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mod_ssl Bug and SSL Labs Renegotiation Test

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:

Acknowledgements

We would like to thank the Apache Security Team for working with us on this issue.

SSL Labs Grade Change for TLS 1.0 and TLS 1.1 Protocols

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:

Browser Name Date
Microsoft IE and Edge First half of 2020
Mozilla Firefox March 2020
Safari/Webkit March 2020
Google Chrome January 2020

 

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