CCE-90903-6| Platform: cpe:/o:centos:centos:7, cpe:/o:redhat:enterprise_linux:7 | Date: (C)2017-06-29 (M)2023-07-04 |
To set the runtime status of the 'net.ipv4.tcp_syncookies' kernel parameter,
run the following command:
Parameter:
[yes/no]
Technical Mechanism:
A TCP SYN flood attack can cause a denial of service by filling
Asystem's TCP connection table with connections in the SYN_RCVD state.
Syncookies can be used to track a connection when a subsequent ACK is received,
verifying the initiator is attempting a valid connection and is not a flood
source. This feature is activated when a flood condition is detected, and
enables the system to continue servicing valid connection requests.
| 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:L/I:N/A:H | Scope: UNCHANGED |
| | Confidentiality: LOW |
| | Integrity: NONE |
| | Availability: HIGH |
| | |
References: | Resource Id | Reference |
|---|
| SCAP Repo OVAL Definition | oval:org.secpod.oval:def:30560 |
| SCAP Repo OVAL Definition | oval:org.secpod.oval:def:31283 |
