GNU screen before 4.5.1 allows local users to modify arbitrary files and consequently gain root privileges by leveraging improper checking of logfile permissions.Referenceshttp://git.savannah.gnu.org/cgit/screen.git/tree/src/ChangeLog?h=v.4.5.1http://savannah.gnu.org/bugs/?50142http://www.openwall.com/lists/oss-security/2017/01/29/3http://git.savannah.gnu.org/cgit/screen.git/patch/?id=1c6d2817926d30c9a7a97d99af7ac5de4a5845b8http://www.securityfocus.com/bid/95873https://lists.gnu.org/archive/html/screen-devel/2017-01/msg00025.html
