Vulnerability identifier: #VU12661

Vulnerability risk: High

CVSSv3.1: 9.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2018-10562

CWE-ID: CWE-77

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
GPON
Hardware solutions / Routers for home users

Vendor: Dasan Networks

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

The weakness exists due to command injection via the dest_host parameter in a diag_action=ping request to a GponForm/diag_Form URI. A remote attacker can inject arbitrary commands and execute arbitrary code because the router saves ping results in /tmp and transmits them to the user when the user revisits /diag.html.

Mitigation
Install update from vendor's website.

Vulnerable software versions

GPON: All versions

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External links
http://www.vpnmentor.com/blog/critical-vulnerability-gpon-router/

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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.