Vulnerability identifier: #VU53531

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-28911

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Nagios Fusion
Server applications / SCADA systems

Vendor: nagios.org

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions in the "test_server" command in ajaxhelper.php. A remote authenticated attacker can bypass implemented security restrictions and gain unauthorized access to sensitive information on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Nagios Fusion: 4.0.0 - 4.1.8

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External links
http://skylightcyber.com/2021/05/20/13-nagios-vulnerabilities-7-will-shock-you/
http://www.nagios.com/downloads/nagios-xi/change-log/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.