Merge pull request #26 from kinow/add-security-discussions

Add security discussions document

docs/security-discussions.md

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+# Security Discussions
+
+This document is used for discussion around security in Cylc repositories.
+
+## CVE's in Cylc
+
+At the moment we are working to add a `SECURITY.md` file to `cylc/cylc-flow`.
+This document includes information on how Cylc manages security issues, and
+how users can report it safely. Other repositories can link to that document.
+
+However, in case of a security bug, the only way of knowing if a version of
+our projects is safe or not, is via its change log.
+
+There are global CVE databases, maintained by organizations that work
+to collect these issues and make them available to interested parties via
+a simple web interface, with a search form.
+
+This way security professionals are able to quickly assess if a version of
+some software has ever had a security issue, and whether that version can
+be used in his/her environment safely.
+
+Perhaps later we could also get one or two developers familiarised with
+the process to request CVE's, and start filling (maybe even retroactively)
+requests whenever we find security issues in Cylc projects.
+
+Right now there are no CVE's for Cylc in these databases, even though we have
+old versions that had reports of security issues. Which means users are not able
+to check which versions are safe to use, or whether they need to update their
+environments due to a security incident.
+
+_References:_
+
+- https://cve.mitre.org/cve/request_id.html
+- https://github.com/RedHatProductSecurity/CVE-HOWTO
+- https://thoughtbot.com/blog/handling-security-issues-in-open-source-projects
+- https://www.csoonline.com/article/3157377/application-development/open-source-software-security-challenges-persist.html