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Security Advisory Low: nfs-utils security, bug fix, and enhancement update

Advisory: RHSA-2012:0310-3
Type: Security Advisory
Severity: Low
Issued on: 2012-02-21
Last updated on: 2012-02-21
Affected Products: Red Hat Enterprise Linux (v. 5 server)
Red Hat Enterprise Linux Desktop (v. 5 client)
CVEs (cve.mitre.org): CVE-2011-1749

Details

An updated nfs-utils package that fixes one security issue, various bugs,
and adds one enhancement is now available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having low
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.

The nfs-utils package provides a daemon for the kernel Network File System
(NFS) server, and related tools such as the mount.nfs, umount.nfs, and
showmount programs.

It was found that the mount.nfs tool did not handle certain errors
correctly when updating the mtab (mounted file systems table) file. A
local attacker could use this flaw to corrupt the mtab file.
(CVE-2011-1749)

This update also fixes the following bugs:

* The nfs service failed to start if the NFSv1, NFSv2, and NFSv4 support
was disabled (the MOUNTD_NFS_V1="no", MOUNTD_NFS_V2="no" MOUNTD_NFS_V3="no"
lines in /etc/sysconfig/nfs were uncommented) because the mountd daemon
failed to handle the settings correctly. With this update, the underlying
code has been modified and the nfs service starts successfully in the
described scenario. (BZ#529588)

* When a user's Kerberos ticket expired, the "sh rpc.gssd" messages flooded
the /var/log/messages file. With this update, the excessive logging has
been suppressed. (BZ#593097)

* The crash simulation (SM_SIMU_CRASH) of the rpc.statd service had a
vulnerability that could be detected by ISS (Internet Security Scanner). As
a result, the rpc.statd service terminated unexpectedly with the following
error after an ISS scan:

rpc.statd[xxxx]: recv_rply: can't decode RPC message!
rpc.statd[xxxx]: *** SIMULATING CRASH! ***
rpc.statd[xxxx]: unable to register (statd, 1, udp).

However, the rpc.statd service ignored SM_SIMU_CRASH. This update removes
the simulation crash support from the service and the problem no longer
occurs. (BZ#600497)

* The nfs-utils init scripts returned incorrect status codes in the
following cases: if the rpcgssd and rpcsvcgssd daemon were not configured,
were provided an unknown argument, their function call failed, if a program
was no longer running and a /var/lock/subsys/$SERVICE file existed, if
starting a service under an unprivileged user, if a program was no longer
running and its pid file still existed in the /var/run/ directory. With
this update, the correct codes are returned in these scenarios. (BZ#710020)

* The "nfsstat -m" command did not display NFSv4 mounts. With this update,
the underlying code has been modified and the command returns the list of
all mounts, including any NFSv4 mounts, as expected. (BZ#712438)

* Previously, the nfs manual pages described the fsc mount option; however,
this option is not supported. This update removes the option description
from the manual pages. (BZ#715523)

* The nfs-utils preinstall scriptlet failed to change the default group ID
for the nfsnobody user to 65534. This update modifies the preinstall
scriptlet and the default group ID is changed to 65534 after nfs-utils
upgrade as expected. (BZ#729603)

* The mount.nfs command with the "-o retry" option did not try to mount for
the time specified in the "retry=X" configuration option. This occurred due
to incorrect error handling by the command. With this update, the
underlying code has been fixed and the "-o retry" option works as expected.
(BZ#736677)

In addition, this update adds the following enhancement:

* The noresvport option, which allows NFS clients to use insecure ports
(ports above 1023), has been added to the NFS server configuration options.
(BZ#513094)

All nfs-utils users are advised to upgrade to this updated package, which
resolves these issues and adds this enhancement. After installing this
update, the nfs service will be restarted automatically.


Solution

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/kb/docs/DOC-11259

Updated packages

Red Hat Enterprise Linux (v. 5 server)

SRPMS:
nfs-utils-1.0.9-60.el5.src.rpm
File outdated by:  RHBA-2013:1301
    MD5: f624d78013706c1c955f495aea0bb99a
SHA-256: 983b860e208deddecf8d750bb4847a66efd7554a1b1ff648d982027fb27e5e50
 
IA-32:
nfs-utils-1.0.9-60.el5.i386.rpm
File outdated by:  RHBA-2013:1301
    MD5: 22554a8eb5b82c221834411c71a7be64
SHA-256: 5521667431c473be9a980ae089ac8d6882cb2a0aac66fc4200f827473afe102d
nfs-utils-debuginfo-1.0.9-60.el5.i386.rpm
File outdated by:  RHBA-2013:1301
    MD5: ff0f2055cd91eedeef24f2cfec1aec59
SHA-256: b7fb8d3d3cff89d487d3857ff5b7885ccd4f4c814a04bf6b8bc19cbdab96bcfa
 
