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If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important. If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.
Vulnerability Assessment Details
Check for the version of the nfs packages
Detailed Explanation for this Vulnerability Assessment
An updated nfs-utils package that fixes various security issues is now
The nfs-utils package provides a daemon for the kernel NFS server and
related tools, providing a much higher level of performance than the
traditional Linux NFS server used by most users.
This package also contains the showmount program. Showmount queries
the mount daemon on a remote host for information about the NFS
(Network File System) server on the remote host.
SGI reported that the statd daemon did not properly handle the SIGPIPE
signal. A misconfigured or malicious peer could cause statd to crash,
leading to a denial of service. The Common Vulnerabilities and Exposures
project (cve.mitre.org) has assigned the name CVE-2004-1014 to this issue.
Arjan van de Ven discovered a buffer overflow in rquotad. On 64-bit
architectures, an improper integer conversion can lead to a buffer
overflow. A possible hacker with access to an NFS share could send a specially
crafted request which could lead to the execution of arbitrary code. The
Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned
the name CVE-2004-0946 to this issue.
Additionally, this updated package addresses the following issues:
- The UID of the nfsnobody account has been fixed for 32-bit and 64-bit
machines. Because the st_uid field of the stat structure is an unsigned
integer, an actual value of -2 cannot be used when creating the account, so
the decimal value of -2 is used. On a 32-bit machine, the decimal value of
-2 is 65534 but on a 64-bit machine it is 4294967294. This errata enables
the nfs-utils post-install script to detect the target architecture, so an
appropriate decimal value is used.
All users of nfs-utils should upgrade to this updated package, which
resolves these issues.
Solution : http://rhn.redhat.com/errata/RHSA-2004-583.html
Network Security Threat Level: High
Networks Security ID:
Vulnerability Assessment Copyright: This script is Copyright (C) 2004 Tenable Network Security
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