SSL ssl beast vulnerability

reallove0810 · Jan 3, 2015

Hello,

I setup sll and enter the following parameters like instruction of Nginx HTTPS / SSL Google SPDY configuration

PHP:

ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA:!CAMELLIA;

And I test website in globalsign.com. It show "Sessions may be vulnerable to BEAST attack"
You can see here:
SSL Check
Do you now how to fix it.

eva2000 · Jan 3, 2015

You may want to read this thread in Domains, DNS, Email & SSL Certificates forums at SSL - SSL Setup | Centmin Mod Community

For beast, the set out cipher preferences I suggested is enough see Security Labs: Is BEAST Still a Threat? | Qualys Community it's the same ones recommended officially by Mozilla foundation

Mitigation status
BEAST is purely a client-side vulnerability. Since it had been released to the public, most major browsers addressed it using a technique called 1/n-1 split. This technique stops the attacker from predicting IVs and effectively addresses the underlying problem.

But one platform held back—Apple's. We know little about their intentions, because there hasn't been any official communication on this topic. My understanding is that the 1/n-1 split was incorporated in the Mountain Lion release, but that it is disabled by default. Also, as far as I am aware, the split is not in use on iOS either.

Without Apple addressing the BEAST attack, there's a substantial chunk of users that are still potentially vulnerable. For this reason, at the beginning of this year, SSL Labs started penalizing all sites that do not incorporate server-side mitigations against the attack.

Unfortunately, the only way to mitigate the BEAST attack is to enforce the use of RC4 suites whenever TLS 1.0 and earlier protocols are used (which is most of the time at this point). I say "unfortunately", because very shortly after we had started requiring server-side mitigations, new research about RC4 came out and we found out that this cipher was much weaker than previously thought. The weaknesses were not of immediate concern, but it was clear that RC4 was on the way out.

The situation became uncomfortable because we couldn't solve both problems, but also because both issues were of roughly the same risk. (Low.) Still, the end result was clear: RC4 affects everyone and cannot be mitigated; BEAST affects only a part of the user base and there isn't a workable exploitation path for it any more (we hoped). In addition, we knew that attacks against RC4 were going to get better; and that the attack surface vulnerable to BEAST likely to get smaller.
Click to expand...

Basically, RC4 security could be weaker and vulnerable and that it affects everyone and can not be mitigated while BEAST only affects a portion of users.

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