perl allows for insecure configuration. A race condition in the rmtree and remove_tree functions in the File-Path module allows attackers to set the mode on arbitrary files via vectors involving directory-permission loosening logic.
cpansearch.perl.org/src/JKEENAN/File-Path-2.13/Changes
security.cucumberlinux.com/security/details.php?id=153
www.debian.org/security/2017/dsa-3873
www.securityfocus.com/bid/99180
www.securitytracker.com/id/1038610
rt.cpan.org/Ticket/Display.html?id=121951
security-tracker.debian.org/tracker/CVE-2017-6512
security.gentoo.org/glsa/201709-12
usn.ubuntu.com/3625-1/
usn.ubuntu.com/3625-2/