Debian Security Advisory

DLA-301-1 python-django -- LTS security update

Date Reported:
26 Aug 2015
Affected Packages:
python-django
Vulnerable:
Yes
Security database references:
In Mitre's CVE dictionary: CVE-2015-5963, CVE-2015-5964.
More information:

Denial-of-service possibility in logout() view by filling session store

Previously, a session could be created when anonymously accessing the django.contrib.auth.views.logout view (provided it wasn't decorated with django.contrib.auth.decorators.login_required as done in the admin). This could allow an attacker to easily create many new session records by sending repeated requests, potentially filling up the session store or causing other users' session records to be evicted.

The django.contrib.sessions.middleware.SessionMiddleware has been modified to no longer create empty session records.

This portion of the fix has been assigned CVE-2015-5963.

Additionally, the contrib.sessions.backends.base.SessionBase.flush() and cache_db.SessionStore.flush() methods have been modified to avoid creating a new empty session. Maintainers of third-party session backends should check if the same vulnerability is present in their backend and correct it if so.

This portion of the fix has been assigned CVE-2015-5964.

We recommend that you upgrade your python-django packages.