TCP backlog queue sizes must be set appropriately.

From SOLARIS 10 X86 SECURITY TECHNICAL IMPLEMENTATION GUIDE

Associated with: CCI-000366

SV-28639r2_rule TCP backlog queue sizes must be set appropriately.

Vulnerability discussion

To provide some mitigation to TCP DoS attacks, the TCP backlog queue sizes must be set to at least 1280 or in accordance with product-specific guidelines.

Check content

Determine the type of zone that you are currently securing. # zonename If the zone is not the global zone, determine if any interfaces are exclusive to the zone: # dladm show-link If the output indicates "insufficient privileges" then this requirement is not applicable. If the zone is the global zone or the non-global zone has exclusive interfaces determine the network settings. Procedure: # ndd /dev/tcp tcp_conn_req_max_q0 If the returned value is not 1280 or greater, this is a finding. Procedure: # ndd /dev/tcp tcp_conn_req_max_q If the returned value is not 1024, this is a finding.

Fix text

Procedure: # ndd -set /dev/tcp tcp_conn_req_max_q0 1280 # ndd -set /dev/tcp tcp_conn_req_max_q 1024 Ensure these commands are also present in system startup scripts.

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