How to turn off gzip compression for SSL traffic
reallfqq-nginx at yahoo.fr
Mon Aug 19 05:56:18 UTC 2013
On Mon, Aug 19, 2013 at 12:41 AM, Igor Sysoev <igor at sysoev.ru> wrote:
> These are different vulnerabilities: SSL compression is subject to
> CRIME vulnerability while HTTP/SSL compression is subject to BREACH
CRIME attacks a vulnerability in the implementation of SSLv3 and TLS1.0
using CBC flaw: the IV was guessable. Hte other vulnerability was a
facilitator to inject automatically arbitrary content (so attackers could
inject what they wish to make their trail-and-error attack).
CRIME conclusion is: use TLS v1.1 or later (not greater than v1.2 for now).
BREACH attacks the fact that compressed HTTP content encrypted with SSL
makes it easy to guess a known existing header field from the request that
is repeated in the (encrypted) answer looking at the size of the body.
BEAST conclusion is: don't use HTTP compression underneath SSL encryption.
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