Add CVE-2018-1000201 for ffi. (#351)

Author: drn

gems/ffi/CVE-2018-1000201.yml

@@ -0,0 +1,22 @@
+---
+gem: ffi
+cve: 2018-1000201
+url: https://github.com/ffi/ffi/releases/tag/1.9.24
+title: ruby-ffi DDL loading issue on Windows OS
+date: 2018-06-22
+
+description: |
+  ruby-ffi version 1.9.23 and earlier has a DLL loading issue which can be
+  hijacked on Windows OS, when a Symbol is used as DLL name instead of a String
+  This vulnerability appears to have been fixed in v1.9.24 and later.
+
+cvss_v2: 6.8
+cvss_v3: 7.8
+
+patched_versions:
+  - ">= 1.9.24"
+
+related:
+  url:
+    - https://github.com/ffi/ffi/commit/09e0c6076466b4383da7fa4e13f714311109945a
+    - https://github.com/ffi/ffi/commit/e0fe486df0e117ed67b0282b6ada04b7214ca05c