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                             CERT-Renater

                 Note d'Information No. 2018/VULN090
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DATE                : 07/03/2018

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Django versions prior to 2.0.3,
                                 1.11.11, 1.8.19.

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https://www.djangoproject.com/weblog/2018/mar/06/security-releases/
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Django security releases issued: 2.0.3, 1.11.11, and 1.8.19
Posted by Tim Graham on mars 6, 2018

In accordance with our security release policy, the Django team is
issuing Django 1.8.19, Django 1.11.11 and Django 2.0.3. These release
addresses the security issues detailed below. We encourage all users of
Django to upgrade as soon as possible.

CVE-2018-7536: Denial-of-service possibility in urlize and urlizetrunc
template filters

The django.utils.html.urlize() function was extremely slow to evaluate
certain inputs due to catastrophic backtracking vulnerabilities in two
regular expressions (one regular expression for Django 1.8). The
urlize() function is used to implement the urlize and urlizetrunc
template filters, which were thus vulnerable.

Thanks James Davis for reporting this issue.

CVE-2018-7537: Denial-of-service possibility in truncatechars_html and
truncatewords_html template filters

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.

Thanks James Davis for reporting this issue.


Affected supported versions

    Django master branch
    Django 2.0
    Django 1.11
    Django 1.8

Per our supported versions policy, Django 1.10, 1.9, and Django 1.7 and
older are no longer supported.


Resolution

Patches to resolve the issue have been applied to Django's master
branch and the 2.0, 1.11, and 1.8 release branches. The patches may be
obtained from the following changesets:

On the development master branch:

    urlize
    truncate

On the 2.0 release branch:

    urlize
    truncate

On the 1.11 release branch:

    urlize
    truncate

On the 1.8 release branch:

    urlize
    truncate

The following releases have been issued:

    Django 1.8.19 (download Django 1.8.19 | 1.8.19 checksums)
    Django 1.11.11 (download Django 1.11.11 | 1.11.11 checksums)
    Django 2.0.3 (download Django 2.0.3 | 2.0.3 checksums)

The PGP key ID used for these releases is Tim Graham: 1E8ABDC773EDE252.


General notes regarding security reporting

As always, we ask that potential security issues be reported via
private email to security@djangoproject.com, and not via Django's Trac
instance or the django-developers list. Please see our security
policies for further information.


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+ CERT-RENATER          | tel : 01-53-94-20-44           +
+ 23 - 25 Rue Daviel    | fax : 01-53-94-20-41           +
+ 75013 Paris           | email: cert@support.renater.fr +
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