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Re: Is my router owned? How would I know?
- From: Mikael Abrahamsson
- Date: Sat Jan 14 05:26:49 2006
On Sat, 14 Jan 2006, Alexei Roudnev wrote:
The major problem people forget is that snmp is UDP and if there is any
way what so ever to spoof your management station, someone will be able to
upload your config to whereever unless you have tightened down what can be
done via snmp write.
Some Cisco IOS'es have numerous bugs, related to SNMP (I watched few cases,
when all Cisco's 72xx lost configuration becuase of receivbing something
bogus), so SNMP should be filtered out from public internet.
As soon as they have your config they're likely to be able to progress
further unless you have very tight security.
Also remember that the private key for SSH is in the config so if they get
it, ssh offers no protection either.
Rule of thumb: All keys (tacacs keys, snmp communities etc) should be
unique for each device, so if someone gets the config, they cannot use the
information on other devices in your network.
Mikael Abrahamsson email: firstname.lastname@example.org