Re: [gentoo-user] apache-2.2.27 disable SSLCipherSuite LOW 40 56 bit

[Mick <michaelkintzios@gmail.com>]

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On Sunday 22 Jun 2014 02:29:44 Joseph wrote:
> Before upgrading to apache 2.2.27 I had this line in httpd.conf
> SSLProtocol -ALL +SSLv3 +TLSv1 +TLSv1.2
> SSLCipherSuite ALL:!ADH:RC4+RSA:+HIGH:+MEDIUM:!LOW:!SSLv2:!EXPORT
> 
> and I was getting "A-" rating from: www.ssllabs.com
> 
> Now after upgrading to apache-2.2.27 I'm getting "C" because of weak Cipher
> Strength inclusion:
> 
> TLS_RSA_EXPORT_WITH_RC4_40_MD5 (0x3)   WEAK      40
> TLS_RSA_EXPORT_WITH_RC2_CBC_40_MD5 (0x6)   WEAK      40
> TLS_RSA_EXPORT_WITH_DES40_CBC_SHA (0x8)   WEAK      40
> TLS_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA (0x14)   DH 512 bits (p: 64, g: 1,
> Ys: 64)   FS   WEAK      40 TLS_RSA_WITH_DES_CBC_SHA (0x9)   WEAK      56
> TLS_DHE_RSA_WITH_DES_CBC_SHA (0x15)   DH 1024 bits (p: 128, g: 1, Ys: 128) 
>  FS   WEAK      56
> 
> How to get rid of it?  I've tired setting in 00_default_ssl_vhost.conf
> 
> SSLProtocol all -SSLv2 -SSLv3

It should be better to set -ALL to disable all protocols and then explicitly 
enable only the protocols that you want to trust as secure, e.g. +TLSv1.2

> SSLCompression Off
> SSLCipherSuite "EECDH+AESGCM EDH+AESGCM EECDH -RC4 EDH -CAMELLIA -SEED
> !aNULL !eNULL !LOW !3DES !MD5 !EXP !PSK !SRP !DSS !RC4"

This leaves the anonymous DH enabled which will give you a poor rating.

> or
> SSLProtocol -ALL +SSLv3 +TLSv1 +TLSv1.2
> SSLCipherSuite ALL:!ADH:RC4+RSA:+HIGH:+MEDIUM:!LOW:!SSLv2:!EXPORT

This enables RC4 which may give you a poor rating - not sure.  Better you move 
it down the list so that more secure ciphers are tried first.

> nothing helps, I'm still getting "C" because of weak Cipher Strength
> inclusion.

This is because you inadvertently allow weak ciphers in your directives above.

Try running openssl ciphers -v <string> to see what your directives allow and 
in what order.  Then modify them accordingly.

HTH.
-- 
Regards,
Mick

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