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Virtualization Security
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Table of Contents

Introduction xix Chapter 1 Fundamentals of Virtualization Security 1 Virtualization Architecture 1 Threats to a Virtualized Environment 4 Operational Threats 4 Malware-Based Threats 5 VM Escape 6 Vulnerabilities in Virtualization Platforms 9 How Security Must Adapt to Virtualization 9 Challenges for Securing Virtualized Environments 10 Challenges of Vulnerability Testing in a Virtualized Environment 10 Chapter 2 Securing Hypervisors 15 Hypervisor Configuration and Security 15 Configuring VMware ESXi 17 Patching VMware ESXi 17 Securing Communications in VMware ESXi 27 Change and Remove Default Settings on VMware ESXi 33 Enable Operational Security on VMware ESXi 34 Secure and Monitor Critical Configuration Files in VMware ESXi 38 Secure Local Users and Groups on VMware ESXi 40 Lock Down Access to Hypervisor Console 47 Configuring Microsoft Hyper-V on Windows Server 2008 52 Patching Hyper-V 53 Securing Communications with Hyper-V 53 Changing Hyper-V Default Settings 56 Enabling Operational Security for Hyper-V 59 Securing and Monitoring Critical Confi guration Files for Hyper-V 60 Secure Local Hyper-V Users and Groups 63 Lock Down Access to the Hyper-V Hypervisor Platform 68 Configuring Citrix XenServer 72 Patching XenServer 72 Secure Communications with XenServer 75 Change XenServer Default Settings 76 Enabling XenServer Operational Security 80 Secure and Monitor Critical XenServer Configuration Files 81 Secure Local Users and Groups 81 Lock Down Access to the XenServer Platform 88 Chapter 3 Designing Virtual Networks for Security 93 Comparing Virtual and Physical Networks 93 Virtual Network Design Elements 95 Physical vs Virtual Networks 98 Virtual Network Security Considerations 99 Important Security Elements 99 Architecture Considerations 100 Configuring Virtual Switches for Security 102 Defining Separate vSwitches and Port Groups 103 Configuring VLANs and Private VLANs for Network Segmentation 112 Limiting Virtual Network Ports in Use 117 Implementing Native Virtual Networking Security Policies 122 Securing iSCSI Storage Network Connections 125 Integrating with Physical Networking 129 Chapter 4 Advanced Virtual Network Operations 131 Network Operational Challenges 131 Network Operations in VMware vSphere 133 Load Balancing in vSphere Virtual Environments 133 Traffic Shaping and Network Performance in VMware vSphere 135 Creating a Sound Network Monitoring Strategy in VMware vSphere 136 Network Operations in Microsoft Hyper-V 141 Load Balancing in Hyper-V Virtual Environments 141 Traffic Shaping and Network Performance in Hyper-V 142 Creating a Sound Network Monitoring Strategy in Hyper-V 144 Network Operations in Citrix XenServer 145 Load Balancing in XenServer Virtual Environments 145 Traffic Shaping and Network Performance in XenServer 148 Creating a Sound Network Monitoring Strategy in XenServer 148 Chapter 5 Virtualization Management and Client Security 151 General Security Recommendations for Management Platforms 151 Network Architecture for Virtualization Management Servers 152 VMware vCenter 155 vCenter Service Account 157 Secure Communications in vCenter 158 vCenter Logging 160 Users, Groups, and Roles in vCenter 163 Role Creation Scenarios 167 vSphere Client 168 Microsoft System Center Virtual Machine Manager 168 SCVMM Service Account 169 Secure Communications with SCVMM 170 SCVMM Logging 171 Users, Groups, and Roles in SCVMM 172 Client Security 175 Citrix XenCenter 175 Secure Communication with XenCenter 175 Logging with XenCenter 176 Users, Groups, and Roles in XenCenter 176 Chapter 6 Securing the Virtual Machine 177 Virtual Machine Threats and Vulnerabilities 177 Virtual Machine Security Research 178 Stealing