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Check: GEN003603

HP-UX 11.23 STIG: GEN003603 (in version v1 r8)

Title

The system must not respond to ICMPv4 echoes sent to a broadcast address. (Cat II impact)

Discussion

Responding to broadcast Internet Control Message Protocol (ICMP) echoes facilitates network mapping and provides a vector for amplification attacks.

Check Content

Verify the system does not respond to ICMP ECHO_REQUESTs set to broadcast addresses. # ndd -get /dev/ip ip_respond_to_echo_broadcast If the result is not 0, this is a finding.

Fix Text

Configure the system to not respond to ICMP ECHO_REQUESTs sent to broadcast addresses. # ndd -set /dev/ip ip_respond_to_echo_broadcast 0 Edit /etc/rc.config.d/nddconf and add/set: TRANSPORT_NAME[x]=ip NDD_NAME[x]=ip_respond_to_echo_broadcast NDD_VALUE[x]=0

Additional Identifiers

Rule ID: SV-35025r1_rule

Vulnerability ID: V-22410

Group Title: GEN003603

Expert Comments

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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