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TMA-APACHE-4.1

Ensure Access to OS Root Directory Is Denied By Default

AltaNivel 1Automatizadaapache

Descripción

The Apache Directory directive allows for directory specific configuration of access controls and many other features and options. One important usage is to create a default deny policy that does not allow access to operating system directories and files, except for those specifically allowed. This is done by denying access to the OS root directory. The <Directory /> block must contain a single "Require all denied" and no Allow/Deny (or the legacy Order deny,allow + Deny from all with no Allow/Require). Reads the main configuration (APACHE_CONF overrides; default /etc/apache2/apache2.conf, /etc/httpd/conf/httpd.conf or /usr/local/apache2/conf/httpd.conf) and every Include/IncludeOptional file.

Cómo se verifica

Método de auditoría: Comando de shell

shell
c=${APACHE_CONF:-}; if [ -z "$c" ]; then for f in /etc/apache2/apache2.conf /etc/httpd/conf/httpd.conf /usr/local/apache2/conf/httpd.conf /etc/apache2/httpd.conf; do [ -f "$f" ] && { c=$f; break; }; done; fi; [ -r "$c" ] || exit 1; R=$(awk 'tolower($1)=="serverroot"{v=$2; gsub(/"/,"",v); print v; exit}' "$c"); [ -n "$R" ] || R=$(dirname "$c"); shopt -s nocasematch; inc(){ local p g l; [ ${#FUNCNAME[@]} -lt 16 ] || return 0; p=$1; case $p in /*) ;; *) p=$R/$p;; esac; [ -d "$p" ] && p="$p/*"; for g in $p; do [ -f "$g" ] || continue; while IFS= read -r l || [ -n "$l" ]; do if [[ $l =~ ^[[:space:]]*include(optional)?[[:space:]]+\"?([^\"[:space:]]+) ]]; then inc "${BASH_REMATCH[2]}"; else printf '%s\n' "$l"; fi; done < "$g"; done; }; cfg=$(inc "$c" | sed -e 's/^[[:space:]]*//' -e '/^#/d' -e '/^$/d'); shopt -u nocasematch; printf '%s\n' "$cfg" | awk '{l=tolower($0); $0=l} /^<directory[[:space:]]/{dd++; if(dd==1){x=$2; gsub(/[">]/,"",x); r=(x=="/"); if(r) f=1}; next} /^<\/directory>/{dd--; if(dd==0) r=0; next} r && $1=="require"{nr++; if($0~/^require[[:space:]]+all[[:space:]]+denied/) rd++} r && $1=="allow"{al++} r && $1=="deny"{dn++; if($0~/from[[:space:]]+all/) dfa=1} r && $1=="order"{no++; if($0~/deny,[[:space:]]*allow/) oda=1} END{print (f && ((nr==1&&rd==1&&al==0&&dn==0) || (no==1&&oda&&dfa&&al==0&&nr==0)))?"compliant":"noncompliant"}'
Salida esperada
compliant

Cómo se corrige

Método de corrección: Guía o parche de infraestructura

In the main configuration: <Directory /> ... Require all denied ... </Directory> (remove Allow/Deny/other Require lines). Then run apachectl configtest and reload Apache.

Propiedades

Sistemas operativos
Cualquiera
Etiquetas
apacheaccess-control
Referencia
CIS Apache HTTP Server 2.4 Benchmark v2.4.0 - 4.1 Ensure Access to OS Root Directory Is Denied By Default

Verificar este host

Ejecute esto en un equipo que tenga permiso para auditar. El escaneo es de solo lectura.

shell
tmaegis scan --target apache