Python-Django Security Update for Debian 8 LTS
Posted on: 08/06/2019 04:35 PM

Updated python-django packages has been released for Debian GNU/Linux 8 LTS

Python-Django Security Update for Debian 8 LTS


Package : python-django
Version : 1.7.11-1+deb8u7
CVE IDs : CVE-2019-14232 CVE-2019-14233
Debian Bug : #934026

It was discovered that there were two vulnerabilities in the
Django web development framework:

* CVE-2019-14232: Prevent a possible denial-of-service in
django.utils.text.Truncator.

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: Prevent a possible denial-of-service in strip_tags().

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.

Remember that absolutely NO guarantee is provided about the
results of strip_tags() being HTML safe. So NEVER mark safe the
result of a strip_tags() call without escaping it first, for
example with django.utils.html.escape().

For Debian 8 "Jessie", these has been fixed in python-django version
1.7.11-1+deb8u7.

We recommend that you upgrade your python-django packages. You can
find more information in upstream's announcement:

https://www.djangoproject.com/weblog/2019/aug/01/security-releases/

Thanks to Carlton Gibson et al. for their handling of these issues.



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