V-215399

Discussion

DoS is a condition when a resource is not available for legitimate users. When this occurs, the organization either cannot accomplish its mission or must operate at degraded capacity. This requirement addresses the configuration of AIX to mitigate the impact of DoS attacks that have occurred or are ongoing on system availability. For each system, known and potential DoS attacks must be identified and solutions for each type implemented. A variety of technologies exist to limit or, in some cases, eliminate the effects of DoS attacks (e.g., limiting processes or establishing memory partitions). Employing increased capacity and bandwidth, combined with service redundancy, may reduce the susceptibility to some DoS attacks.

Check Content

Check to see if bos.net.tcp.client_core package is installed:

# lslpp -l | grep bos.net.tcp.client_core
bos.net.tcp.client_core    7.2.1.1  COMMITTED  TCP/IP Client Core Support
bos.net.tcp.client_core    7.2.1.1  COMMITTED  TCP/IP Client Core Support

If the packages are not "COMMITTED", this is a finding.

Check that the value set for "clean_partial_conns" is "1":

# /usr/sbin/no -o clean_partial_conns 
clean_partial_conns = 1

If the value returned is "0", this is a finding.