IP-source routing is enabled for the router
|cisco-ipsource-routing-enabled (8408)||Medium Risk|
Cisco routers normally accept and process source routes. Unless a network depends on it, source routing should be disabled.
Source routing is a technique whereby the sender of a packet can specify the route that a packet should take through the network. As a packet travels through the network, each router will examine the destination IP address and choose the next hop to forward the packet to. In source routing, the "source" (i.e., the sender) makes some or all of these decisions. Attackers can use source routing to probe the network by forcing packets into specific parts of the network. Using source routing, an attacker can collect information about a network?s topology, or other information that could be useful in performing an attack. During an attack, an attacker could use source routing to direct packets to bypass existing security restrictions.
Use the 'no ip source-route' command to disable IP source routing on the router. Refer to your router documentation for specific instructions.
- NSA Router Security Configuration Guide: IP Source Routing (page 65).
- Cisco IOS
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