nfs security update

CentOS Errata and Security Advisory CESA-2009:1321

The nfs-utils package provides a daemon for the kernel NFS server and
related tools.

It was discovered that nfs-utils did not use tcp_wrappers correctly.
Certain hosts access rules defined in “/etc/hosts.allow” and
“/etc/hosts.deny” may not have been honored, possibly allowing remote
attackers to bypass intended access restrictions. (CVE-2008-4552)

This updated package also fixes the following bugs:

• the “LOCKD_TCPPORT” and “LOCKD_UDPPORT” options in “/etc/sysconfig/nfs”
  were not honored: the lockd daemon continued to use random ports. With this
  update, these options are honored. (BZ#434795)

• it was not possible to mount NFS file systems from a system that has
  the “/etc/” directory mounted on a read-only file system (this could occur
  on systems with an NFS-mounted root file system). With this update, it is
  possible to mount NFS file systems from a system that has “/etc/” mounted
  on a read-only file system. (BZ#450646)

• arguments specified by “STATDARG=” in “/etc/sysconfig/nfs” were removed
  by the nfslock init script, meaning the arguments specified were never
  passed to rpc.statd. With this update, the nfslock init script no longer
  removes these arguments. (BZ#459591)

• when mounting an NFS file system from a host not specified in the NFS
  server’s “/etc/exports” file, a misleading “unknown host” error was logged
  on the server (the hostname lookup did not fail). With this update, a
  clearer error message is provided for these situations. (BZ#463578)

• the nhfsstone benchmark utility did not work with NFS version 3 and 4.
  This update adds support to nhfsstone for NFS version 3 and 4. The new
  nhfsstone “-2”, “-3”, and “-4” options are used to select an NFS version
  (similar to nfsstat(8)). (BZ#465933)

• the exportfs(8) manual page contained a spelling mistake, “djando”, in
  the EXAMPLES section. (BZ#474848)

• in some situations the NFS server incorrectly refused mounts to hosts
  that had a host alias in a NIS netgroup. (BZ#478952)

• in some situations the NFS client used its cache, rather than using
  the latest version of a file or directory from a given export. This update
  adds a new mount option, “lookupcache=”, which allows the NFS client to
  control how it caches files and directories. Note: The Red Hat Enterprise
  Linux 5.4 kernel update (the fourth regular update) must be installed in
  order to use the “lookupcache=” option. Also, “lookupcache=” is currently
  only available for NFS version 3. Support for NFS version 4 may be
  introduced in future Red Hat Enterprise Linux 5 updates. Refer to Red Hat
  Bugzilla #511312 for further information. (BZ#489335)

Users of nfs-utils should upgrade to this updated package, which contains
backported patches to correct these issues. After installing this update,
the nfs service will be restarted automatically.

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-announce/2009-September/078309.html
https://lists.centos.org/pipermail/centos-announce/2009-September/078310.html

Affected packages:
nfs-utils

Upstream details at:
https://access.redhat.com/errata/RHSA-2009:1321