Add CVE-2018-6789 to security/

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+CVE-2018-6789
+=============
+
+There is a buffer overflow in an utility function, if some pre-conditions
+are met.  Using a handcrafted message, remote code execution seems to be
+possible.
+
+A patch exists already and is being tested.
+
+Currently we're unsure about the severity, we *believe*, an exploit
+is difficult. A mitigation isn't known.
+
+Next steps:
+
+* t0:     Distros will get access to our "security" non-public git repo
+          (based on the SSH keys known to us)
+* t0 +7d: Patch will be published on the official public git repo
+
+t0 will be around 2018-02-08.
+
+Timeline
+--------
+
+* 2018-02-05 Report from Meh Chang <meh@devco.re> via exim-security mailing list
+* 2018-02-06 Request CVE on https://cveform.mitre.org/ (heiko)
+             CVE-2018-6789
+* 2018-02-07 Announcement to the public via exim-users, exim-maintainers
+             mailing lists and on oss-security mailing list