[Nessus] SSL RC4 Cipher Suites Supported (Bar Mitzvah)

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[Nessus] SSL RC4 Cipher Suites Supported (Bar Mitzvah)

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Description

The remote host supports the use of RC4 in one or more cipher suites.
The RC4 cipher is flawed in its generation of a pseudo-random stream of bytes so that a wide variety
of small biases are introduced into the stream, decreasing its randomness.
If plaintext is repeatedly encrypted (e.g., HTTP cookies), and an attacker is able to obtain many
(i.e., tens of millions) ciphertexts, the attacker may be able to derive the plaintext.

Solution

Reconfigure the affected application, if possible, to avoid use of RC4 ciphers. Consider using TLS 1.2
with AES-GCM suites subject to browser and web server support.

Solução SecurityCenter:

/opt/sc4/support/conf/sslciphers.conf
# SSL Ciphers
# Antigo
# SSLCipherSuite DES-CBC3-MD5:RC2-CBC-MD5:RC4-MD5:DES-CBC3-SHA:RC4-MD5:RC4-SHA:DES-CBC3-SHA:AES128-SHA:AES256-SHA:RC4-MD5:RC4-SHA
# Novo
SSLCipherSuite ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+3DES:!aNULL:!MD5:!DSS
SSLProtocol -All +TLSv1

Código: Selecionar todos

/etc/init.d/SecurityCenter restart
Solução Apache:

/etc/httpd/conf/ssl.conf
# SSL Ciphers
# Antigo
# SSLCipherSuite DES-CBC3-MD5:RC2-CBC-MD5:RC4-MD5:DES-CBC3-SHA:RC4-MD5:RC4-SHA:DES-CBC3-SHA:AES128-SHA:AES256-SHA:RC4-MD5:RC4-SHA
# Novo
SSLCipherSuite ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+3DES:!aNULL:!MD5:!DSS
SSLProtocol -All +TLSv1

Código: Selecionar todos

service httpd restart
Editado pela última vez por marceloleaes em 11 Mar 2016 11:25, em um total de 1 vez.


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