#20869: Prevent repetitive output to counter BREACH-type attacks
-----------------------------+---------------------------------------------
Reporter: patrys | Owner: shaib
Type: New feature | Status: closed
Component: CSRF | Version: master
Severity: Normal | Resolution: fixed
Keywords: | Triage Stage: Ready for checkin
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-----------------------------+---------------------------------------------
Changes (by Shai Berger <shai@…>):
* status: assigned => closed
* resolution: => fixed
Comment:
In [changeset:"5112e65ef2df1dbb95ff83026b6a962fb2688661" 5112e65e]:
{{{
#!CommitTicketReference repository=""
revision="5112e65ef2df1dbb95ff83026b6a962fb2688661"
Fixed #20869 -- made CSRF tokens change every request by salt-encrypting
them
Note that the cookie is not changed every request, just the token
retrieved
by the `get_token()` method (used also by the `{% csrf_token %}` tag).
While at it, made token validation strict: Where, before, any length was
accepted and non-ASCII chars were ignored, we now treat anything other
than
`[A-Za-z0-9]{64}` as invalid (except for 32-char tokens, which, for
backwards-compatibility, are accepted and replaced by 64-char ones).
Thanks Trac user patrys for reporting, github user adambrenecki
for initial patch, Tim Graham for help, and Curtis Maloney,
Collin Anderson, Florian Apolloner, Markus Holtermann & Jon Dufresne
for reviews.
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/20869#comment:41>
Django <https://code.djangoproject.com/>
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