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.

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

Associated with: CCI-001095

SV-99245r1_rule 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.

Vulnerability 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

Pro Tips

Lavender hyperlinks in small type off to the right (of CSS class id, if you view the page source) point to globally unique URIs for each document and item. Copy the link location and paste anywhere you need to talk unambiguously about these things.

You can obtain data about documents and items in other formats. Simply provide an HTTP header Accept: text/turtle or Accept: application/rdf+xml.