AIX must set Stack Execution Disable (SED) system wide mode to all.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-91443	AIX7-00-003096	SV-101541r1_rule		Medium

Description
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. Managing excess capacity ensures that sufficient capacity is available to counter flooding attacks. Employing increased capacity and service redundancy may reduce the susceptibility to some DoS attacks. Managing excess capacity may include, for example, establishing selected usage priorities, quotas, or partitioning. Satisfies: SRG-OS-000142-GPOS-00071, SRG-OS-000480-GPOS-00227, SRG-OS-000433-GPOS-00192

Description

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. Managing excess capacity ensures that sufficient capacity is available to counter flooding attacks. Employing increased capacity and service redundancy may reduce the susceptibility to some DoS attacks. Managing excess capacity may include, for example, establishing selected usage priorities, quotas, or partitioning. Satisfies: SRG-OS-000142-GPOS-00071, SRG-OS-000480-GPOS-00227, SRG-OS-000433-GPOS-00192

STIG	Date
IBM AIX 7.x Security Technical Implementation Guide	2020-02-24

Details

Check Text ( C-90597r1_chk )
From the command prompt, run the following command to display SED systemwide mode: # sedmgr Stack Execution Disable (SED) mode: all SED configured in kernel: all If the above command shows a systemwide SED mode other than "all", this is a finding.

Fix Text (F-97641r1_fix)
From the command prompt, run the following command to set the SED systemwide mode to select: # sedmgr -m all AIX has to be rebooted for the new SED mode to take effect.