UCF STIG Viewer Logo

The SLES for vRealize must manage excess capacity, bandwidth, or other redundancy to limit the effects of information flooding types of Denial of Service (DoS) attacks.


Finding ID Version Rule ID IA Controls Severity
V-89715 VRAU-SL-000785 SV-100365r1_rule Medium
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.
VMware vRealize Automation 7.x SLES Security Technical Implementation Guide 2018-10-12


Check Text ( C-89407r1_chk )
Check that the SLES for vRealize 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-96457r2_fix)
Configure the SLES for vRealize to use TCP syncookies when experiencing a TCP SYN flood.

# sed -i 's/^.*\bnet.ipv4.tcp_syncookies\b.*$/net.ipv4.tcp_syncookies=1/' /etc/sysctl.conf

Reload sysctl to verify the new change:

# sysctl -p