Vulnerability identifier: #VU23882

Vulnerability risk: High

CVSSv3.1: 7.9 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-20197

CWE-ID: CWE-78

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Nagios XI
Server applications / Other server solutions

Vendor: nagios.org

Description

The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation. A remote authenticated attacker can execute arbitrary OS commands on the target system via shell metacharacters in the "id" parameter to "schedulereport.php".

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Nagios XI: 5.6.9

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External links
http://code610.blogspot.com/2019/12/postauth-rce-in-latest-nagiosxi.html

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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. However, proof of concept for this vulnerability is available.