[SECURITY] [DLA 1872-1] python-django security update

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.

Regards,

  ,''`.
 : :'  :     Chris Lamb
 `. `'`      [email protected] / chris-lamb.co.uk
   `-