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The system must limit how many times unacknowledged TCP data is retransmitted.


Overview

Finding ID Version Rule ID IA Controls Severity
V-4438 5.098 SV-32359r2_rule ECSC-1 Low
Description
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 no longer able to respond to legitimate requests.
STIG Date
Windows Server 2008 R2 Member Server Security Technical Implementation Guide 2016-01-22

Details

Check Text ( None )
None
Fix Text (F-66935r1_fix)
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.