NETWORK SECURITY in .NET framework

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The public clouds all provide a firewall; ideally (but not true in all public clouds), the inbound firewall is configured in a default deny mode for safety, and the user must explicitly open any ports to allow inbound traffic. Like any good firewall, the traffic may be restricted by protocol, by service port, as well as by source IP address (individual IP or Classless Inter-Domain Routing [CIDR] block).
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Paravirtualization s role in security
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Most public clouds (such as Amazon s EC2) are based on a type of virtualization called paravirtualization. In paravirtualization, a software interface to virtual machines similar but not identical to that of the underlying hardware is presented. The intent is to reduce the portion of the guest s execution time spent performing operations that are substantially more difficult to run in a virtual environment compared to a nonvirtualized environment. A paravirtualized platform allows the virtual machine monitor (VMM) to be simpler (by relocating execution of critical tasks from the virtual domain to the host domain), and/or reduces the overall performance degradation of machine-execution inside the virtual guest. More important, for this security discussion, the guest OS has no elevated access to the CPU. This leads to a clear separation between guest and hypervisor, which, in theory, provides strong security.
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Control of and changes to the firewall aren t controlled by the host/instance itself, but require the customer s X.509 certificate and key to authorize changes, thus adding an extra layer of security. Within EC2, the host administrator and cloud administrator can be separate people, permitting two-man-rule security policies to be enforced. In addition, AWS encourages customers to apply additional per-instance filters with hostbased firewalls such as IPtables. This can restrict both inbound and outbound traffic on each instance. The level of security afforded by the firewall is a function of which ports are opened by you, and for what duration and purpose. The default state is to deny all incoming traffic, and developers should plan carefully what they ll open when building and securing their applications. It still requires well-informed traffic management and security design on a per-instance basis. The fact that the prominent public cloud providers were first and foremost major internet destination sites has enormous benefits. Their e-commerce operations were and are subject to incoming attacks, such as Distributed Denial of Service (DDoS) attacks. Their prowess in preventing such attacks bleeds over to their public clouds. To wit, public cloud control API endpoints are hosted on the same internet-scale, worldclass infrastructure that supports the public cloud provider s other business sites. They use standard DDoS mitigation techniques, such as SYN cookies and connection limiting. To further mitigate the effect of potential DDoS attacks, providers maintain internal bandwidth that exceeds their provider-supplied internet bandwidth. This prevents bandwidth saturation from an external attack agent. Amazon EC2 instances aren t permitted to send spoofed traffic (including to another Amazon customer). The Amazon-controlled, host-based firewall infrastructure won t permit an instance to send traffic with a source IP or MAC address other than its own.
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It isn t possible for a virtual instance running in promiscuous mode to receive or sniff traffic intended for a different virtual instance anywhere in Amazon s cloud. Although customers can place their interfaces into promiscuous mode, the hypervisor won t deliver any traffic to them not addressed to them. This includes two virtual instances owned by the same customer, even if they re located on the same physical host. Attacks such as ARP cache poisoning don t work in EC2. Although Amazon EC2 provides ample protection against one customer inadvertently or maliciously attempting to view another s data, as a standard practice customers should encrypt sensitive traffic. Cloud providers are already providing stored data verification. They do this efficiently by performing an MD5 hash on all stored data objects. Your machine instances have no access to raw disk devices but instead are presented with virtualized disks. The cloud provider s disk virtualization layer automatically wipes every block of storage you use and guarantees that your data is never exposed to another. Vigilance is still important, and best practice is to also run an encrypted file system on top of the virtualized disk device.
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