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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CLOUDSTACK-6432) Prevent VR from response to DNS request from outside of network
Date Fri, 26 Aug 2016 10:37:20 GMT

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-6432?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15438778#comment-15438778
] 

ASF GitHub Bot commented on CLOUDSTACK-6432:
--------------------------------------------

GitHub user rhtyd opened a pull request:

    https://github.com/apache/cloudstack/pull/1663

    CLOUDSTACK-6432: Prevent DNS reflection attacks

    At least in SG zones DNS on the VR is publicly accessible and as such
    susceptible to DNS amplification/reflection attacks. This fixes it as per
    https://issues.apache.org/jira/browse/CLOUDSTACK-6432 to only allow IPs
    from the guest cidr to send DNS requests on port 53.
    
    Due to repository commit issues I've created this PR, based on #1653 .

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/shapeblue/cloudstack 4.9-dnsreflection-attack

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/cloudstack/pull/1663.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #1663
    
----
commit 5adacc9b6f1b7b9ae53d35aa78fc8f7cd0d2273e
Author: NuxRo <nux@li.nux.ro>
Date:   2016-08-22T09:31:41Z

    CLOUDSTACK-6432: Prevent DNS reflection attacks
    
    At least in SG zones DNS on the VR is publicly accessible and as such
    susceptible to DNS amplification/reflection attacks. This fixes it as per
    https://issues.apache.org/jira/browse/CLOUDSTACK-6432 to only allow IPs
    from the guest cidr to send DNS requests on port 53.
    
    Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>

----


> Prevent VR from response to DNS request from outside of network
> ---------------------------------------------------------------
>
>                 Key: CLOUDSTACK-6432
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-6432
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>    Affects Versions: 4.4.0, 4.5.0
>            Reporter: Sheng Yang
>            Assignee: Sheng Yang
>             Fix For: 4.4.0, 4.5.0
>
>
> In basic and shared network, VR use private network nic for dhcp/dns services. But if
private network is on the internet as well, it would make VR facing outside network.
> We would restrain the VR DNS service inside CloudStack managed network.



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