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If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important.  If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.

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Vulnerability Assessment Details


Vulnerability Assessment Summary
Uses SNMP to determine if a flaw is present

Detailed Explanation for this Vulnerability Assessment

It is possible to send an Address Resolution Protocol (ARP) packet on
a local broadcast interface (for example, Ethernet, cable, Token
Ring, FDDI) which could cause a router or switch running specific
versions of Cisco IOSŪ Software Release to stop sending and receiving
ARP packets on the local router interface. This will in a short time
cause the router and local hosts to be unable to send packets to each
other. ARP packets received by the router for the router's own
interface address but a different Media Access Control (MAC) address
will overwrite the router's MAC address in the ARP table with the one
from the received ARP packet. This was demonstrated to attendees of
the Black Hat conference and should be considered to be public
knowledge. This attack is only successful against devices on the
segment local to the attacker or attacking host.
This vulnerability is documented in Cisco Bug ID CSCdu81936.

A local attacker may use this flaw to prevent your network from
working properly.

Solution :
Network Security Threat Level: High

*** As Nessus solely relied on the banner of the remote host
*** this might be a false positive

Networks Security ID: 3547

Vulnerability Assessment Copyright: This script is (C) 2002 Renaud Deraison

Cables, Connectors


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