Red Hat Security Advisory 2011-1534-03 - The nfs-utils packages provide a daemon for the kernel Network File System server, and related tools such as the mount.nfs, umount.nfs, and showmount programs. A flaw was found in the way nfs-utils performed IP based authentication of mount requests. In configurations where a directory was exported to a group of systems using a DNS wildcard or NIS netgroup, an attacker could possibly gain access to other directories exported to a specific host or subnet, bypassing intended access restrictions.
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