SSL RC4 Cipher Suites Supported

This script is Copyright (C) 2013-2015 Tenable Network Security, Inc.


Synopsis :

The remote service supports the use of the RC4 cipher.

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.

See also :

http://www.nessus.org/u?217a3666
http://cr.yp.to/talks/2013.03.12/slides.pdf
http://www.isg.rhul.ac.uk/tls/
http://www.imperva.com/docs/HII_Attacking_SSL_when_using_RC4.pdf

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.

Risk factor :

Medium / CVSS Base Score : 4.3
(CVSS2#AV:N/AC:M/Au:N/C:P/I:N/A:N)
CVSS Temporal Score : 3.7
(CVSS2#E:ND/RL:OF/RC:C)
Public Exploit Available : false

Family: General

Nessus Plugin ID: 65821 ()

Bugtraq ID: 58796
73684

CVE ID: CVE-2013-2566
CVE-2015-2808