This script is Copyright (C) 2013 Tenable Network Security, Inc.
The remote FreeBSD host is missing one or more security-related
The Django Project reports :
- Host header poisoning
Several earlier Django security releases focused on the issue of
poisoning the HTTP Host header, causing Django to generate URLs
pointing to arbitrary, potentially-malicious domains.
In response to further input received and reports of continuing issues
following the previous release, we're taking additional steps to
tighten Host header validation. Rather than attempt to accommodate all
features HTTP supports here, Django's Host header validation attempts
to support a smaller, but far more common, subset :
- Hostnames must consist of characters [A-Za-z0-9] plus hyphen ('-')
or dot ('.').
- IP addresses -- both IPv4 and IPv6 -- are permitted.
- Port, if specified, is numeric.
Any deviation from this will now be rejected, raising the exception
- Redirect poisoning
Also following up on a previous issue: in July of this year, we made
changes to Django's HTTP redirect classes, performing additional
validation of the scheme of the URL to redirect to (since, both within
Django's own supplied applications and many third-party applications,
accepting a user-supplied redirect target is a common pattern).
Since then, two independent audits of the code turned up further
potential problems. So, similar to the Host-header issue, we are
taking steps to provide tighter validation in response to reported
problems (primarily with third-party applications, but to a certain
extent also within Django itself). This comes in two parts :
- A new utility function, django.utils.http.is_safe_url, is added;
this function takes a URL and a hostname, and checks that the URL is
either relative, or if absolute matches the supplied hostname. This
function is intended for use whenever user-supplied redirect targets
are accepted, to ensure that such redirects cannot lead to arbitrary
- All of Django's own built-in views -- primarily in the
authentication system -- which allow user-supplied redirect targets
now use is_safe_url to validate the supplied URL.
See also :
Update the affected packages.
Risk factor :
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