Cryptography / SSL RC4 Cipher Suites Supported (Bar Mitzvah)
SSL RC4 Cipher Suites Supported (Bar Mitzvah) is a vulnerability in the encryption of web traffic. It is related to the RC4 stream cipher, which is used in some versions of the SSL/TLS protocol. This vulnerability can allow an attacker to decrypt web traffic and gain access to sensitive information. According to the Common Weakness Enumeration (CWE) directory, this vulnerability is classified as CWE-310, which is an "Insufficient Encryption Strength" vulnerability. The OWASP Testing Guide also states that RC4 is considered weak and should be disabled.
The risk of this vulnerability is that an attacker can gain access to confidential information, such as usernames, passwords, and other sensitive data. This can lead to data breaches, financial losses, or other forms of damage. A risk assessment should be done to determine the potential impact of this vulnerability and to make sure the appropriate measures are taken to reduce the risk.
The best solution to address this vulnerability is to disable RC4 on the server. This can be done by disabling the RC4 protocol in the server's configuration. Additionally, the use of strong ciphers, such as AES or ChaCha20, should be enabled.
Here is an example of disabling RC4 in the Apache web server configuration:
SSLProtocol -all +TLSv1 +TLSv1.1 +TLSv1.2 SSLHonorCipherOrder on SSLCipherSuite "EECDH+ECDSA+AESGCM EECDH+aRSA+AESGCM EECDH+ECDSA+SHA384 EECDH+ECDSA+SHA256 EECDH+aRSA+SHA384 EECDH+aRSA+SHA256 EECDH+aRSA+RC4 EDH+aRSA EECDH RC4 !aNULL !eNULL !LOW !3DES !MD5 !EXP !PSK !SRP !DSS"