BGPMon On Illegitimate Route Announcement

In November I posted BGPMon on BGP Table Leak by Companhia de Telecomunicacoes do Brasil Central. A lot of people saw that activity but the overall effect was negligible to nonexistent.

Yesterday I received a more personalized alert from BGPMon:

You Receive this email because you are subscribed to BGPmon.net.
For more details about these updates please visit:
http://bgpmon.net/showupdates.php

====================
WithDraw of More Specific (Code: 23)
2 number of peer(s) detected this updates for your prefix 3.0.0.0/8:
Update details: 2009-01-01 08:33 (UTC)
3.3.3.3/32
====================
Possible Prefix Hijack (Code: 11)
2 number of peer(s) detected this updates for your prefix 3.0.0.0/8:
Update details: 2009-01-01 08:31 (UTC)
3.3.3.3/32
Announced by: AS15475 (NOL)
Transit AS: 8452 (TEDATA TEDATA)
ASpath: 29073 9009 19151 4788 8452 15475

Checking WHOIS data for AS15475 shows:

% Information related to 'AS15475'

aut-num:        AS15475
as-name:        NOL
descr:          Nile Online
descr:          Giza,Egypt
descr:          For any abuse complain contact abuse@nile-online.com

So, an ISP in Giza, Egypt announced a 3.3.3.3/32 route to the Internet. That looks like some kind of test. I used to be amazed to see a /32 route appear like this in global BGP tables, but now that I know most ISPs don't filter anything I am not so surprised anymore. Previously I would have thought one of the AS in the AS path would have filtered this.

Richard Bejtlich is teaching new classes in DC and Europe in 2009. Register by 1 Jan and 1 Feb, respectively, for the best rates.

Comments

Matt said…
Forgive me if I'm misunderstanding the recent "vulnerability", but could the ability to create a "genuine" certificate be coupled with this particularly fun aspect of BGP to create a man in the middle attack? I seem remember something similar being posited back when this flaw came to light (again?) a few months ago, and at that point, the sticking point was that the attacker couldn't replicate the certificate, so banks and other people with "good" certificates were safe.
10:03 AM
Anonymous said…
FWIW, most clueful ISPs do filter ANYTHING longer than a /24, from both customers and peers, and that's why only a very small number of networks (e.g., only rrc11 and rrc12 RIPE route servers) reported this /32 announcement. I too am surprised that this route announcement made it across 5 different ISPs. It is nice that you were alerted on this event, even while the duration was less than 3 minutes.
12:32 PM
Anonymous said…
At least one other person was notified because of a more specific (/26 in this case) that was announced by AS15475 (NOL).

It seems they the leaked a bunch of more specifics including a number of Bogons, Such as 100.100.100.0/30 and 2.2.2.2/32
This was all just for a few minutes.
3:49 PM
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