Vulnerability identifier: #VU24736

Vulnerability risk: High

CVSSv3.1: 9.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2019-17621

CWE-ID: CWE-78

Exploitation vector: Network

Exploit availability: Yes

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 improper input validation in the UPnP endpoint URL in /gena.cgi. A remote unauthenticated attacker can send a specially crafted HTTP SUBSCRIBE request to the UPnP service when connecting to the local network and execute arbitrary OS commands on the target system.

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://packetstormsecurity.com/files/156054/D-Link-DIR-859-Unauthenticated-Remote-Command-Execution.html
http://medium.com/@s1kr10s/d-link-dir-859-rce-unautenticated-cve-2019-17621-en-d94b47a15104
http://medium.com/@s1kr10s/d-link-dir-859-rce-unautenticated-cve-2019-17621-es-fad716629ff9
http://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10146
http://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10147
http://www.dlink.com/en/security-bulletin
http://www.ftc.gov/system/files/documents/cases/dlink_proposed_order_and_judgment_7-2-19.pdf

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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?

Yes. This vulnerability is being exploited in the wild.