Improving Web Application Security: Threats and - CGISecurity

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762 Improving Web Application Security: Threats and CountermeasuresDo Not Forward Packets Destined for Multiple HostsMulticast packets may be responded to by multiple hosts, resulting in responses thatcan flood a network.Value: EnableMulticastForwardingRecommended value data: 0Valid range: 0 (false), 1 (true)Description: The routing service uses this parameter to control whether or not IPmulticasts are forwarded. This parameter is created by the Routing and RemoteAccess Service.Only Firewalls Forward Packets Between NetworksA multi-homed server must not forward packets between the networks it isconnected to. The obvious exception is the firewall.Value: IPEnableRouterRecommended value data: 0Valid range: 0 (false), 1 (true)Description: Setting this parameter to 1 (true) causes the system to route IP packetsbetween the networks to which it is connected.Mask Network Topology DetailsThe subnet mask of a host can be requested using ICMP packets. This disclosure ofinformation by itself is harmless; however, the responses of multiple hosts can beused to build knowledge of the internal network.Value: EnableAddrMaskReplyRecommended value data: 0Valid range: 0 (false), 1 (true)Description: This parameter controls whether the computer responds to an ICMPaddress mask request.
How To: Harden the TCP/IP Stack 763Use the values summarized in Table 5 for maximum protectionTable 5 Recommended ValuesValue NameValue (REG_DWORD)DisableIPSourceRouting 1EnableFragmentChecking 1EnableMulticastForwarding 0IPEnableRouter 0EnableAddrMaskReply 0PitfallsWhen testing the changes of these values, test against the network volumes youexpect in production. These settings modify the thresholds of what is considerednormal and are deviating from the tested defaults. Some may be too narrow tosupport clients reliably if the connection speed from clients varies greatly.Additional ResourcesFor additional reading about TCP/IP, refer to the following resources:● For more information on hardening the TCP/IP stack, see Microsoft KnowledgeBase article, 315669, “How To: Harden the TCP/IP Stack Against Denial of ServiceAttacks in Windows 2000.”● For more details on the Windows 2000 TCP/IP implementation, see the MicrosoftPress book, “Windows 2000 TCP/IP Protocols and Services,” by Lee Davies.● For more information about the Windows 2000 TCP/IP implementation,see “Microsoft Windows 2000 TCP/IP Implementation Details,”at http://www.microsoft.com/technet/treeview/default.asp?url=/technet/itsolutions/network/deploy/depovg/tcpip2k.asp, on the TechNet Web site.
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Contents xxvii.NET Remoting Securit
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Contents xxixStaying Secure (contin
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Contents xxxiASP.NET Architecture o
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Contents xxxiiiSummary ............
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Contents xxxvIndex of Checklists 68
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Contents xxxviiChecklistSecuring Da
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Contents xxxixHow ToIndex 743How To
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Contents xliRestricting Server-to-S
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ForewordsForeword by Mark CurpheyWh
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Fast Track — How To Implementthe
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Part IIntroduction to Threats andCo
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3Threat ModelingIn This Chapter●
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Chapter 3: Threat Modeling 47Threat
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Part IIDesigning SecureWeb Applicat
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Part IIIBuilding Secure WebApplicat
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8Code Access Security in PracticeIn
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Part IVSecuring Your Network,Host,
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18Securing Your Database ServerIn T
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21Code ReviewIn This Chapter●●
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22Deployment ReviewIn This Chapter
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patterns & practicesProven practice
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