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TMA-APACHE-7.8

Ensure Medium Strength SSL/TLS Ciphers Are Disabled

MittelStufe 1Automatisiertapache

Beschreibung

The SSLCipherSuite directive specifies which ciphers are allowed in the negotiation with the client. Disable the medium strength ciphers such as Triple DES (3DES) and IDEA by adding !3DES and !IDEA in the SSLCipherSuite directive. The effective SSLCipherSuite (last one at server level and in each virtual host) is expanded with the local openssl ciphers -v; no resulting suite may use 3DES or IDEA. Fails when no SSLCipherSuite is configured. 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. CIS marks this recommendation Manual; the automated check implements its audit procedure.

So wird geprüft

Prüfmethode: Shell-Befehl

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 '/^$/d'); shopt -u nocasematch; eff(){ printf '%s\n' "$cfg" | awk -v k="$1" '{l=tolower($0)} l~/^<virtualhost/{vh=1; next} l~/^<\/virtualhost>/{if(v!="") print v; v=""; vh=0; next} tolower($1)==tolower(k){if(vh) v=$0; else g=$0} END{if(g!="") print g}'; }; s=$(eff SSLCipherSuite | awk 'tolower($1)=="sslciphersuite"{v=(NF>=3 && ($2=="SSL"||$2=="TLSv1.3"))?$3:$2; if(NF>=3 && $2=="TLSv1.3") next; gsub(/"/,"",v); print v}'); [ -n "$s" ] || { echo noncompliant; exit 0; }; command -v openssl >/dev/null || exit 1; bad=0; while IFS= read -r v; do o=$(openssl ciphers -v "$v" 2>/dev/null) || { bad=1; continue; }; printf '%s\n' "$o" | awk '$5~/3DES|IDEA/' | grep -q . && bad=1; done <<< "$s"; [ "$bad" = 0 ] && echo compliant || echo noncompliant
Erwartete Ausgabe
compliant

So wird behoben

Behebungsmethode: Anleitung oder Infrastruktur-Patch

Add !3DES:!IDEA to every SSLCipherSuite, e.g. SSLCipherSuite ALL:!EXP:!NULL:!LOW:!SSLv2:!RC4:!aNULL:!3DES:!IDEA Then run apachectl configtest and reload Apache.

Eigenschaften

Betriebssysteme
Beliebig
Tags
apachetls
Referenz
CIS Apache HTTP Server 2.4 Benchmark v2.4.0 - 7.8 Ensure Medium Strength SSL/TLS Ciphers Are Disabled

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