Ensure world writable files and directories are secured

中レベル 1自動linux

説明

World writable files are the least secure. Data in world-writable files can be modified and compromised by any user on the system. World writable files may also indicate an incorrectly written script or program that could potentially be the cause of a larger compromise to the system's integrity. See the chmod(2) man page for more information. Setting the sticky bit on world writable directories prevents users from deleting or renaming files in that directory that are not owned by them.

チェック方法

監査方法: シェルコマンド

shell

alt0() { o=$(bash -c '#!/usr/bin/env bash

{
   a_path=(-path "*/containers/storage/*" -o -path "*/containerd/*" -o -path "*/kubelet/*" -o -path "*/docker/*" -o -path "/sys/*" -o -path "/snap/*" -o - path "/boot/efi/*")
   while IFS= read -r l_mount; do
      find "$l_mount" -mount -xdev \( "${a_path[@]}" \) -prune -o \
         \( \( -type f -perm -0002 \) -o \( -type d -perm -0002 ! -perm -1000 \) \) \
         -printf '"'"'%y %p\n'"'"' 2>/dev/null
   done < <(findmnt -Dkerno fstype,target | awk '"'"'($1 !~ /^[[:space:]]*(nfs|proc|cifs|smb|vfat|iso9660|efivarfs|selinuxfs|ncpfs)/ && $2 !~ /^(\/run|\/tmp|\/var\/tmp)(\/|$)/){print $2}'"'"')
}' 2>&1); [ -z "$o" ] || { echo "step1: $o" | head -c 300; return 1; }; }; if alt0; then echo compliant; fi

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

• World Writable Files: o It is recommended that write access is removed from other with the command ( chmod o-w <filename> ), but always consult relevant vendor documentation to avoid breaking any application dependencies on a given file. • World Writable Directories: o Set the sticky bit on all world writable directories with the command ( chmod a+t <directory_name> ) Run the following script to: • Remove other write permission from any world writable files • Add the sticky bit to all world writable directories #!/usr/bin/env bash { l_smask='01000' a_file=() a_dir=() a_path=(-path "*/containers/storage/*" -o -path "*/containerd/*" -o -path "*/kubelet/*" -o -path "*/docker/*" -o -path "/sys…

プロパティ

オペレーティングシステム: rocky-9
タグ: cis-convertedlinux
参照: CIS Rocky Linux 9 Benchmark v3.0.0 - 7.1.11

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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。

shell

tmaegis scan --target linux