codes and ensure a new request is made to the redirect destination.

import requests
r = requests.get('http://github.com/', allow_redirects=False)

Credits

This vulnerability was discovered and disclosed by the following individuals.

Dennis Brinkrolf, Haxolot (https://haxolot.com/)
Tobias Funke, (tobiasfunke93@​gmail.com)

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Release Notes

psf/requests

v2.31.0

Compare Source

Security

• Versions of Requests between v2.3.0 and v2.30.0 are vulnerable to potential
  forwarding of Proxy-Authorization headers to destination servers when
  following HTTPS redirects.

  When proxies are defined with user info (https://user:pass@proxy:8080), Requests
  will construct a Proxy-Authorization header that is attached to the request to
  authenticate with the proxy.

  In cases where Requests receives a redirect response, it previously reattached
  the Proxy-Authorization header incorrectly, resulting in the value being
  sent through the tunneled connection to the destination server. Users who rely on
  defining their proxy credentials in the URL are strongly encouraged to upgrade
  to Requests 2.31.0+ to prevent unintentional leakage and rotate their proxy
  credentials once the change has been fully deployed.

  Users who do not use a proxy or do not supply their proxy credentials through
  the user information portion of their proxy URL are not subject to this
  vulnerability.

  Full details can be read in our Github Security Advisory
  and CVE-2023-32681.

v2.30.0

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Dependencies

• ⚠️ Added support for urllib3 2.0. ⚠️

  This may contain minor breaking changes so we advise careful testing and
  reviewing https://urllib3.readthedocs.io/en/latest/v2-migration-guide.html
  prior to upgrading.

  Users who wish to stay on urllib3 1.x can pin to urllib3<2.

v2.29.0

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Improvements

• Requests now defers chunked requests to the urllib3 implementation to improve
  standardization. (#​6226)
• Requests relaxes header component requirements to support bytes/str subclasses. (#​6356)

v2.28.2

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Dependencies

• Requests now supports charset_normalizer 3.x. (#​6261)

Bugfixes

• Updated MissingSchema exception to suggest https scheme rather than http. (#​6188)

v2.28.1

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Improvements

• Speed optimization in iter_content with transition to yield from. (#​6170)

Dependencies

• Added support for chardet 5.0.0 (#​6179)
• Added support for charset-normalizer 2.1.0 (#​6169)

v2.28.0

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Deprecations

• ⚠️ Requests has officially dropped support for Python 2.7. ⚠️ (#​6091)
• Requests has officially dropped support for Python 3.6 (including pypy3.6). (#​6091)

Improvements

• Wrap JSON parsing issues in Request's JSONDecodeError for payloads without
  an encoding to make json() API consistent. (#​6097)
• Parse header components consistently, raising an InvalidHeader error in
  all invalid cases. (#​6154)
• Added provisional 3.11 support with current beta build. (#​6155)
• Requests got a makeover and we decided to paint it black. (#​6095)

Bugfixes

• Fixed bug where setting CURL_CA_BUNDLE to an empty string would disable
  cert verification. All Requests 2.x versions before 2.28.0 are affected. (#​6074)
• Fixed urllib3 exception leak, wrapping urllib3.exceptions.SSLError with
  requests.exceptions.SSLError for content and iter_content. (#​6057)
• Fixed issue where invalid Windows registry entries caused proxy resolution
  to raise an exception rather than ignoring the entry. (#​6149)
• Fixed issue where entire payload could be included in the error message for
  JSONDecodeError. (#​6036)

v2.27.1

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Bugfixes

• Fixed parsing issue that resulted in the auth component being
  dropped from proxy URLs. (#​6028)

v2.27.0

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Improvements

• Officially added support for Python 3.10. (#​5928)

• Added a requests.exceptions.JSONDecodeError to unify JSON exceptions between
  Python 2 and 3. This gets raised in the response.json() method, and is
  backwards compatible as it inherits from previously thrown exceptions.
  Can be caught from requests.exceptions.RequestException as well. (#​5856)

• Improved error text for misnamed InvalidSchema and MissingSchema
  exceptions. This is a temporary fix until exceptions can be renamed
  (Schema->Scheme). (#​6017)

• Improved proxy parsing for proxy URLs missing a scheme. This will address
  recent changes to urlparse in Python 3.9+. (#​5917)

Bugfixes

• Fixed defect in extract_zipped_paths which could result in an infinite loop
  for some paths. (#​5851)

• Fixed handling for AttributeError when calculating length of files obtained
  by Tarfile.extractfile(). (#​5239)

• Fixed urllib3 exception leak, wrapping urllib3.exceptions.InvalidHeader with
  requests.exceptions.InvalidHeader. (#​5914)

• Fixed bug where two Host headers were sent for chunked requests. (#​5391)

• Fixed regression in Requests 2.26.0 where Proxy-Authorization was
  incorrectly stripped from all requests sent with Session.send. (#​5924)

• Fixed performance regression in 2.26.0 for hosts with a large number of
  proxies available in the environment. (#​5924)

• Fixed idna exception leak, wrapping UnicodeError with
  requests.exceptions.InvalidURL for URLs with a leading dot (.) in the
  domain. (#​5414)

Deprecations

• Requests support for Python 2.7 and 3.6 will be ending in 2022. While we
  don't have exact dates, Requests 2.27.x is likely to be the last release
  series providing support.

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