External access to Netgear RP114 "firewall"

[auto353237 () hushmail com]

The NetGear Web Safe Router RP114 with current firmware (3.26) is vulnerable in its default configuration.

The router acts as a DHCP server for LAN clients and as a DHCP client on the external side. The IP address 192.168.0.1 
is meant for local access, as DHCP server, DNS proxy, default gateway and administrative access with telnet and http.

Unfortunately the device answers on address 192.168.0.1 on the external side as well. This means that attackers in your 
neighbourhood can set their IP address to 192.168.0.x and they will have full access to your router with default 
username "admin" and default password "1234", using either telnet or http. They can configure the router's port 
forwarding to allow access to any computer on the inside that they wish to attack. If you can see your neighbours 
broadcast traffic such as ARP requests then they are close enough to attack you.

In certain locations your security is even worse with this "firewall" than without, because the port forwarding in the 
router can be configured to circumvent Netbios filters that your ISP may have in place to protect you. The easiest way 
to prevent this attack is to change the password from "1234".

It might be possible for a distant attacker to spoof his IP address as 192.168.0.x, sending a telnet session blind to 
remove all filters, or using source routing.

It is possible that other devices using the ZyNOS firmware from Zyxel has similar problems.

The manufacturer Netgear has been contacted but they just ignored it.

Max.


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