Ensure sticky bit is set on all world-writable directories

MoyenneNiveau 1Automatiséeros

Description

Setting the sticky bit on world writable directories prevents users from deleting or renaming files in that directory that are not owned by them. The audit searches local filesystems for world-writable directories without the sticky bit and requires none. Host-level control from the CIS ROS Melodic benchmark (Ubuntu 18.04 robot hosts); run as root.

Méthode de vérification

Méthode d'audit: Commande shell

shell

command -v findmnt >/dev/null 2>&1 || exit 1
mps=$(findmnt -rn -l -o TARGET,FSTYPE | awk '$2 !~ /^(nfs|nfs4|cifs|smb3|smbfs|fuse|proc|sysfs|tmpfs|devtmpfs|devpts|cgroup|cgroup2|pstore|securityfs|debugfs|tracefs|configfs|bpf|mqueue|hugetlbfs|autofs|binfmt_misc|efivarfs|overlay|squashfs|nsfs|ramfs|fusectl|rpc_pipefs)$/ {print $1}')
out=$(for m in $mps; do find "$m" -xdev -type d \( -perm -0002 -a \! -perm -1000 \) -print 2>/dev/null; done | sort -u | head -n 50)
[ -z "$out" ] && echo compliant || { printf '%s\n' "$out"; echo 'world-writable directories without the sticky bit'; }

Sortie attendue: compliant

Méthode de correction

Méthode de correction: Recommandation ou correctif d'infrastructure

Run the following command to set the sticky bit on all world writable directories: # df --local -P | awk '{if (NR!=1) print $6}' | xargs -I '{}' find '{}' -xdev -type d $ -perm -0002 -a ! -perm -1000 $ 2>/dev/null | xargs -I '{}' chmod a+t '{}'

Propriétés

Systèmes d'exploitation: Tous
Étiquettes: rosros1melodicsystem
Référence: CIS ROS Melodic Benchmark v1.0.0 - 1.1.21 Ensure sticky bit is set on all world-writable directories

Vérifier cet hôte

Exécutez cette commande sur une machine que vous êtes autorisé à auditer. L'analyse est en lecture seule.

shell

tmaegis scan --target ros