Improving Web Application Security: Threats and - CGISecurity

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760 Improving Web Application Security: Threats and CountermeasuresAFD.SYS ProtectionsThe following keys specify parameters for the kernel mode driver Afd.sys. Afd.sys isused to support Windows sockets applications. All of the keys and values in thissection are located under the registry keyHKLM\System\CurrentControlSet\Services\AFD\Parameters. These keys andvalues are:● Value: EnableDynamicBacklogRecommended value data: 1Valid values: 0 (disabled), 1 (enabled)Description: Specifies AFD.SYS functionality to withstand large numbers ofSYN_RCVD connections efficiently. For more information, see “Internet ServerUnavailable Because of Malicious SYN Attacks,” athttp://support.microsoft.com/default.aspx?scid=kb;en-us;142641.●●●Value name: MinimumDynamicBacklogRecommended value data: 20Valid values: 0–4294967295Description: Specifies the minimum number of free connections allowed on alistening endpoint. If the number of free connections drops below this value, athread is queued to create additional free connectionsValue name: MaximumDynamicBacklogRecommended value data: 20000Valid values: 0–4294967295Description: Specifies the maximum total amount of both free connections plusthose in the SYN_RCVD state.Value name: DynamicBacklogGrowthDeltaRecommended value data: 10Valid values: 0–4294967295Present by default: NoDescription: Specifies the number of free connections to create when additionalconnections are necessary.
How To: Harden the TCP/IP Stack 761Use the values summarized in Table 4 for maximum protection.Table 4 Recommended ValuesValue NameValue (REG_DWORD)EnableDynamicBacklog 1MinimumDynamicBacklog 20MaximumDynamicBacklog 20000DynamicBacklogGrowthDelta 10Additional ProtectionsAll of the keys and values in this section are located under the registry keyHKLM\System\CurrentControlSet\Services\Tcpip\Parameters.Protect Screened Network DetailsNetwork Address Translation (NAT) is used to screen a network from incomingconnections. An attacker can circumvent this screen to determine the networktopology using IP source routing.Value: DisableIPSourceRoutingRecommended value data: 1Valid values: 0 (forward all packets), 1 (do not forward Source Routed packets),2 (drop all incoming source routed packets).Description: Disables IP source routing, which allows a sender to determine the routea datagram should take through the network.Avoid Accepting Fragmented PacketsProcessing fragmented packets can be expensive. Although it is rare for a denial ofservice to originate from within the perimeter network, this setting prevents theprocessing of fragmented packets.Value: EnableFragmentCheckingRecommended value data: 1Valid values: 0 (disabled), 1 (enabled)Description: Prevents the IP stack from accepting fragmented packets.
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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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Forewords xlvForeword by Joel Scamb
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Forewords xlviiFinally, techniques
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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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11Building Secure ServicedComponent
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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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Improving Web Application Security: Threats and - CGISecurity

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