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macOS post-exploitation for credential harvesting, DTrace monitoring, TCC bypass, and stealth operations via native tools
Windows userland post-exploitation for credential harvesting, monitoring, AMSI/ETW bypass, and stealth operations
Kubernetes post-exploitation for container escape, secret extraction, RBAC abuse, and cluster persistence
Basierend auf der SOC-Berufsklassifikation
| name | cis-ubuntu1804-v220-3-3-4 |
| description | Ensure broadcast ICMP requests are ignored |
| category | cis-networking |
| version | 2.2.0 |
| author | cyberstrike-official |
| tags | ["cis","ubuntu","linux","ubuntu-18.04","networking","kernel-parameter"] |
| cis_id | 3.3.4 |
| cis_benchmark | CIS Ubuntu Linux 18.04 LTS Benchmark v2.2.0 |
| tech_stack | ["ubuntu","linux"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
Setting net.ipv4.icmp_echo_ignore_broadcasts to 1 will cause the system to ignore all ICMP echo and timestamp requests to broadcast and multicast addresses.
Accepting ICMP echo and timestamp requests with broadcast or multicast destinations for your network could be used to trick your host into starting (or participating) in a Smurf attack. A Smurf attack relies on an attacker sending large amounts of ICMP broadcast messages with a spoofed source address. All hosts receiving this message and responding would send echo-reply messages back to the spoofed address, which is probably not combatable. If many hosts respond to the packets, the amount of traffic on the network could be significantly multiplied.
None.
Run the following command to verify broadcast ICMP requests are ignored:
sysctl net.ipv4.icmp_echo_ignore_broadcasts
grep -E '^\s*net\.ipv4\.icmp_echo_ignore_broadcasts\s*=\s*1\b' /etc/sysctl.conf /etc/sysctl.d/*.conf
net.ipv4.icmp_echo_ignore_broadcasts = 1
Set the following parameter in /etc/sysctl.conf or a /etc/sysctl.d/* file:
net.ipv4.icmp_echo_ignore_broadcasts = 1
Run the following commands to set the active kernel parameters:
sysctl -w net.ipv4.icmp_echo_ignore_broadcasts=1
sysctl -w net.ipv4.route.flush=1
net.ipv4.icmp_echo_ignore_broadcasts = 1
Version 8
4.1 Establish and Maintain a Secure Configuration Process - Establish and maintain a secure configuration process for enterprise assets.
Version 7
5.1 Establish Secure Configurations - Maintain documented, standard security configuration standards for all authorized operating systems and software.
Automated