[Security] Bump flask from 0.10.1 to 0.12.3 in /requirements

[dependabot-preview]

Bumps flask from 0.10.1 to 0.12.3. This update includes security fixes.

Vulnerabilities fixed

Sourced from The GitHub Security Advisory Database.

Moderate severity vulnerability that affects flask
The Pallets Project flask version Before 0.12.3 contains a CWE-20: Improper Input Validation vulnerability in flask that can result in Large amount of memory usage possibly leading to denial of service. This attack appear to be exploitable via Attacker provides JSON data in incorrect encoding. This vulnerability appears to have been fixed in 0.12.3.

Affected versions: < 0.12.3

Release notes

Sourced from flask's releases.

0.12.3

This release includes an important security fix for JSON and a minor backport for CLI support in PyCharm. It is provided for projects that cannot update to Flask 1.0 immediately. See the 1.0 announcement and update to it instead if possible.

JSON Security Fix

Flask previously decoded incoming JSON bytes using the content type of the request. Although JSON should only be encoded as UTF-8, Flask was more lenient. However, Python includes non-text related encodings that could result in unexpected memory use by a request.

Flask will now detect the encoding of incoming JSON data as one of the supported UTF encodings, and will not allow arbitrary encodings from the request.

Upgrade

Upgrade from PyPI with pip. Use a version identifier if you want to stay at 0.12:

pip install -U 'Flask~=0.12.3'

Or upgrade to 1.0:

pip install -U Flask

Changelog

Sourced from flask's changelog.

Version 0.12.3

Released on April 26th 2018

• Request.get_json no longer accepts arbitrary encodings. Incoming JSON should be encoded using UTF-8 per 8259, but Flask will autodetect UTF-8, -16, or -32. (#2692)
• Fix a Python warning about imports when using python -m flask. (#2666)
• Fix a ValueError caused by invalid Range requests in some cases.

Version 0.12.2

Released on May 16 2017

• Fix a bug in safe_join on Windows.

Version 0.12.1

Bugfix release, released on March 31st 2017

• Prevent flask run from showing a NoAppException when an ImportError occurs within the imported application module.
• Fix encoding behavior of app.config.from_pyfile for Python 3. Fix [#2118](https://github-redirect.dependabot.com/pallets/flask/issues/2118).
• Use the SERVER_NAME config if it is present as default values for app.run. [#2109](https://github-redirect.dependabot.com/pallets/flask/issues/2109), [#2152](https://github-redirect.dependabot.com/pallets/flask/issues/2152)
• Call ctx.auto_pop with the exception object instead of None, in the event that a BaseException such as KeyboardInterrupt is raised in a request handler.

Version 0.12

Released on December 21st 2016, codename Punsch.

• the cli command now responds to --version.
• Mimetype guessing and ETag generation for file-like objects in send_file has been removed, as per issue [#104](https://github-redirect.dependabot.com/pallets/flask/issues/104). (#1849)
• Mimetype guessing in send_file now fails loudly and doesn't fall back to application/octet-stream. (#1988)
• Make flask.safe_join able to join multiple paths like os.path.join (#1730).
• Revert a behavior change that made the dev server crash instead of returning an Internal Server Error (#2006).
• Correctly invoke response handlers for both regular request dispatching as well as error handlers.
• Disable logger propagation by default for the app logger.
• Add support for range requests in send_file.
• app.test_client includes preset default environment, which can now be directly set, instead of per client.get.

Version 0.11.2

Bugfix release, unreleased

• Fix crash when running under PyPy3. (#1814)

Version 0.11.1

... (truncated)

Commits

• 1a9e58e Bump version number to 0.12.3
• 63deee0 release 0.12.3
• 22992a0 add donate link
• 44dc322 add donate link
• 84efe4d enable intersphinx
• 0ff3f72 Merge pull request #2710 from davidism/0.12-docs-theme
• 679bf00 use theme provided by pallets-sphinx-themes
• b354c37 add changelog for 0.12.3
• b178e89 Merge pull request #2695 from pallets/backport-2691-json-encoding
• 0e1e9a0 detect UTF encodings when loading json
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #34.