Security risk associated with a NIC's promiscuous mode?
cswiger at mac.com
Fri Oct 7 06:45:53 PDT 2005
John Conover wrote:
> Is there any security risk associated with a NIC's promiscuous mode
> while running tcpdump and/or arpwatch?
A mild one. For example, I believe there was recently a security bug in
tcpdump's string handling which could be exploited by tcpdump seeing a
maliciously-crafted packet. Running the NIC in promisc mode means that packet
just has to go by, rather than being sent specificly to the machine running the
In other words, it's not a great idea to run a sniffer on your most important
fileserver or whatever, rather than an isolated laptop or other test system.
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