28 Mar
2018
28 Mar
'18
6:02 p.m.
Hello,
I recommend disabling the access to unneeded management services and to
the remaining ones, restricting the access to them from the networks
used by the administrators.
Something like this at the command line (also available in Winbox/Webfig
in the IP->Services menu):
/ip service
set telnet disabled=yes
set ftp disabled=yes
set www address=44.158.0.0/24,192.168.0.0/24 # Change this address
blocks to fit your networks
set ssh address=44.158.0.0/24,192.168.0.0/24 # Change this address
blocks to fit your networks
set api disabled=yes
set winbox disabled=yes
set api-ssl disabled=yes
regards!
73!
On 2018/03/28 21:46, Rob Janssen wrote:
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QRA: Pedro Ribeiro
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NET: http://www.qrz.com/db/CT7ABP
CT7ABP is also home station of CR7AJI Diogo
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it is not wise
to block port 8291, because the exploitable service is
on http port 80 tcp.
The worm uses port 8291 to identify possible victims (when it can
connect to port 8291 it assumes
there is a MikroTik router on that address), then attacks it on port
80 and some other ports that
people may likely have set as an alternative for HTTP access to the
router (8080 etc).
So blocking port 8291 effectively blocks the worm in its current
version, while not destroying the
useful port 80. Of course experience with earlier events like this
shows that such a worm typically
evolves and may skip the port 8291 scan later, rendering this block
ineffective.
For now, I have blocked access to port 8291 from addresses outside
AMPRnet on our gateway.
Of course this restriction will be lifted when/if this worm stops
operation.
It appears to be controlled via a peer-to-peer network and it looks
like it is a version of an
existing worm that has been active on network cameras/recorders,
routers from other manufacturers,
etc, all running embedded Linux.
Rob
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