MailChimp STS throws an error with new upgrade of libssl

How is this an issue with MailChimp module?

Because you upgrade libssl and the Mailchimp module breaks. Is the module going to require an old insecure version of libSSL?

with libssl1.0.0: 1.0.1a-3
"There was a problem accessing the MailChimp STS service: Could not connect (ERR 0: )"

Here's the relevant code for using a secure connection if you want to submit a patch for how it should change. Also, OpenSSL lists 1.0.1a-3 as unstable.

    if ($this->secure) {
      $sock = fsockopen("ssl://" . $host, 443, $errno, $errstr, 30);
    }
    else {
      $sock = fsockopen($host, 80, $errno, $errstr, 30);
    }
    if (!$sock) {
      $this->errorMessage = "Could not connect (ERR $errno: $errstr)";
      $this->errorCode = "-99";
      ob_end_clean();
      return FALSE;
    }

Looks like you're right, it is a bug in libssl 1.0.1 and not in the Mailchimp module.

Here's two patches for libssl 1.0.1:

https://bbs.archlinux.org/viewtopic.php?pid=1079646#p1079646