OpenSSL has a critical security vulnerability that needs to be patched right away.
This bug in OpenSSL has been found affecting versions 1.0.1 through 1.0.1f (inclusive) and 1.0.2-beta.
Upgrading OpenSSL version to 1.0.1g is fixing this security vulnerability.
Below the single command line to compiling and install the last openssl version.
Replace old openssl binary file by the new one via a symlink.
You are all good !
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This is not fixing Nginx and Apache server who have to be recompile with 1.0.1g openSSL sources.