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Category:   Application (Generic)  >   Nagios Vendors:
(Red Hat Issues Fix) Nagios Command Injection Flaw in RSS Feed Reader Component Lets Remote Users Execute Arbitrary Code on the Target System
SecurityTracker Alert ID:  1037788
SecurityTracker URL:
CVE Reference:   CVE-2016-9565   (Links to External Site)
Date:  Feb 7 2017
Impact:   Execution of arbitrary code via network, Modification of system information, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): prior to 4.2.2
Description:   A vulnerability was reported in Nagios. A remote user can execute arbitrary code on the target system.

A remote user that can impersonate an RSS feed server can return specially crafted data to exploit an input validation flaw in the RSS feed reader component and inject parameters to a curl command executed by the feed reader component. As a result, the remote user can write files to the target system and cause the files to be executed by the target Nagios service.

The original advisory and a demonstration exploit is available at:

Dawid Golunski (@dawid_golunski) reported this vulnerability.

Impact:   A remote user can write files to and execute arbitrary code 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:   Input validation 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 Command Injection Flaw in RSS Feed Reader Component Lets Remote Users Execute Arbitrary Code on the Target System

 Source Message Contents

Date:  Tue, 7 Feb 2017 12:11:36 +0000
Subject:  [RHSA-2017:0258-01] Important: nagios security update

Hash: SHA1

                   Red Hat Security Advisory

Synopsis:          Important: nagios security update
Advisory ID:       RHSA-2017:0258-01
Product:           Red Hat Gluster Storage
Advisory URL:
Issue date:        2017-02-07
CVE Names:         CVE-2016-9565 CVE-2016-9566 

1. Summary:

An update for nagios is now available for Red Hat Gluster Storage 3.1 for

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 Gluster Storage Nagios 3.1 on RHEL-7 - x86_64
Red Hat Gluster Storage Server 3.1 on 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

Security Fix(es):

* 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 privilege escalation flaw was found in the way Nagios handled log
files. An attacker able to control the Nagios logging configuration (the
'nagios' user/group) could use this flaw to elevate their privileges to
root. (CVE-2016-9566)

4. Solution:

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

5. Bugs fixed (

1402869 - CVE-2016-9566 nagios: Privilege escalation issue
1405363 - CVE-2016-9565 nagios: Command injection via curl in MagpieRSS

6. Package List:

Red Hat Gluster Storage Nagios 3.1 on RHEL-7:



Red Hat Gluster Storage Server 3.1 on 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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