← Back to VMware vRealize Operations Manager 6.x SLES Security Technical Implementation Guide

V-239562

CAT II (Medium)

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.

Rule ID

SV-239562r662137_rule

STIG

VMware vRealize Operations Manager 6.x SLES Security Technical Implementation Guide

Version

V2R2

CCIs

CCI-001095

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. 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.

Check Content

Check that SLES for vRealize is 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

Configure 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