Gentoo Linux Security Advisory GLSA 200903-06 – An error in nfs-utils allows for bypass of the netgroups restriction. Michele Marcionelli reported that nfs-utils invokes the hosts_ctl() function with the wrong order of arguments, which causes TCP Wrappers to ignore netgroups. Versions less than 1.1.3 are affected.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/75503/glsa-200903-06.txt
Source: https://packetstormsecurity.com/files/75503/Gentoo-Linux-Security-Advisory-200903-6.html