The system must not respond to Internet Control Message Protocol (ICMP) timestamp requests sent to a broadcast address.

From HP-UX 11.31 Security Technical Implementation Guide

Part of GEN003604

Associated with IA controls: ECSC-1

Associated with: CCI-001551

SV-35026r1_rule The system must not respond to Internet Control Message Protocol (ICMP) timestamp requests sent to a broadcast address.

Vulnerability discussion

The processing of 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.

Check content

Verify the system does not respond to ICMP timestamp requests set to broadcast addresses. # ndd -get /dev/ip ip_respond_to_timestamp_broadcast If the result is greater than 0, this is a finding.

Fix text

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

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.

Powered by sagemincer