From SOLARIS 10 X86 SECURITY TECHNICAL IMPLEMENTATION GUIDE
Part of GEN003604
Associated with: CCI-001551
The processing of Internet Control Message Protocol (ICMP) timestamp requests increases the attack surface of the system. Responding to broadcast ICMP timestamp requests facilitates network mapping and provides a vector for amplification attacks.
Determine the type of zone that you are currently securing. # zonename If the zone is not the global zone, determine if any interfaces are exclusive to the zone: # dladm show-link If the output indicates "insufficient privileges" then this requirement is not applicable. If the zone is the global zone or the non-global zone has exclusive interfaces verify the system does not respond to ICMP timestamp requests set to broadcast addresses. # ndd /dev/ip ip_respond_to_echo_broadcast If the result is not 0, this is a finding.
Configure the system to not respond to ICMP timestamp requests sent to broadcast addresses. # ndd -set /dev/ip ip_respond_to_echo_broadcast 0 Also add this command to a system startup script.
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