Yesterday I noticed some suspicous activity when running
netstat | grep http on my Azure Ubuntu VM:
There were over 60 lines like this:
tcp 0 0 ser:http hosted-by.blazing:29248 SYN_RECV tcp 0 0 ser:http hosted-by.blazingf:59438 SYN_RECV tcp 0 0 ser:http 126.96.36.199:7057 SYN_RECV # [SNIP]
I am guessing this is a SYN flood attack, and given the presense of
188.8.131.52 possibly some IP Spoofing? I don’t have any DDOS protection from Azure, just a standard Ubuntu VM. I tried a few things:
Uncommented the line
/etc/sysctl.conf and ran
sysctl -p but the above packets continued.
I already have my own iptables script in place, to lock the server down a bit. Whilst checking over this script, I noticed some unrelated lines in
INFO Exception processing GoalState-related files: [ProtocolError] [Wireserver Exception] [HttpError] [HTTP Failed] GET http://184.108.40.206/machine/?comp=goalstate -- IOError timed out -- 6 attempts made
Some investigation into this IP, shows that it’s part of Azure’s infastructure, so I went ahead and added this to my firewall script, to allow outgoing traffic to this IP on port 80.
Suddenly the earlier SYN traffic stopped.
Is this just chance, or would allowing traffic out to
220.127.116.11 somehow start providing some protection against this attack, even without any DDOS protection enabled through Azure portal?
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