usg40's - vpn tunnel not working - no change in config in 12 months
Accepted Solution
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@zigandzag, this seems like a compromise on zyxel routers, please remove unknown user accounts and ssl vpn settings and change all password and remove the routes pointing to any and disable HTTPS access. This has happened to a couple of our customers routers. Zyxel needs to patch this ASAP!
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All Replies
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@zigandzag, this seems like a compromise on zyxel routers, please remove unknown user accounts and ssl vpn settings and change all password and remove the routes pointing to any and disable HTTPS access. This has happened to a couple of our customers routers. Zyxel needs to patch this ASAP!
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Turn off the https service on WAN or limit the accessible IP addresses0
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We’re aware of the situation and have been working our best to investigate and resolve it.
In the interim, here’s a list of currently known to be the most effective ways to mitigate the impact:”
Scenario#1
If you allow traffic from Internet to your device with WebGUI and SSL VPN tunnel, you can follow these steps to protect your device.
1. Add IP address object(s) to trusted addresses or trusted countries.
(Configuration > Object > Address/GeoIP)
2. Allow trusted IP addresses and Deny others traffic from Internet
(Configuration > Security Policy > Policy Control)
#1. You can allow trusted IP addresses and WebGUI/SSL service ports from WAN side for access.
#2. Deny other IP addresses that you do not trust to access your WebGUI.
3. Change HTTPS connection port from the default 443 to another port (without conflicting with other services) and make sure that this port is added in policy control rule #1.
(Configuration > System > WWW)
Change HTTPS connection port. e.g 17443
After changing HTTPS Service port, you must reconnect to your device using the new port. If you would like to use SSL VPN tunnel to access your device, make sure that the public IP address of your PC is added in your Trusted IP List. While connecting to your device, make sure to enter the correct port in SecuExtender.
Scenario#2If there is no WebGUI/SSL VPN tunnel required, you can move the default rule (WAN_to_Device) as the first rule and keep the last rule as “deny”.
(Allowed services are for IPSec VPN/VRRP/GRE)
Make sure there is no HTTP/HTTPS WebGUI service port in service group.
We also suggest to change the admin password.
In addition, you can refer to our latest document “Best Practice to Secure a Distributed Network Infrastructure” to design and secure your network.
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