Recently new vulnerabilities like Zombie POODLE, GOLDENDOODLE, 0-Length OpenSSL and Sleeping POODLE were published for websites that use CBC (Cipher Block Chaining) block cipher modes. These vulnerabilities are applicable only if the server uses TLS 1.2 or TLS 1.1 or TLS 1.0 with CBC cipher modes.
Update May 30, 2019: The grade change described below is now live on https://www.ssllabs.com/
Update March 12, 2019: SSL Labs Renegotiation Test is re-enabled on the development instance, and will be live on the production instance this week.
Update February 20, 2019: To give more time to fix, we will re-enable the SSL Labs Renegotiation Test on March 11, 2019 (two additional weeks).
The Apache Security Team fixed a bug which triggers whenever a client attempts renegotiation with Apache HTTP Server 2.4.37 and OpenSSL 1.1.1. This bug causes the Apache httpd service to consume 100% CPU. Details of the bug can be found at: https://bz.apache.org/bugzilla/show_bug.cgi?id=63052
Local testing by Qualys confirms that the SSL Labs renegotiation test triggers this bug for the above-mentioned server configuration, and can be used to cause the Apache httpd service on a target system to consume 100% CPU.
To allow Apache users time to apply the fix, SSL Labs has disabled the Renegotiation Test for one month, and we will re-enable it on February 25, 2019. While the test is disabled, users will not see the following in SSL Labs reports:
We would like to thank the Apache Security Team for working with us on this issue.
Update 1/16/2020: The grade change is now live on the development server at dev.ssllabs.com. Servers that support TLS 1.0 or TLS 1.1 are capped to B grade on the development server. Deployment to production SSL Labs servers is planned for the very end of January.
Update 10/11/19: The TLS 1.0/1.1 warning changes are now live on www.ssllabs.com. The grade change for supporting TLS 1.0/1.1 is changed from March 2020 to January 2020 as shown below in the “SSL Labs Grade Change” section below and as reflected in the summary messages in SSL Labs results.
Update 11/30/18: Now live on ssllabs.com: In Configuration->Protocols section “TLS 1.1” text color will be changed to Orange by end of November 2018.
TLS 1.0 and TLS 1.1 protocols will be removed from browsers at the beginning of 2020. As there are no fixes or patches that can adequately fix SSL or deprecated TLS, it is critically important that organizations upgrade to a secure alternative as soon as possible.
Various Browser clients have provided approximate deadlines for disabling TLS 1.0 and TLS 1.1 protocol: