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Category:   Application (Generic)  >   Nagios Vendors:
(Red Hat Issues Fix) Nagios 'nagios.log' File Permissions Error Lets Local Users Obtain Root Privileges
SecurityTracker Alert ID:  1037746
SecurityTracker URL:
CVE Reference:   CVE-2016-9566   (Links to External Site)
Date:  Jan 31 2017
Impact:   Modification of system information, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): prior to 4.2.4
Description:   A vulnerability was reported in Nagios. A local user can obtain root privileges on the target system.

The software does not drop root privileges before opening the '/usr/local/nagios/var/nagios.log' file for writing. A local user with 'nagios' user or 'nagios' group privileges can create a symbolic link (symlink) from a critical file on the target system to the log file to cause the symlinked file to be created with root privileges.

The original advisory and a demonstration exploit is available at:

Dawid Golunski reported this vulnerability.

Impact:   A local user can obtain root privileges on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  7

Message History:   This archive entry is a follow-up to the message listed below.
Dec 17 2016 Nagios 'nagios.log' File Permissions Error Lets Local Users Obtain Root Privileges

 Source Message Contents

Subject:  [RHSA-2017:0211-01] Important: nagios security update

Hash: SHA1

                   Red Hat Security Advisory

Synopsis:          Important: nagios security update
Advisory ID:       RHSA-2017:0211-01
Product:           Red Hat Enterprise Linux OpenStack Platform
Advisory URL:
Issue date:        2017-01-31
CVE Names:         CVE-2008-7313 CVE-2014-5008 CVE-2014-5009 
                   CVE-2016-9565 CVE-2016-9566 

1. Summary:

An update for nagios is now available for Red Hat Enterprise Linux
OpenStack Platform 5.0 (Icehouse) for RHEL 7.

Red Hat Product Security has rated this update as having a security impact
of Important. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available for each vulnerability
from the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux OpenStack Platform 5.0 (Icehouse) for RHEL 7 - x86_64

3. Description:

Nagios is a program that monitors hosts and services on your network, and
has the ability to send email or page alerts when a problem arises or is
resolved. Nagios is written in C and designed to run under Linux (and some
other *NIX variants) as a background process, intermittently running checks
on various services that you specify. The actual service checks are
performed by separate "plugin" programs which return the status of the
checks to Nagios. Nagios plugins are available at This package provides the core
program, web interface, and documentation files for Nagios. Development
files are built as a separate package.

Security Fix(es):

* Various command-execution flaws were found in the Snoopy library included
with Nagios. These flaws allowed remote attackers to execute arbitrary
commands by manipulating Nagios HTTP headers. (CVE-2008-7313,
CVE-2014-5008, CVE-2014-5009)

* It was found that an attacker who could control the content of an RSS
feed could execute code remotely using the Nagios web interface. This flaw
could be used to gain access to the remote system and in some scenarios
control over the system. (CVE-2016-9565)

* A privileges flaw was found in Nagios where log files were unsafely
handled. An attacker who could control Nagios logging configuration
('nagios' user/group) could exploit the flaw to elevate their access to
that of a privileged user. (CVE-2016-9566)

Red Hat would like to thank Dawid Golunski for reporting CVE-2016-9565 and

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

5. Bugs fixed (

1121497 - CVE-2008-7313 CVE-2014-5008 CVE-2014-5009 snoopy: incomplete fixes for command execution flaws
1402869 - CVE-2016-9566 nagios: Privilege escalation issue
1405363 - CVE-2016-9565 nagios: Command injection via curl in MagpieRSS

6. Package List:

Red Hat Enterprise Linux OpenStack Platform 5.0 (Icehouse) for RHEL 7:



These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from

7. References:

8. Contact:

The Red Hat security contact is <>. More contact
details at

Copyright 2017 Red Hat, Inc.
Version: GnuPG v1


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