Ensure SSH PermitUserEnvironment is disabled

中级别 1自动化cos

说明

The PermitUserEnvironment option allows users to present environment options to the ssh daemon. Permitting users the ability to set environment variables through the SSH daemon could potentially allow users to bypass security controls (e.g. setting an execution path that has ssh executing trojan'd programs)

检查方式

审计方法: Shell 命令

shell

alt0() { command -v grep >/dev/null 2>&1 || { echo "step1: grep not installed"; return 1; }; command -v sshd >/dev/null 2>&1 || { echo "step1: sshd not installed"; return 1; }; o=$(bash -c 'sshd -T | grep permituserenvironment' 2>&1); printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- 'PermitUserEnvironment no' || { echo step1: missing 'PermitUserEnvironment no'; 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

Edit the /etc/ssh/sshd_config file to set the parameter as follows: PermitUserEnvironment no

属性

操作系统: 任意
标签: container-optimized-oscosssh
参考: CIS Google Container-Optimized OS Benchmark v1.2.0 - 5.1.12 Ensure SSH PermitUserEnvironment is disabled

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 cos