#VU48930 Improper Neutralization of Special Elements in Output Used by a Downstream Component in nrpe - CVE-2020-6581

Vulnerability identifier: #VU48930

Vulnerability risk: High

CVSSv4.0: 5.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-6581

CWE-ID: CWE-74

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
nrpe
Other software / Other software solutions

Vendor: www.nagios.org

Description

The vulnerability allows a remote authenticated user to execute arbitrary code.

Nagios NRPE 3.2.1 has Insufficient Filtering because, for example, nasty_metachars interprets as the character and the character n (not as the newline sequence). This can cause command injection.

Mitigation
Install update from vendor's website.

Vulnerable software versions

nrpe: 3.2.1

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External links
https://herolab.usd.de/security-advisories/
https://herolab.usd.de/security-advisories/usd-2020-0002/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2DNGKXVDB43E3KQRA6W5QZT3Z46XZLQM/

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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.