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AUSCERT External Security Bulletin Redistribution
ESB-2019.3027
python-django security update for Debian LTS
9 August 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: python-django
Publisher: Debian
Operating System: Debian GNU/Linux 8
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-14233 CVE-2019-14232
Reference: ESB-2019.2894
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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
`. `'` lamby@debian.org / chris-lamb.co.uk
`-
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