#20869: Prevent repetitive output to counter BREACH-type attacks
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Reporter: patrys | Owner: adambrenecki
Type: Uncategorized | Status: assigned
Component: contrib.csrf | Version: 1.5
Severity: Normal | Resolution:
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by deprince@…):
What if instead of modifying the csrf middleware to produce tokens that
are resistant to discovery by Breach, we instead modified the
GzipMiddleware to not compress deterministically?
[[http://github.com/wnyc/breach_buster|breach_buster]] provides an
alternatibve GZipMiddleware implementation. It calls flush a few times
at random points in the beginning of the file. This adds noise to the
size of the output file size, making BREACH impossible to implement.
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Ticket URL: <https://code.djangoproject.com/ticket/20869#comment:18>
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