Ensure permissions on /etc/shells are configured

MoyenneNiveau 1Automatiséefreebsd

Description

/etc/shells is a text file that contains the full pathnames of valid login shells. This file is consulted by chsh and is available to be queried by other programs. It is critical to protect the /etc/shells file from unauthorized access. Although it is protected by default, the file permissions could be changed inadvertently or through malicious actions. Audit: compares `ls -ld` mode (this mode or more restrictive), owner and group with the CIS values.

Méthode de vérification

Méthode d'audit: Commande shell

shell

r=compliant; for f in /etc/shells; do if [ -e "$f" ]; then set -- $(ls -ld "$f"); s=$(printf '%s %s %s\n' "$1" "$3" "$4" | awk -v m='rw-r--r--' -v o='root' -v g='wheel' '{ok=1; for(i=1;i<=9;i++) if(substr(m,i,1)=="-" && substr($1,i+1,1)!="-") ok=0; if(o!="" && $2 !~ ("^(" o ")$")) ok=0; if(g!="" && $3 !~ ("^(" g ")$")) ok=0; print (ok ? "ok" : $0)}'); [ "$s" = ok ] || r="$f: $s"; else r="$f: missing"; fi; done; echo "$r"

Sortie attendue: compliant

Méthode de correction

Méthode de correction: Recommandation ou correctif d'infrastructure

Run the following commands to remove excess permissions, set owner, and set group on /etc/shells: # chmod u-x,go-wx /etc/shells # chown root:wheel /etc/shells

Propriétés

Systèmes d'exploitation: Tous
Étiquettes: freebsdpermissions
Référence: CIS FreeBSD 14 Benchmark v1.0.1 - 6.1.4 Ensure permissions on /etc/shells are configured

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 freebsd