Proxy Address Resolution Protocol (Proxy ARP) must not be enabled on the system.

From Oracle Linux 5 Security Technical Implementation Guide

Part of GEN003608

Associated with: CCI-001551

SV-64201r1_rule Proxy Address Resolution Protocol (Proxy ARP) must not be enabled on the system.

Vulnerability discussion

Proxy ARP allows a system to respond to ARP requests on one interface on behalf of hosts connected to another interface. If this function is enabled when not required, addressing information may be leaked between the attached network segments.

Check content

Verify the system does not use proxy ARP. # grep [01] /proc/sys/net/ipv4/conf/*/proxy_arp|egrep "default|all" If all of the resulting lines do not end with "0", this is a finding.

Fix text

Configure the system to not use proxy ARP. Edit /etc/sysctl.conf and add a setting for "net.ipv4.conf.all.proxy_arp=0" and "net.ipv4.conf.default.proxy_arp=0". # sysctl -p

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