RHEL 5 : nfs-utils (RHSA-2009:1321)
High Nessus Plugin ID 40838
SynopsisThe remote Red Hat host is missing a security update.
DescriptionAn updated nfs-utils package that fixes a security issue and several bugs is now available.
This update has been rated as having low security impact by the Red Hat Security Response Team.
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.
* 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.
* 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.
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.
SolutionUpdate the affected nfs-utils package.