Hello,
I'm sorry if this is a simple question. I'm fairly new to running an Apache web server. I lease a virtual private server (VPS) from GoDaddy that's running CentOS 6.8 Final with cPanel / WHM v56.0.25. Apache is version 2.4.18 (Unix) with OpenSSL/1.0.1e-fips.
I'm trying to disable weak ciphers. Here's the nmap command I run with the output:
./nmap --script ssl-cert,ssl-enum-ciphers -p 443
mydomain.com
Host is up (0.000083s latency).
PORT STATE SERVICE
443/tcp open https
| Issuer: commonName=Let's Encrypt Authority X3/organizationName=Let's Encrypt/countryName=US
| Public Key type: rsa
| Public Key bits: 2048
| Signature Algorithm: sha256WithRSAEncryption
| Not valid before: 2016-07-13T03:49:00
| Not valid after: 2016-10-11T03:49:00
| MD5: e2dd d74b 6978 0d0e 9a7c 0aec c5ed baee
|_SHA-1: 4eef ac38 a8fe 99aa 816b 005a 9849 c674 cd39 98d6
| ssl-enum-ciphers:
| TLSv1.0:
| ciphers:
| TLS_DHE_RSA_WITH_AES_128_CBC_SHA (dh 2048) - A
| TLS_DHE_RSA_WITH_AES_256_CBC_SHA (dh 2048) - A
| TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA (dh 2048) - A
| TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA (dh 2048) - A
| TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (secp256r1) - A
| TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (secp256r1) - A
| TLS_RSA_WITH_3DES_EDE_CBC_SHA (rsa 2048) - C
| TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
| TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A
| TLS_RSA_WITH_CAMELLIA_128_CBC_SHA (rsa 2048) - A
| TLS_RSA_WITH_CAMELLIA_256_CBC_SHA (rsa 2048) - A
| compressors:
| NULL
| cipher preference: client
| TLSv1.1:
| ciphers:
| TLS_DHE_RSA_WITH_AES_128_CBC_SHA (dh 2048) - A
| TLS_DHE_RSA_WITH_AES_256_CBC_SHA (dh 2048) - A
| TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA (dh 2048) - A
| TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA (dh 2048) - A
| TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (secp256r1) - A
| TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (secp256r1) - A
| TLS_RSA_WITH_3DES_EDE_CBC_SHA (rsa 2048) - C
| TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
| TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A
| TLS_RSA_WITH_CAMELLIA_128_CBC_SHA (rsa 2048) - A
| TLS_RSA_WITH_CAMELLIA_256_CBC_SHA (rsa 2048) - A
| compressors:
| NULL
| cipher preference: client
| TLSv1.2:
| ciphers:
| TLS_DHE_RSA_WITH_AES_128_CBC_SHA (dh 2048) - A
| TLS_DHE_RSA_WITH_AES_128_CBC_SHA256 (dh 2048) - A
| TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 (dh 2048) - A
| TLS_DHE_RSA_WITH_AES_256_CBC_SHA (dh 2048) - A
| TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 (dh 2048) - A
| TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 (dh 2048) - A
| TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA (dh 2048) - A
| TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA (dh 2048) - A
| TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (secp256r1) - A
| TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 (secp256r1) - A
| TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (secp256r1) - A
| TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (secp256r1) - A
| TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (secp256r1) - A
| TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (secp256r1) - A
| TLS_RSA_WITH_3DES_EDE_CBC_SHA (rsa 2048) - C
| TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
| TLS_RSA_WITH_AES_128_CBC_SHA256 (rsa 2048) - A
| TLS_RSA_WITH_AES_128_GCM_SHA256 (rsa 2048) - A
| TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A
| TLS_RSA_WITH_AES_256_CBC_SHA256 (rsa 2048) - A
| TLS_RSA_WITH_AES_256_GCM_SHA384 (rsa 2048) - A
| TLS_RSA_WITH_CAMELLIA_128_CBC_SHA (rsa 2048) - A
| TLS_RSA_WITH_CAMELLIA_256_CBC_SHA (rsa 2048) - A
| compressors:
| NULL
| cipher preference: client
|_ least strength: C
Nmap done: 1 IP address (1 host up) scanned in 0.73 seconds
It's those TLS_RSA_WITH_3DES_EDE_CBC_SHA (rsa 2048) that I want to do away with but I'm not sure how. In cPanel, under the Apache global configuration section, I see for the SSL Cipher Suite:
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
I'd of thought that TLS_RSA_WITH_3DES_EDE_CBC_SHA would be in there and I'd just have to disable it. Does anyone have any ideas how I can disable this cipher? Thank you!
Sincerely,
Ken Swarthout
