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From "ASF subversion and git services (JIRA)" <>
Subject [jira] [Commented] (CLOUDSTACK-6432) Prevent VR from response to DNS request from outside of network
Date Tue, 30 Aug 2016 17:15:21 GMT


ASF subversion and git services commented on CLOUDSTACK-6432:

Commit 3e6f49d9e28007d8c4a0b51b34e32e7f6d724c1e in cloudstack's branch refs/heads/master from
[;h=3e6f49d ]

Merge pull request #1663 from shapeblue/4.9-dnsreflection-attack

[LTS/blocker] CLOUDSTACK-6432: Prevent DNS reflection attacksCLOUDSTACK-6432: Prevent DNS
reflection attacks

    DNS on VR should not be publically accessible as it may be prone to DNS
    amplification/reflection attacks. This fixes the issue by only allowing VR
    DNS (port 53) to be accessible from guest network cidr, as per the fix in:

    - Only allows guest network cidrs to query VR DNS on port 53.
    - Includes marvin smoke test that checks the VR DNS accessibility checks from
      guest and non-guest network.
    - Fixes Marvin sshClient to avoid using ssh agent when password is provided,
      previous some environments may have seen 'No existing session' exception without
      this fix.
    - Adds a new dnspython dependency that is used to perform dns resolutions in the

Due to repository commit issues I've created this PR, based on #1653 .

/cc @jburwell @karuturi @NuxRo @ustcweizhou @wido  and others

* pr/1663:
  CLOUDSTACK-6432: Prevent DNS reflection attacks

Signed-off-by: Rohit Yadav <>

> Prevent VR from response to DNS request from outside of network
> ---------------------------------------------------------------
>                 Key: CLOUDSTACK-6432
>                 URL:
>             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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