#24496: Check CSRF Referer against CSRF_COOKIE_DOMAIN
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Reporter: mattrobenolt | Owner: nobody
Type: New feature | Status: new
Component: CSRF | Version: master
Severity: Normal | Resolution:
Keywords: csrf | Triage Stage: Unreviewed
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by mattrobenolt):
I think the comment in this file explains it best:
{{{
# Suppose user visits http://example.com/
# An active network attacker (man-in-the-middle, MITM) sends a
# POST form that targets https://example.com/detonate-bomb/ and
# submits it via JavaScript.
#
# The attacker will need to provide a CSRF cookie and token, but
# that's no problem for a MITM and the session-independent
# nonce we're using. So the MITM can circumvent the CSRF
# protection. This is true for any HTTP connection, but anyone
# using HTTPS expects better! For this reason, for
# https://example.com/ we need additional protection that treats
# http://example.com/ as completely untrusted. Under HTTPS,
# Barth et al. found that the Referer header is missing for
# same-domain requests in only about 0.2% of cases or less, so
# we can use strict Referer checking.
}}}
https://github.com/django/django/blob/668d53cd125175eb708cc0af143f47b42cd42153/django/middleware/csrf.py#L135-L149
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Ticket URL: <https://code.djangoproject.com/ticket/24496#comment:2>
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