IA-64:
nfs-utils-1.0.9-60.el5.ia64.rpm
File outdated by:  RHBA-2013:1301
    MD5: d1c0d7871dff159029df84d1c0c8520b
SHA-256: 64a250bc4c4f25226fbafe0ff883421568f12b00bf4e2ae7e7919e84fcccfa29
nfs-utils-debuginfo-1.0.9-60.el5.ia64.rpm
File outdated by:  RHBA-2013:1301
    MD5: aaa22764aa3617427c57dfaeea8f3b60
SHA-256: 53665ff357ff57c4e185efb2bf8fcd8e9443292cf1634270c19ef2449a0a0f8d
 
PPC:
nfs-utils-1.0.9-60.el5.ppc.rpm
File outdated by:  RHBA-2013:1301
    MD5: 20cd9e3d88bf4f55d31b282c9605d40b
SHA-256: 9f05bcb3c8e1172ed36b864b30af12fbf6f2540eb64757693b7c7b863be3534a
nfs-utils-debuginfo-1.0.9-60.el5.ppc.rpm
File outdated by:  RHBA-2013:1301
    MD5: 7388f52ad917cdbac4827eeb40236c1c
SHA-256: 01d4d430b77061c24316f0f42f90b9d4b7c3a57f717eff8352f73e2fbc3c9e98
 
s390x:
nfs-utils-1.0.9-60.el5.s390x.rpm
File outdated by:  RHBA-2013:1301
    MD5: 7796b82e2efb84d2dea6d24b1c31ebfc
SHA-256: da09e83ebb96268e1294488d01afaa14815ae45c4da9c9246ed3898880aa23f5
nfs-utils-debuginfo-1.0.9-60.el5.s390x.rpm
File outdated by:  RHBA-2013:1301
    MD5: e798a55574835238bdf6610457a8de3e
SHA-256: 242f5e9b943d975085c93d3f62a9bbf30c05cf816ea1a9ce94672df8b7545107
 
x86_64:
nfs-utils-1.0.9-60.el5.x86_64.rpm
File outdated by:  RHBA-2013:1301
    MD5: 1320cb197d3931957907d729ba82fb30
SHA-256: f0e7ff57f4825fda5622a3ab6227fe7dca15acd6b01a7353960373278ce24176
nfs-utils-debuginfo-1.0.9-60.el5.x86_64.rpm
File outdated by:  RHBA-2013:1301
    MD5: fdf1cbd5081c32ea6eb5df4d6a3daec4
SHA-256: 91fa2815f20a448c6ebbc1fd4a75a9465824372db953a41ce7af79c5ccb8de2c
 
Red Hat Enterprise Linux Desktop (v. 5 client)

SRPMS:
nfs-utils-1.0.9-60.el5.src.rpm
File outdated by:  RHBA-2013:1301
    MD5: f624d78013706c1c955f495aea0bb99a
SHA-256: 983b860e208deddecf8d750bb4847a66efd7554a1b1ff648d982027fb27e5e50
 
IA-32:
nfs-utils-1.0.9-60.el5.i386.rpm
File outdated by:  RHBA-2013:1301
    MD5: 22554a8eb5b82c221834411c71a7be64
SHA-256: 5521667431c473be9a980ae089ac8d6882cb2a0aac66fc4200f827473afe102d
nfs-utils-debuginfo-1.0.9-60.el5.i386.rpm
File outdated by:  RHBA-2013:1301
    MD5: ff0f2055cd91eedeef24f2cfec1aec59
SHA-256: b7fb8d3d3cff89d487d3857ff5b7885ccd4f4c814a04bf6b8bc19cbdab96bcfa
 
x86_64:
nfs-utils-1.0.9-60.el5.x86_64.rpm
File outdated by:  RHBA-2013:1301
    MD5: 1320cb197d3931957907d729ba82fb30
SHA-256: f0e7ff57f4825fda5622a3ab6227fe7dca15acd6b01a7353960373278ce24176
nfs-utils-debuginfo-1.0.9-60.el5.x86_64.rpm
File outdated by:  RHBA-2013:1301
    MD5: fdf1cbd5081c32ea6eb5df4d6a3daec4
SHA-256: 91fa2815f20a448c6ebbc1fd4a75a9465824372db953a41ce7af79c5ccb8de2c
 
(The unlinked packages above are only available from the Red Hat Network)

Bugs fixed (see bugzilla for more information)

697975 - CVE-2011-1749 nfs-utils: mount.nfs fails to anticipate RLIMIT_FSIZE


References



These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from:
https://www.redhat.com/security/team/key/#package

The Red Hat security contact is secalert@redhat.com. More contact details at http://www.redhat.com/security/team/contact/