Finding ID | Version | Rule ID | IA Controls | Severity |
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V-4438 | WN12-SO-000048 | SV-52929r2_rule | Low |
Description |
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In a SYN flood attack, the attacker sends a continuous stream of SYN packets to a server, and the server leaves the half-open connections open until it is overwhelmed and is no longer able to respond to legitimate requests. |
STIG | Date |
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Windows Server 2012/2012 R2 Member Server Security Technical Implementation Guide | 2018-10-30 |
Check Text ( C-47234r3_chk ) |
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If the following registry value does not exist or is not configured as specified, this is a finding: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\ Value Name: TcpMaxDataRetransmissions Value Type: REG_DWORD Value: 3 (or less) |
Fix Text (F-45855r3_fix) |
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Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "MSS: (TcpMaxDataRetransmissions) How many times unacknowledged data is retransmitted (3 recommended, 5 is default)" to "3" or less. (See "Updating the Windows Security Options File" in the STIG Overview document if MSS settings are not visible in the system's policy tools.) |