TMA-ROCKY8-5.4.2.6

Ensure root user umask is configured

MoyenneNiveau 1Automatiséelinux

Description

The user file-creation mode mask (umask) is used to determine the file permission for newly created directories and files. In Linux, the default permissions for any newly created directory is 0777 (rwxrwxrwx), and for any newly created file it is 0666 (rw-rw- rw-). The umask modifies the default Linux permissions by restricting (masking) these permissions. The umask is not simply subtracted, but is processed bitwise. Bits set in the umask are cleared in the resulting file mode. umask can be set with either Octal or Symbolic values: • Octal (Numeric) Value - Represented by either three or four

Méthode de vérification

Méthode d'audit: Commande shell

shell

alt0() { o=$(bash -c 'grep -Psi -- '"'"'^\h*umask\h+((\d{1,2}(\d[^7]|[^2- 7]\d)\b)|(u=[rwx]{1,3},)?(((g=[rx]?[rx]?w[rx]?[rx]?\b)(,o=[rwx]{1,3})?)|((g=[ wrx]{1,3},)?o=[wrx]{1,3}\b)))'"'"' /root/.bash_profile /root/.bashrc' 2>/dev/null); [ -z "$o" ] || { echo "step1: $o" | head -c 300; return 1; }; }; if alt0; then echo compliant; fi

Sortie attendue: compliant

Méthode de correction

Méthode de correction: Recommandation ou correctif d'infrastructure

Edit /root/.bash_profile and /root/.bashrc and either: • remove, comment out, or update any line with umask. - OR - • update any line that includes umask to a value of 0027 or more restrictive. Example: umask 027 Note: the Recommendation "Ensure default user umask is configured" includes guidance to set the default umask

Propriétés

Systèmes d'exploitation: rocky-8
Étiquettes: cis-convertedlinux
Référence: CIS Rocky Linux 8 Benchmark v3.0.0 - 5.4.2.6

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 linux