[Security] Bump django from 1.11.10 to 1.11.21

[dependabot-preview]

Bumps django from 1.11.10 to 1.11.21. This update includes security fixes.

Vulnerabilities fixed

Sourced from The GitHub Security Advisory Database.

Moderate severity vulnerability that affects django
An issue was discovered in Django 2.0 before 2.0.3, 1.11 before 1.11.11, and 1.8 before 1.8.19. The django.utils.html.urlize() function was extremely slow to evaluate certain inputs due to catastrophic backtracking vulnerabilities in two regular expressions (only one regular expression for Django 1.8.x). The urlize() function is used to implement the urlize and urlizetrunc template filters, which were thus vulnerable.

Affected versions: >= 1.11, < 1.11.11

Sourced from The GitHub Security Advisory Database.

Moderate severity vulnerability that affects django
An issue was discovered in Django 2.0 before 2.0.3, 1.11 before 1.11.11, and 1.8 before 1.8.19. If django.utils.text.Truncator's chars() and words() methods were passed the html=True argument, they were extremely slow to evaluate certain inputs due to a catastrophic backtracking vulnerability in a regular expression. The chars() and words() methods are used to implement the truncatechars_html and truncatewords_html template filters, which were thus vulnerable.

Affected versions: >= 1.11, < 1.11.11

Sourced from The GitHub Security Advisory Database.

Moderate severity vulnerability that affects django
django.middleware.common.CommonMiddleware in Django 1.11.x before 1.11.15 and 2.0.x before 2.0.8 has an Open Redirect.

Affected versions: >= 1.11.0, < 1.11.15

Sourced from The GitHub Security Advisory Database.

Moderate severity vulnerability that affects django
An issue was discovered in Django 1.11 before 1.11.21, 2.1 before 2.1.9, and 2.2 before 2.2.2. The clickable Current URL value displayed by the AdminURLFieldWidget displays the provided value without validating it as a safe URL. Thus, an unvalidated value stored in the database, or a value provided as a URL query parameter payload, could result in an clickable JavaScript link.

Affected versions: >= 1.11.0, < 1.11.21

Sourced from The GitHub Security Advisory Database.

Low severity vulnerability that affects django
In Django 1.11.x before 1.11.18, 2.0.x before 2.0.10, and 2.1.x before 2.1.5, an Improper Neutralization of Special Elements in Output Used by a Downstream Component issue exists in django.views.defaults.page_not_found(), leading to content spoofing (in a 404 error page) if a user fails to recognize that a crafted URL has malicious content.

Affected versions: < 1.11.18

Sourced from The GitHub Security Advisory Database.

Memory exhaustion in django.utils.numberformat.format()
If django.utils.numberformat.format() -- used by contrib.admin as well as the the floatformat, filesizeformat, and intcomma templates filters -- received a Decimal with a large number of digits or a large exponent, it could lead to significant memory usage due to a call to '{:f}'.format().

Affected versions: >= 1.11.0, < 1.11.19; >= 2.0.0, < 2.0.11; >= 2.1.0, < 2.1.6

Sourced from The GitHub Security Advisory Database.

Moderate severity vulnerability that affects django
Django 1.11.x before 1.11.19, 2.0.x before 2.0.11, and 2.1.x before 2.1.6 allows Uncontrolled Memory Consumption via a malicious attacker-supplied value to the django.utils.numberformat.format() function.

Affected versions: < 1.11.19

Commits

• bc1f79d [1.11.x] Bumped version for 1.11.21 release.
• c238701 [1.11.x] Fixed CVE-2019-12308 -- Made AdminURLFieldWidget validate URL before...
• 4b3716e [1.11.x] Added stub release notes for security releases.
• 331d765 [1.11.x] Refs #27807 -- Removed docs for User.username_validator.
• d13490c [1.11.x] Refs #30331 -- Doc'd that psycopg2 < 2.8 is required.
• 22c0564 [1.11.x] Fixed #30277 -- Fixed broken links to packaging.python.org.
• 9530fac [1.11.x] Fixed serializers test crash if PyYAML isn't installed.
• f8ce3cd [1.11.x] Fixed serializers tests for PyYAML 5.1+.
• f13bfde [1.11.x] Reverted "Fixed relative paths imports per isort 4.3.5."
• b9beb6a [1.11.x] Fixed relative paths imports per isort 4.3.5.
• Additional commits viewable in compare view

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[coveralls]

Coverage remained the same at 93.782% when pulling 3242af6 on dependabot/pip/django-1.11.21 into 222ec63 on master.

[dependabot-preview]

Superseded by #537.