OS Command Injection in Zyxel P660HN-T1A

1) OS Command Injection

EUVDB-ID: #VU58146

Risk: High

CVSSv3.1: 9.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:U/RC:C]

CVE-ID: CVE-2017-18368

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Exploit availability: No

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 "remote_host" parameter in Remote System Log forwarding function. A remote unauthenticated attacker can pass specially crafted data to the application and execute arbitrary OS commands on the target system.

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

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

P660HN-T1A: before 3.40(BYF.11)

CPE2.3

• cpe:2.3:h:zyxel_communications_corp:p660hn-t1a:*:*:*:*:*:*:*:

External links

http://www.zyxel.com/support/announcement_unauthenticated.shtml
http://raw.githubusercontent.com/pedrib/PoC/master/advisories/zyxel_trueonline.txt
http://seclists.org/fulldisclosure/2017/Jan/40
http://ssd-disclosure.com/index.php/archives/2910
http://unit42.paloaltonetworks.com/new-mirai-variant-targets-enterprise-wireless-presentation-display-systems/

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.