Ensure default deny firewall policy

中级别 1自动化linux

说明

A default deny all policy on connections ensures that any unconfigured network usage will be rejected.

检查方式

审计方法: Shell 命令

shell

alt0() { command -v iptables >/dev/null 2>&1 || { echo "step1: iptables not installed"; return 1; }; o=$(bash -c 'iptables -L Chain INPUT (policy DROP)' 2>&1); printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- 'Chain FORWARD (policy DROP)' || { echo step1: missing 'Chain FORWARD (policy DROP)'; return 1; }; printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- 'Chain OUTPUT (policy DROP)' || { echo step1: missing 'Chain OUTPUT (policy DROP)'; return 1; }; }; if alt0; then echo compliant; fi

预期输出: compliant

修复方式

修复方法: 操作指南或基础设施补丁

Run the following commands to implement a default DROP policy: # iptables -P INPUT DROP # iptables -P OUTPUT DROP # iptables -P FORWARD DROP

属性

操作系统: sles-11
标签: cis-convertedlinux
参考: CIS SUSE Linux Enterprise 11 Benchmark v2.1.1 - 3.6.2

检查本机

请在您有权审计的机器上运行此命令。扫描为只读操作。

shell

tmaegis scan --target linux