Finding ID | Version | Rule ID | IA Controls | Severity |
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V-38539 | RHEL-06-000095 | SV-50340r2_rule | Medium |
Description |
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A TCP SYN flood attack can cause a denial of service by filling a system'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. |
STIG | Date |
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Red Hat Enterprise Linux 6 Security Technical Implementation Guide | 2017-04-28 |
Check Text ( None ) |
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None |
Fix Text (F-43487r1_fix) |
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To set the runtime status of the "net.ipv4.tcp_syncookies" kernel parameter, run the following command: # sysctl -w net.ipv4.tcp_syncookies=1 If this is not the system's default value, add the following line to "/etc/sysctl.conf": net.ipv4.tcp_syncookies = 1 |