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The SLES for vRealize must protect against or limit the effects of Denial of Service (DoS) attacks by ensuring the SLES for vRealize is implementing rate-limiting measures on impacted network interfaces.


Finding ID Version Rule ID IA Controls Severity
V-89811 VRAU-SL-001305 SV-100461r1_rule High
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 the operating system 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.
VMware vRealize Automation 7.x SLES Security Technical Implementation Guide 2018-10-12


Check Text ( C-89503r1_chk )
Check that the system configured to use TCP syncookies when experiencing a TCP SYN flood.

# cat /proc/sys/net/ipv4/tcp_syncookies

If the result is not "1", this is a finding.
Fix Text (F-96553r1_fix)
Configure the system to use TCP syncookies when experiencing a TCP SYN flood.

Check for the presence of "net.ipv4.tcp_syncookies" in the /etc/sysctl.conf file:

# grep "net.ipv4.tcp_syncookies" /etc/sysctl.conf

If it exists, change the value to "1". If it does not exist, add a setting for tcp_syncookies:

# echo "net.ipv4.tcp_syncookies=1" >> /etc/sysctl.conf

Reload sysctl to verify the new change:

# sysctl -p