Navigate

Check: GEN003608

SUSE Linux Enterprise Server v11 for System z STIG: GEN003608 (in versions v1 r12 through v1 r9)

Title

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

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

Additional Identifiers

Rule ID: SV-45725r1_rule

Vulnerability ID: V-22415

Group Title: GEN003608

Expert Comments

Expert comments are only available to logged-in users.

CCIs

CCIs tied to check.

Number	Definition
CCI-001551	The organization defines approved authorizations for controlling the flow of information between interconnected systems.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
AC-4	Information Flow Enforcement