Vulnerability identifier: #VU24734

Vulnerability risk: High

CVSSv3.1: 8.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-20217

CWE-ID: CWE-78

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
DIR-859
Hardware solutions / Routers for home users

Vendor: D-Link

Description

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

The vulnerability exists due to the SERVER_ID is mishandled in the "ssdpcgi()" function in "/htdocs/cgibin". A remote unauthenticated attacker can execute arbitrary OS commands on the target system via the urn: to the M-SEARCH method.

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

Mitigation
Install updates from vendor's website.

Vulnerable software versions

DIR-859: 1.05 - 1.06b01Beta01

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External links
http://medium.com/@s1kr10s/d-link-dir-859-rce-unauthenticated-cve-2019-20216-cve-2019-20217-en-6bca043500ae
http://medium.com/@s1kr10s/d-link-dir-859-rce-unauthenticated-cve-2019-20216-cve-2019-20217-es-e11ca6168d35
http://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10147

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker 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.