Update README.md

Author: David Davidson

screen2root/README.md

@@ -1 +1,13 @@
-## screen2root
+# screen2root
+
+## TL;DR
+On systems where screen is version 4.5.0 (Screen version 4.05.00 (GNU) 10-Dec-16), and setuid root, you can use it to create arbritary files with root permissions containing arbritary content.
+
+This PoC creates an /etc/ld.so.preload file pointing to a library that creates a setuid root shell and then calls screen again to trigger it.
+
+TL;DR you get root.
+
+Original bug report is [here](https://lists.gnu.org/archive/html/screen-devel/2017-01/msg00025.html)
+
+## Screenshot
+[![lol](https://raw.githubusercontent.com/XiphosResearch/exploits/master/screen2root/screen2root.png)]