3 bad things here:

* You exposed your cluster to internet directly
* You did not disable dynamic scripting 
* May be you are running your elasticsearch node as root?

You should read that documentation: 
http://www.elasticsearch.org/guide/en/elasticsearch/reference/0.90/modules-scripting.html#_disabling_dynamic_scripts


-- 
David Pilato | Technical Advocate | Elasticsearch.com
@dadoonet | @elasticsearchfr


Le 9 juillet 2014 à 10:45:30, Umutcan (umut...@gamegos.com) a écrit:

Hi,  

We have been testing Elasticsearch for a while. Our ES cluster was on  
AWS. We installed Bigdesk, Marvel, Thrift, EC2 Discovery plugins. There  
were 5 instance (1 load balancer, 4 data node) and all of them were  
version 0.90.  

Yesterday, We have received an e-mail from AWS. They said one of our  
instance in ES cluster was making DOS attacks from UDP port 80.  

We did not restrict ports, because it was an test cluster. It can be  
main cause of this problem, but I still want to ask if there is a known  
bug (in ES or modules or plugins) that cause something like this or if  
there is anyone who have seen some kind of similar problem.  

Thanks,  
Umutcan Onal  

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