19 Mar

Prefix hijacks by D-Vois Broadband

Today BGPmon reported about possible BGP prefix hijack of Amazon’s IP address space. Amazon announces 50.16.0.0/16 from AS14618. At 13:45:44 UTC / 19:15:44 IST D-Vois broadband started originating a more specific 50.16.226.0/24 in the table from AS45769.

One of example AS_PATH of this announcement: 198290 197264 197264 197264 29467 1299 9583 45769

Clearly, this leak was carried over by AS9583 (Sify) to AS1299 (Telia) and was carried over to rest of internet from there. There was a visible withdrawal of this request by 14:17:37 UTC / 19:47:37 IST.  So it was visible for approx 32mins.

Hard to guess on how come they did that. May be they are learning more specific /24 from Amazon in India and they leaked e-BGP routes in their IGP or it was just a hijack for some hard to guess reasons.

BGP Play link for the reference: https://stat.ripe.net/widget/bgplay#w.resource=50.16.226.0/24

Right along with this, there are multiple more visible hijacks by D-Vois including of Cloudflare, AT&T, Microsoft etc.

 

For instant updates, one may follow – https://bgpstream.com/

 

 

***Updates***

So I looked at dumps from RIPE RIS collector rrc00 at 13:45UTC. This dump shows following prefixes announced by AS45769 updates.20170319.1345-prefixes

I used Team Cymru’s IP-ASN service to map these against actual origin ASNs and I get a list of all leaks:

 

I think it’s very hard to say now what actually caused the leak.

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