Integer overflow in shadow 4.2.1 allows local users to gain privileges via crafted input to newuidmap.
https://security.gentoo.org/glsa/201706-02
https://github.com/shadow-maint/shadow/issues/27
https://bugzilla.suse.com/show_bug.cgi?id=979282
http://www.securityfocus.com/bid/92055
http://www.openwall.com/lists/oss-security/2016/07/25/7
http://www.openwall.com/lists/oss-security/2016/07/20/2
http://www.openwall.com/lists/oss-security/2016/07/19/7