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https://issues.apache.org/jira/browse/CLOUDSTACK-6432?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15445215#comment-15445215
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ASF GitHub Bot commented on CLOUDSTACK-6432:
--------------------------------------------
GitHub user rhtyd reopened a pull request:
https://github.com/apache/cloudstack/pull/1663
[LTS/blocker] CLOUDSTACK-6432: Prevent DNS reflection attacks
CLOUDSTACK-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:
https://issues.apache.org/jira/browse/CLOUDSTACK-6432
- 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
tests.
Due to repository commit issues I've created this PR, based on #1653 .
/cc @jburwell @karuturi @NuxRo @ustcweizhou @wido and others
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 56ad2c83ae2fb8f3cb74df15ed57a35c795ebced
Author: Rohit Yadav <[email protected]>
Date: 2016-08-22T09:31:41Z
CLOUDSTACK-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:
https://issues.apache.org/jira/browse/CLOUDSTACK-6432
- 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
tests.
Signed-off-by: Rohit Yadav <[email protected]>
----
> 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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