Ensure overlay kernel module is not available

チェック方法

監査方法: シェルコマンド

m=overlay; found=$(find /lib/modules/$(uname -r)/kernel /usr/lib/modules/$(uname -r)/kernel -path "*/overlay*" 2>/dev/null | head -n1); if [ -z "$found" ]; then echo compliant; exit 0; fi; lsmod | awk '{print $1}' | grep -Fxq -- "${m//-/_}" && { echo "$m is loaded"; exit 0; }; cfg=$(modprobe --showconfig 2>/dev/null); printf '%s\n' "$cfg" | grep -Pq -- "^\h*blacklist\h+${m//-/_}\b" || { echo "$m is not blacklisted"; exit 0; }; printf '%s\n' "$cfg" | grep -Pq -- "^\h*install\h+${m//-/_}\h+(/usr)?/bin/(true|false)\b" || { echo "$m install is not disabled"; exit 0; }; echo compliant

期待される出力

compliant

修正方法

修正方法: ガイダンスまたは IaC パッチ

Run the following to unload and disable the overlay kernel module. This can also be done by running the script included below. Run the following commands to unload the overlay kernel module: # modprobe -r overlay 2>/dev/null # rmmod overlay 2>/dev/null Perform the following to disable the overlay kernel module: Create a file ending in .conf with install overlay /bin/false in the /etc/modprobe.d/ directory Example: # printf '\n%s\n' "install overlay /bin/false" >> overlay.conf Create a file ending in .conf with blacklist overlay in the /etc/modprobe.d/ directory Example: # printf '\n%s\n' "blacklist overlay" >> overlay.conf Optional remediation script: This script will perform the above remed…

このホストをチェック

監査が許可されているマシンで実行してください。スキャンは読み取り専用です。

tmaegis scan --target linux --level 2