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Verify that packets with un-routable source addresses are logged for investigation
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npx skills add https://github.com/CyberStrikeus/CyberStrike --skill cis-ubuntu-14-04-lts-3-2-4-ensure-suspicious-packets-are-logged명령은 한 줄로 유지됩니다. 복사하기 전에 가로로 스크롤해 전체 내용을 확인하세요.
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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
SKILL.md 표시 중
SOC 직업 분류 기준
| name | CIS Ubuntu 14.04 LTS - 3.2.4 Ensure suspicious packets are logged |
| description | Verify that packets with un-routable source addresses are logged for investigation |
| category | cis-os-hardening |
| version | 2.1.0 |
| author | cyberstrike-official |
| tags | ["cis","ubuntu","ubuntu-14.04","level-1","scored","network"] |
| cis_id | 3.2.4 |
| cis_benchmark | CIS Ubuntu Linux 14.04 LTS Benchmark v2.1.0 |
| tech_stack | ["ubuntu","linux"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | medium |
When enabled, this feature logs packets with un-routable source addresses to the kernel log.
Enabling this feature and logging these packets allows an administrator to investigate the possibility that an attacker is sending spoofed packets to their system.
Run the following commands and verify output matches:
sysctl net.ipv4.conf.all.log_martians
# Expected: net.ipv4.conf.all.log_martians = 1
sysctl net.ipv4.conf.default.log_martians
# Expected: net.ipv4.conf.default.log_martians = 1
grep "net\.ipv4\.conf\.all\.log_martians" /etc/sysctl.conf /etc/sysctl.d/*
# Expected: net.ipv4.conf.all.log_martians = 1
grep "net\.ipv4\.conf\.default\.log_martians" /etc/sysctl.conf /etc/sysctl.d/*
# Expected: net.ipv4.conf.default.log_martians = 1
net.ipv4.conf.all.log_martians = 1
net.ipv4.conf.default.log_martians = 1
Set the following parameters in /etc/sysctl.conf or /etc/sysctl.d/* file:
net.ipv4.conf.all.log_martians = 1
net.ipv4.conf.default.log_martians = 1
Run the following commands to set the active kernel parameters:
sysctl -w net.ipv4.conf.all.log_martians=1
sysctl -w net.ipv4.conf.default.log_martians=1
sysctl -w net.ipv4.route.flush=1
Not specified. Note: It has been reported that due to Ubuntu bug #50093 this setting (and some others) can fail to apply properly on reboot requiring it to be manually re-applied. One method of accomplishing this is to add sysctl -p to run on reboot to your systems crontab.