[Security] Bump flask from 0.12.2 to 1.0.3

[dependabot-preview]

Bumps flask from 0.12.2 to 1.0.3. 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.

1.0.2

This release includes bug fixes and minor changes since 1.0.1. See the changelog for details.

Install or Upgrade

Install from PyPI with pip:

pip install -U Flask

1.0.1

This release includes bug fixes and minor changes since 1.0. See the changelog for details.

Install or Upgrade

Install from PyPI with pip:

pip install -U Flask

1.0

The Pallets team is pleased to release Flask 1.0. [Read the announcement on our blog.](https://www.palletsprojects.com/blog/flask-1-0-released/

There are over a year's worth of changes in this release. Many features have been improved or changed. Read the changelog to understand how your project's code will be affected.

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.

Install or Upgrade

Install from PyPI with pip:

pip install -U Flask

0.12.4

This is a repackage of 0.12.3 to fix an issue with how the package was built.

Upgrade

... (truncated)

Changelog

Sourced from flask's changelog.

Version 1.0.3

Released 2019-05-17

• send_file encodes filenames as ASCII instead of Latin-1 (ISO-8859-1). This fixes compatibility with Gunicorn, which is stricter about header encodings than PEP 3333. (#2766)
• Allow custom CLIs using FlaskGroup to set the debug flag without it always being overwritten based on environment variables. (#2765)
• flask --version outputs Werkzeug's version and simplifies the Python version. (#2825)
• send_file handles an attachment_filename that is a native Python 2 string (bytes) with UTF-8 coded bytes. (#2933)
• A catch-all error handler registered for HTTPException will not handle RoutingException, which is used internally during routing. This fixes the unexpected behavior that had been introduced in 1.0. (#2986)
• Passing the json argument to app.test_client does not push/pop an extra app context. (#2900)

Version 1.0.2

Released 2018-05-02

• Fix more backwards compatibility issues with merging slashes between a blueprint prefix and route. (#2748)
• Fix error with flask routes command when there are no routes. (#2751)

Version 1.0.1

Released 2018-04-29

• Fix registering partials (with no __name__) as view functions. (#2730)
• Don't treat lists returned from view functions the same as tuples. Only tuples are interpreted as response data. (#2736)
• Extra slashes between a blueprint's url_prefix and a route URL are merged. This fixes some backwards compatibility issues with the change in 1.0. (#2731, #2742)
• Only trap BadRequestKeyError errors in debug mode, not all BadRequest errors. This allows abort(400) to continue working as expected. (#2735)
• The FLASK_SKIP_DOTENV environment variable can be set to 1 to skip automatically loading dotenv files. (#2722)

Version 1.0

Released 2018-04-26

• Python 2.6 and 3.3 are no longer supported. (pallets/meta#24)
• Bump minimum dependency versions to the latest stable versions: Werkzeug >= 0.14, Jinja >= 2.10, itsdangerous >= 0.24, Click >= 5.1. (#2586)
• Skip app.run <Flask.run> when a Flask application is run from the command line. This avoids some behavior that was confusing to debug.
• Change the default for JSONIFY_PRETTYPRINT_REGULAR to False. ~json.jsonify returns a compact format by default, and an indented format in debug mode. (#2193)
• Flask.__init__ <Flask> accepts the host_matching argument and sets it on ~Flask.url_map. (#1559)
• Flask.__init__ <Flask> accepts the static_host argument and passes it as the host argument when defining the static route. (#1559)
• send_file supports Unicode in attachment_filename. (#2223)
• Pass _scheme argument from url_for to ~Flask.handle_url_build_error. (#2017)
• ~Flask.add_url_rule accepts the provide_automatic_options argument to disable adding the OPTIONS method. (#1489)
• ~views.MethodView subclasses inherit method handlers from base classes. (#1936)
• Errors caused while opening the session at the beginning of the request are handled by the app's error handlers. (#2254)
• Blueprints gained ~Blueprint.json_encoder and ~Blueprint.json_decoder attributes to override the app's encoder and decoder. (#1898)
• Flask.make_response raises TypeError instead of ValueError for bad response types. The error messages have been improved to describe why the type is invalid. (#2256)
• Add routes CLI command to output routes registered on the application. (#2259)

... (truncated)

Commits

• 99660cc release version 1.0.3
• 3dc84ec Merge pull request #3206 from pallets/test-client-json
• a4f0f19 don't push app context for test client json
• f2c8540 Merge pull request #3169 from DamianSkrzypczak/3168-improve-warning-about-dev...
• e2f4b53 Fix dev-server warning message readability (#3168)
• ab3f922 Merge pull request #3154 from brunoais/more-explicit-session-transaction
• 6142aa6 More explicit explanation: session testing
• 55801b5 Merge pull request #3166 from mekarpeles/refactor/unused-url_join
• ac78da0 removed unused reference to url_join
• 814a7ea Merge pull request #3204 from pallets/azure
• Additional commits viewable in compare view

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