Debian DLA-1303-1 : python-django security update
Medium Nessus Plugin ID 107242
SynopsisThe remote Debian host is missing a security update.
DescriptionSeveral functions were extremely slow to evaluate certain inputs due to catastrophic backtracking vulnerabilities in several regular expressions.
The django.utils.html.urlize() function was extremely slow to evaluate certain inputs due to catastrophic backtracking vulnerabilities in two regular expressions. The urlize() function is used to implement the urlize and urlizetrunc template filters, which were thus vulnerable.
The problematic regular expressions are replaced with parsing logic that behaves similarly.
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 backtracking problem in the regular expression is fixed.
For Debian 7 'Wheezy', these problems have been fixed in version 1.4.22-1+deb7u4.
We recommend that you upgrade your python-django packages.
NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
SolutionUpgrade the affected python-django, and python-django-doc packages.