[tor-relays] Strange BGP activity with my node

grarpamp grarpamp at gmail.com
Wed May 9 18:54:34 UTC 2018

On Wed, May 9, 2018 at 2:06 PM, Trevor Ellermann <trevor at ellermann.net> wrote:
> I just a notification from my data center that someone is trying to hijack
> the IP of my exit node. Seems like the sort of thing someone might do when
> trying to attack Tor. I'm in a very remote area with limited access but any
> suggestions on actions I should take?

Make sure your box and keys aren't compromised.
If that's ok, best they can do if the announcements are
listened to is camp on the ip for a while using their own keys,
(there might be some identification attacks made possible with
such a transient reroute,) circuits would fail till the consensus
updated to them, but there could be some duplicate ip split horizon
issues involved due to filtering.
If they hacked the boxes there's hardly need to expend noisy
reroutes when they can do most attacks using the box itself.

Hop on the route servers or your other favorite interfaces
to the net and analyze who all is announcing /32's trying to
cover any other tor nodes.

Sane isp's will filter such things without prior coordination. It's fairly rare,
and for them to bother giving customers courtesy reports. Though
depending on nature of ticket / relationship with GBLX, you might want
to reply saying you've never worked with Asavie and don't approve
of the action regarding your IP.

You can also search AS200005 to see what kind of heat
they catch from other operators / internet analysis tools.

> ====================================================================
> Possible Prefix Hijack (Code: 10)
> ====================================================================
> Your prefix:
> Prefix Description:   GBLX-US-BGP
> Update time:          2018-05-09 12:11 (UTC)
> Detected by #peers:   1
> Detected prefix:
> Announced by:         AS200005 (Asavie Technologies Limited)
> Upstream AS:          AS200005 (Asavie Technologies Limited)
> ASpath:               200005
> https://torstatus.blutmagie.de/router_detail.php?FP=383d6e34d9bea92e97092b134a708eef476df2e4

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