An issue was discovered on Dasan GPON home routers. Command Injection can occur via the dest_host parameter in a diag_action=ping request to a GponForm/diag_Form URI. Because the router saves ping results in /tmp and transmits them to the user when the user revisits /diag.html, it's quite simple to execute commands and retrieve their output.

References

• https://nvd.nist.gov/vuln/detail/CVE-2018-10562
• https://www.exploit-db.com/exploits/44576/
• https://www.vpnmentor.com/blog/critical-vulnerability-gpon-router/
• http://www.securityfocus.com/bid/107053