Guests 179 Cloud VM Reconnaissance 179 Virtual Disk Manipulation 180 Virtual Machine Encryption 180 Locking Down VMware VMs 185 VMware Tools 188 Copy/Paste Operations and HGFS 188 Virtual Machine Disk Security 189 VM Logging 189 Device Connectivity 190 Guest and Host Communications 191 Controlling API Access to VMs 192 Unexposed Features 193 Locking Down Microsoft VMs 195 Locking Down XenServer VMs 197 Chapter 7 Logging and Auditing 201 Why Logging and Auditing Is Critical 201 Virtualization Logs and Auditing Options 202 Syslog 203 Windows Event Log 204 VMware vSphere ESX Logging 205 VMware vSphere ESXi Logging 207 Microsoft Hyper-V and SCVMM Logging 211 Citrix XenServer and XenCenter Logging 218 Integrating with Existing Logging Platforms 221 Enabling Remote Logging on VMware vSphere 221 Enabling Remote Logging on Microsoft Hyper-V 223 Enabling Remote Logging for XenServer 225 Effective Log Management 226 Chapter 8 Change and Configuration Management 229 Change and Configuration Management Overview 229 Change Management for Security 230 The Change Ecosystem 231 How Virtualization Impacts Change and Configuration Management 234 Best Practices for Virtualization Configuration Management 235 Cloning and Templates for Improved Confi guration Management 237 Creating and Managing VMware vSphere VM Templates and Snapshots 238 Creating and Managing Microsoft Hyper-V VM Templates and Snapshots 242 Creating and Managing Citrix XenServer VM Templates and Snapshots 247 Integrating Virtualization into Change and Management 249 Additional Solutions and Tools 250 Chapter 9 Disaster Recovery and Business Continuity 253 Disaster Recovery and Business Continuity Today 253 Shared Storage and Replication 254 Virtualization Redundancy and Fault Tolerance for DR/BCP 256 Clustering 256 Resource Pools 262 High Availability and Fault Tolerance 270 Setting Up High Availability and Fault Tolerance in VMware vSphere 270 Setting Up High Availability and Fault Tolerance in Microsoft Hyper-V 274 Setting Up High Availability and Fault Tolerance in Citrix XenServer 277 Chapter 10 Scripting Tips and Tricks for Automation 281 Why Scripting Is Essential for Admins 281 VMware Scripting: Power CLI and vCLI 282 Scripting with PowerCLI 282 Configuring VMs with PowerCLI 283 Configuring VMs with vCLI 285 Configuring VMware ESXi with PowerCLI 286 Configuring VMware ESXi with the vCLI 289 Configuring VMware Virtual Networks with PowerCLI 290 Configuring VMware Virtual Networks with the vCLI 293 Configuring VMware vCenter with PowerCLI 294 Microsoft Scripting for Hyper-V: PowerShell 297 Getting Information about VMs 298 Getting Information about the Virtual Network 299 Assessing Other Aspects of the Virtual Environment 299 Citrix Scripting: Shell Scripts 300 Chapter 11 Additional Security Considerations for Virtual Infrastructure 303 VDI Overview 303 VDI Benefits and Drawbacks: Operations and Security 304 Security Advantages and Challenges 304 VDI Architecture Overview 307 Leveraging VDI for Security 310 Storage Virtualization 310 Application Virtualization 313 Index 317

About the Author

Dave Shackleford is founder and Principal Consultant with Voodoo Security, Senior Vice President of Research and CTO at IANS, and a SANS senior instructor and course author. He has consulted with hundreds of organizations in the areas of security, regulatory compliance, and network architecture and engineering. He is a VMware vExpert and has extensive experience designing and configuring secure virtualized infrastructures. Recently, Dave coauthored the first published course on virtualization security for the SANS Institute. He currently serves on the board of directors at the SANS Technology Institute and helps lead the Atlanta chapter of the Cloud Security Alliance.

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