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Date: Thu, 15 Dec 2016 07:24:27 -0200
From: Dawid Golunski <>
Subject: [FD] Nagios Core < 4.2.4 Root Privilege Escalation [CVE-2016-9566]

Nagios Core < 4.2.4  Root Privilege Escalation

Discovered by: Dawid Golunski (@dawid_golunski)

Severity: High

Nagios Core daemon in versions below 4.2.4 was found to perform unsafe
operations when handling the log file. This could be exploited by
malicious local attackers to escalate their privileges from 'nagios'
system user,
or from a user belonging to 'nagios' group, to root.
The exploit could enable the attackers to fully compromise the system on which a
vulnerable Nagios version was installed.

To obtain the necessary level of access (nagios user/group), the
attackers could potentially use another Nagios vulnerability -

The full advisory and a PoC exploit for CVE-2016-9566 can be found at:

The CVE-2016-9565 vulnerability can be found at:

For updates, follow:

Dawid Golunski
t: @dawid_golunski

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