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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 resolved CLOUDSTACK-9464.
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Resolution: Fixed
Assignee: Rohit Yadav
The fix for this bug has been merged into the 4.8, 4.9, and master branches.
> 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
> Assignee: Rohit Yadav
> 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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