Arch Linux Security Advisory ASA-201908-2

Severity: Medium
Date : 2019-08-05
CVE-ID : CVE-2019-14232 CVE-2019-14233 CVE-2019-14234 CVE-2019-14235
Package : python-django
Type : multiple issues
Remote : Yes
Link : https://security.archlinux.org/AVG-1015

Summary

The package python-django before version 2.2.4-1 is vulnerable to
multiple issues including denial of service and sql injection.

Resolution

Upgrade to 2.2.4-1.

pacman -Syu “python-django>=2.2.4-1”

The problems have been fixed upstream in version 2.2.4.

Workaround

None.

Description

• CVE-2019-14232 (denial of service)

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.
The regular expressions used by Truncator have been simplified in
order to avoid potential backtracking issues. As a consequence,
trailing punctuation may now at times be included in the truncated
output.

• CVE-2019-14233 (denial of service)

Due to the behavior of the underlying HTMLParser,
django.utils.html.strip_tags() would be extremely slow to evaluate
certain inputs containing large sequences of nested incomplete HTML
entities. The strip_tags() method is used to implement the
corresponding striptags template filter, which was thus also
vulnerable. strip_tags() now avoids recursive calls to HTMLParser when
progress removing tags, but necessarily incomplete HTML entities, stops
being made

• CVE-2019-14234 (sql injection)

Key and index lookups for JSONField and key lookups for HStoreField
were subject to SQL injection, using a suitably crafted dictionary,
with dictionary expansion, as the **kwargs passed to QuerySet.filter().

• CVE-2019-14235 (denial of service)

If passed certain inputs, django.utils.encoding.uri_to_iri() could lead
to significant memory usage due to excessive recursion when re-percent
encoding invalid UTF-8 octet sequences.

Impact

A remote attacker can cause a denial of service via crafted content, or
alter the database via a SQL injection.

References

https://docs.djangoproject.com/en/dev/releases/1.11.23/
https://github.com/django/django/commit/7f65974f8219729c047fbbf8cd5cc9d80faefe77
https://github.com/django/django/commit/4b78420d250df5e21763633871e486ee76728cc4
https://github.com/django/django/commit/7deeabc7c7526786df6894429ce89a9c4b614086
https://github.com/django/django/commit/76ed1c49f804d409cfc2911a890c78584db3c76e
https://security.archlinux.org/CVE-2019-14232
https://security.archlinux.org/CVE-2019-14233
https://security.archlinux.org/CVE-2019-14234
https://security.archlinux.org/CVE-2019-14235