[Info] How to ensure that Apache does not allow SSL 2.0/SSL 3.0 protocol?

Created:

2016-11-16 13:11:51 UTC

Modified:

2017-08-08 13:23:34 UTC

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[Info] How to ensure that Apache does not allow SSL 2.0/SSL 3.0 protocol?

Applicable to:

  • Plesk for Linux/Unix

Symptom

The warning is shown in security report:

The remote service encrypts traffic using a protocol with known weaknesses. Description : The remote service accepts connections encrypted using SSL 2.0, which reportedly suffers from several cryptographic flaws and has been deprecated for several years. An attacker may be able to exploit these issues to conduct man-in-the-middle attacks or decrypt communications between the affected service and clients.

Resolution

SSL protocols that are used by Apache can be set by means of "SSLProtocol" option.. To disable SSL 2.0 or SSL 3.0 protocol you should modify the /etc/httpd/conf.d/ssl.conf or httpd.conf , adding the line:

SSLProtocol all -SSLv2 -SSLv3

Restart Apache after configuration files modification.

AdditionalInformation

Additional information about mod_ssl can be found here .

Note: Real path to Apache or SSL configuration files can be different depending on operation system installed. For more information about apache web server related paths please refer to KB5440 article.

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