Important: autofs5 security updateThe autofs utility controls the operation of the automount daemon, whichautomatically mounts and unmounts file systems after a period ofinactivity. The autofs version 5 package was made available as atechnology preview in Red Hat Enterprise Linux version 4.6.There was a security issue with the default installed configuration ofautofs version 5 whereby the entry for the "hosts" map did not specify the"nosuid" mount option. A local user with control of a remote nfs servercould create a setuid root executable within an exported filesystem on theremote nfs server that, if mounted using the default hosts map, would allowthe user to gain root privileges. (CVE-2007-5964)Due to the fact that autofs version 5 always mounted hosts map entries suidby default, autofs has now been altered to always use the "nosuid" optionwhen mounting from the default hosts map. The "suid" option must beexplicitly given in the master map entry to revert to the old behavior.This change affects only the hosts map which corresponds to the /net entryin the default configuration.Users are advised to upgrade to these updated autofs5 packages, whichresolve this issue.Red Hat would like to thank Josh Lange for reporting this issue.