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https://issues.apache.org/jira/browse/CLOUDSTACK-9464?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John Burwell updated CLOUDSTACK-9464:
-------------------------------------
    Fix Version/s: 4.8.2.0
                   4.9.1.0
                   4.10.0.0

> VR vulnerable to DNS reflection attack
> --------------------------------------
>
>                 Key: CLOUDSTACK-9464
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-9464
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the 
> default.) 
>          Components: Virtual Router
>    Affects Versions: 4.8.0, 4.9.0
>         Environment: Advanced zones with Security Groups 
>            Reporter: Nux
>              Labels: ddos, dns, security, virtualrouter
>             Fix For: 4.10.0.0, 4.9.1.0, 4.8.2.0
>
>
> In advanced zones with Security Groups and probably Basic Zones, too, the VR 
> opens the DNS service to everyone (-j ACCEPT).
> As a result Cloudstack VRs are currently used in DNS reflection or 
> amplification attacks.
> There is some discussion about this in 
> https://issues.apache.org/jira/browse/CLOUDSTACK-6432
> This PR tries to rectify the problem:
> https://github.com/apache/cloudstack/pull/1653



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