Vulnerability identifier: #VU53521

Vulnerability risk: Medium

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-28906

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Nagios XI
Server applications / Other server solutions
Nagios Fusion
Server applications / SCADA systems

Vendor: nagios.org

Description

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to incorrect file permissions in fusion-sys.cfg / xi-sys.cfg. A remote authenticated attacker can modify files that are included by scripts and gain elevated privileges on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Nagios XI: 5.7.0 - 5.7.5

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.