#VU24732 OS Command Injection in DIR-859 - CVE-2019-20215

Vulnerability identifier: #VU24732

Vulnerability risk: High

CVSSv4.0: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber]

CVE-ID: CVE-2019-20215

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 the HTTP_ST is mishandled in the "ssdpcgi()" function in "/htdocs/cgibin". A remote unauthenticated attacker can execute arbitrary OS commands on the target system via a 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
https://medium.com/@s1kr10s/d-link-dir-859-unauthenticated-rce-in-ssdpcgi-http-st-cve-2019-20215-en-2e799acb8a73
https://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, a fully functional exploit for this vulnerability is available.