Ensure permissions on /etc/shells are configured

中レベル 1自動freebsd

説明

/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.

チェック方法

監査方法: シェルコマンド

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"

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 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

プロパティ

オペレーティングシステム: すべて
タグ: freebsdpermissions
参照: CIS FreeBSD 14 Benchmark v1.0.1 - 6.1.4 Ensure permissions on /etc/shells are configured

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shell

tmaegis scan --target freebsd