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Thank you, Kelly Hi Phil, you can use the following command to debug SSL server and verify which SSL-Session Protocol is active. Server public key is 2048 bit Compression: NONE Expansion: NONE SSL-Session: Protocol : TLSv1 Cipher : DHE-RSA-AES256-SHA ....... Server public key is 2048 bit Compression: NONE Expansion: NONE SSL-Session: Protocol : TLSv1 Take note, from the output above you will see "ssl handshake failure on both sslv2 and sslv3", that mean both of these SSL-Session Protocols are not active or totally disabled. I know that RH doesn't support Cent OS, I just wanted to make it aware that Cent OS based OS's with Plesk Control Panel is also showing as Vulnerable, all websites I've tested on that server show vulnerable.
openssl s_client -connect target_host:443 CONNECTED(00000003) ..... To verify if sslv3 is active: openssl s_client -ssl3 -connect taget_host:443 CONNECTED(00000003) 23960:error:14094410: SSL routines: SSL3_READ_BYTES:sslv3 alert handshake failure:s3_pkt.c:1053: SSL alert number 40 23960:error:1409E0E5: SSL routines: SSL3_WRITE_BYTES:ssl handshake failure:s3_pkt.c:530: To verify if sslv2 is active: openssl s_client -ssl2 -connect target_host:443 CONNECTED(00000003) 23964:error:1407F0E5: SSL routines: SSL2_WRITE:ssl handshake failure:s2_pkt.c:428: To verify if tlsv1 is active: openssl s_client -tls1 -connect target_host:443 .... On the other hand, you see TLSv1 under SSL-Session - Protocol is active, that mean your configuration is fine and you have nothing worry about. Even though I've got SSLProtocol All -SSLv2 -SSLv3 in the file. These two servers were not setup the same way as my other servers so I made the changes necessary to do so.
To avoid this vulnerability, Red Hat recommends disabling SSL and using only TLSv1.1 or TLSv1.2.
An attacker that controls the network between the client and the server can interfere with any attempted handshake offering TLS 1.0 or later and force both client and server to use SSL 3.0 protocol instead.
This vulnerability allows a man-in-the-middle attacker to decrypt ciphertext using a padding oracle side-channel attack.
For more information about this vulnerability, refer to the following article: POODLE: SSLv3.0 vulnerability (CVE-2014-3566) This solution is part of Red Hat’s fast-track publication program, providing a huge library of solutions that Red Hat engineers have created while supporting our customers.
Moreover, you can also enable the following in your /etc/httpd/conf.d/SSLHonor Cipher Order On SSLCipher Suite ECDH AESGCM: DH AESGCM: ECDH AES256: DH AES256: ECDH AES128: DH AES: ECDH 3DES: DH 3DES: RSA AESGCM: RSA AES: RSA 3DES:! In the Vhost file I added the components of the SSLProtocal rather than assuming they would be called in the file. Did a search for all config files that may contain "SSLProtocol" and got these results (the first match is a comment from my first attempt, ignore).
So I should have only TLSv1 operating $ grep -R -i SSLProtocol /etc/httpd/conf* /etc/httpd/conf.d/ssl.conf:#SSLProtocol All -SSLv2 -SSLv3 /etc/httpd/conf.d/ssl.conf: SSLProtocol -All TLSv1 But I'm still getting both SSLv2 and SSLv3 showing as still configured from multiple sources (script, as well as a few different SSL checkers I've tried so far).