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Date: Mon, 15 Jun 2015 11:21:00 +0000 (UTC)
From: "Wido den Hollander (JIRA)" <jira@apache.org>
To: cloudstack-issues@incubator.apache.org
Message-ID: <JIRA.12837806.1434367225000.71095.1434367260829@Atlassian.JIRA>
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 <JIRA.12837806.1434367225198@arcas>
Subject: [jira] [Created] (CLOUDSTACK-8559) Source address spoofing
 prevention in Basic Networking only done for DNS
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Wido den Hollander created CLOUDSTACK-8559:
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             Summary: Source address spoofing prevention in Basic Networking only done for DNS
                 Key: CLOUDSTACK-8559
                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-8559
             Project: CloudStack
          Issue Type: Bug
      Security Level: Public (Anyone can view this level - this is the default.)
          Components: KVM
            Reporter: Wido den Hollander
            Assignee: Wido den Hollander


Looking at the security group rules being programmed for Instances it seems that we only drop spoofed traffic when it's for DNS:


if vm_ip is not None:
  execute("iptables -A " + vmchain_default + " -m physdev --physdev-is-bridged --physdev-in " + vif + " -m set --set " + vmipsetName + " src -p udp --dport 53  -j RETURN ")
  execute("iptables -A " + vmchain_default + " -m physdev --physdev-is-bridged --physdev-in " + vif + " -m set --set " + vmipsetName + " src -j " + vmchain_egress)

I think that we can drop ALL packets which do not match any of the IPs in the list. I don't see a valid reason why we only do this for DNS/UDP 53.


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