CCE-47599-6Platform: cpe:/o:microsoft:windows_server_2016 | Date: (C)2022-09-02 (M)2023-07-04 |
MSS: (TcpMaxDataRetransmissions IPv6) How many times unacknowledged data is retransmitted (3 recommended, 5 is default)
Countermeasure:
Configure the MSS: (TcpMaxDataRetransmissions) IPv6 How many times unacknowledged data is retransmitted (3 recommended, 5 is default) entry to a value of 3. The possible values for this registry entry are:
? 0 to 0xFFFFFFFF. The default configuration is 5.
In the SCE UI, this setting can be adjusted using a text entry box:
? A user-defined number
? Not Defined
Potential Impact:
TCP starts a retransmission timer when each outbound segment is passed to the IP. If no acknowledgment is received for the data in a given segment before the timer expires, then the segment is retransmitted up to three times.
Fix:
(1) GPO: Computer ConfigurationAdministrative TemplatesMSS (Legacy)MSS: (TcpMaxDataRetransmissions IPv6) How many times unacknowledged data is retransmitted (3 recommended, 5 is default)
(2) REG: HKEY_LOCAL_MACHINESystemCurrentControlSetServicesTcpip6Parameters!TcpMaxDataRetransmissions
Parameter:
[Maximum retransmission]
Technical Mechanism:
(1) GPO: Computer Configuration\Administrative Templates\MSS (Legacy)\MSS: (TcpMaxDataRetransmissions IPv6) How many times unacknowledged data is retransmitted (3 recommended, 5 is default)
(2) REG: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip6\Parameters!TcpMaxDataRetransmissions
CCSS Severity: | CCSS Metrics: |
CCSS Score : 8.2 | Attack Vector: NETWORK |
Exploit Score: 3.9 | Attack Complexity: LOW |
Impact Score: 4.2 | Privileges Required: NONE |
Severity: HIGH | User Interaction: NONE |
Vector: AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H | Scope: UNCHANGED |
| Confidentiality: NONE |
| Integrity: LOW |
| Availability: HIGH |
| |
References: Resource Id | Reference |
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SCAP Repo OVAL Definition | oval:org.secpod.oval:def:83560 |