RHEL 6 : nfs-utils (RHSA-2011:1534)

This script is Copyright (C) 2011-2014 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

Updated nfs-utils packages that fix two security issues, various bugs,
and add one enhancement are now available for Red Hat Enterprise Linux
6.

The Red Hat Security Response Team has rated this update as having low
security impact. Common Vulnerability Scoring System (CVSS) base
scores, which give detailed severity ratings, are available for each
vulnerability from the CVE links in the References section.

The nfs-utils packages provide a daemon for the kernel Network File
System (NFS) 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
(Network Information Service) netgroup, an attacker could possibly
gain access to other directories exported to a specific host or
subnet, bypassing intended access restrictions. (CVE-2011-2500)

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 several bugs and adds an enhancement.
Documentation for these bug fixes and the enhancement will be
available shortly from the Technical Notes document, linked to in the
References section.

Users of nfs-utils are advised to upgrade to these updated packages,
which contain backported patches to resolve these issues and add this
enhancement. After installing this update, the nfs service will be
restarted automatically.

See also :

https://www.redhat.com/security/data/cve/CVE-2011-1749.html
https://www.redhat.com/security/data/cve/CVE-2011-2500.html
https://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/
http://rhn.redhat.com/errata/RHSA-2011-1534.html

Solution :

Update the affected nfs-utils and / or nfs-utils-debuginfo packages.

Risk factor :

High / CVSS Base Score : 7.5
(CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P)
CVSS Temporal Score : 6.5
(CVSS2#E:ND/RL:OF/RC:C)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 57015 ()

Bugtraq ID: 47532
48465

CVE ID: CVE-2011-1749
CVE-2011-2500