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mod_security_crs/mod_security_crs-early-blocking.patch
Luboš Uhliarik b4a46dc2c3 new version 3.3.4
2022-10-01 00:26:13 +02:00

281 lines
8.5 KiB
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diff --git a/crs-setup.conf.example b/crs-setup.conf.example
index b443e77..0fdd5cb 100644
--- a/crs-setup.conf.example
+++ b/crs-setup.conf.example
@@ -234,7 +234,7 @@ SecDefaultAction "phase:2,log,auditlog,pass"
#
-# -- [[ Anomaly Mode Severity Levels ]] ----------------------------------------
+# -- [[ Anomaly Scoring Mode Severity Levels ]] --------------------------------
#
# Each rule in the CRS has an associated severity level.
# These are the default scoring points for each severity level.
@@ -270,7 +270,7 @@ SecDefaultAction "phase:2,log,auditlog,pass"
#
-# -- [[ Anomaly Mode Blocking Threshold Levels ]] ------------------------------
+# -- [[ Anomaly Scoring Mode Blocking Threshold Levels ]] ----------------------
#
# Here, you can specify at which cumulative anomaly score an inbound request,
# or outbound response, gets blocked.
@@ -319,6 +319,35 @@ SecDefaultAction "phase:2,log,auditlog,pass"
# setvar:tx.outbound_anomaly_score_threshold=4"
#
+# -- [[ Early Anomaly Scoring Mode Blocking ]] ------------------------------
+#
+# The anomaly scores for the request and the responses are generally summed up
+# and evaluated at the end of phase:2 and at the end of phase:4 respectively.
+# However, it is possible to enable an early evaluation of these anomaly scores
+# at the end of phase:1 and at the end of phase:3.
+#
+# If a request (or a response) hits the anomaly threshold in this early
+# evaluation, then blocking happens immediately (if blocking is enabled) and
+# the phase 2 (and phase 4 respectively) will no longer be executed.
+#
+# Enable the rule 900120 that sets the variable tx.blocking_early to 1 in order
+# to enable early blocking. The variable tx.blocking_early is set to 0 by
+# default. Early blocking is thus disabled by default.
+#
+# Please note that blocking early will hide potential alerts from you. This
+# means that a payload that would appear in an alert in phase 2 (or phase 4)
+# does not get evaluated if the request is being blocked early. So when you
+# disabled blocking early again at some point in the future, then new alerts
+# from phase 2 might pop up.
+#SecAction \
+# "id:900120,\
+# phase:1,\
+# nolog,\
+# pass,\
+# t:none,\
+# setvar:tx.blocking_early=1"
+
+
# -- [[ Application Specific Rule Exclusions ]] ----------------------------------------
#
# Some well-known applications may undertake actions that appear to be
diff --git a/rules/REQUEST-901-INITIALIZATION.conf b/rules/REQUEST-901-INITIALIZATION.conf
index 5044abd..06a1bb3 100644
--- a/rules/REQUEST-901-INITIALIZATION.conf
+++ b/rules/REQUEST-901-INITIALIZATION.conf
@@ -89,6 +89,15 @@ SecRule &TX:outbound_anomaly_score_threshold "@eq 0" \
ver:'OWASP_CRS/3.3.4',\
setvar:'tx.outbound_anomaly_score_threshold=4'"
+# Default Blocking Early (rule 900120 in setup.conf)
+SecRule &TX:blocking_early "@eq 0" \
+ "id:901115,\
+ phase:1,\
+ pass,\
+ nolog,\
+ ver:'OWASP_CRS/3.3.0',\
+ setvar:'tx.blocking_early=0'"
+
# Default Paranoia Level (rule 900000 in setup.conf)
SecRule &TX:paranoia_level "@eq 0" \
"id:901120,\
diff --git a/rules/REQUEST-949-BLOCKING-EVALUATION.conf b/rules/REQUEST-949-BLOCKING-EVALUATION.conf
index 050eb04..755315f 100644
--- a/rules/REQUEST-949-BLOCKING-EVALUATION.conf
+++ b/rules/REQUEST-949-BLOCKING-EVALUATION.conf
@@ -12,7 +12,66 @@
# -= Paranoia Level 0 (empty) =- (apply unconditionally)
#
-# Summing up the anomaly score.
+# Skipping early blocking
+
+SecRule TX:BLOCKING_EARLY "!@eq 1" \
+ "id:949050,\
+ phase:1,\
+ pass,\
+ t:none,\
+ nolog,\
+ skipAfter:BLOCKING_EARLY_ANOMALY_SCORING"
+
+SecRule TX:BLOCKING_EARLY "!@eq 1" \
+ "id:949051,\
+ phase:2,\
+ pass,\
+ t:none,\
+ nolog,\
+ skipAfter:BLOCKING_EARLY_ANOMALY_SCORING"
+
+# Summing up the anomaly score for early blocking
+
+SecRule TX:PARANOIA_LEVEL "@ge 1" \
+ "id:949052,\
+ phase:1,\
+ pass,\
+ t:none,\
+ nolog,\
+ setvar:'tx.anomaly_score=+%{tx.anomaly_score_pl1}'"
+
+SecRule TX:PARANOIA_LEVEL "@ge 2" \
+ "id:949053,\
+ phase:1,\
+ pass,\
+ t:none,\
+ nolog,\
+ setvar:'tx.anomaly_score=+%{tx.anomaly_score_pl2}'"
+
+SecRule TX:PARANOIA_LEVEL "@ge 3" \
+ "id:949054,\
+ phase:1,\
+ pass,\
+ t:none,\
+ nolog,\
+ setvar:'tx.anomaly_score=+%{tx.anomaly_score_pl3}'"
+
+SecRule TX:PARANOIA_LEVEL "@ge 4" \
+ "id:949055,\
+ phase:1,\
+ pass,\
+ t:none,\
+ nolog,\
+ setvar:'tx.anomaly_score=+%{tx.anomaly_score_pl4}'"
+
+SecAction "id:949059,\
+ phase:2,\
+ pass,\
+ t:none,\
+ nolog,\
+ setvar:'tx.anomaly_score=0'"
+
+SecMarker BLOCKING_EARLY_ANOMALY_SCORING
# NOTE: tx.anomaly_score should not be set initially, but masking would lead to difficult bugs.
# So we add to it.
@@ -93,6 +152,21 @@ SecRule TX:ANOMALY_SCORE "@ge %{tx.inbound_anomaly_score_threshold}" \
severity:'CRITICAL',\
setvar:'tx.inbound_anomaly_score=%{tx.anomaly_score}'"
+SecRule TX:BLOCKING_EARLY "@eq 1" \
+ "id:949111,\
+ phase:1,\
+ deny,\
+ t:none,\
+ msg:'Inbound Anomaly Score Exceeded in phase 1 (Total Score: %{TX.ANOMALY_SCORE})',\
+ tag:'application-multi',\
+ tag:'language-multi',\
+ tag:'platform-multi',\
+ tag:'attack-generic',\
+ ver:'OWASP_CRS/3.3.0',\
+ severity:'CRITICAL',\
+ chain"
+ SecRule TX:ANOMALY_SCORE "@ge %{tx.inbound_anomaly_score_threshold}" \
+ "setvar:'tx.inbound_anomaly_score=%{tx.anomaly_score}'"
SecRule TX:EXECUTING_PARANOIA_LEVEL "@lt 1" "id:949011,phase:1,pass,nolog,skipAfter:END-REQUEST-949-BLOCKING-EVALUATION"
diff --git a/rules/RESPONSE-950-DATA-LEAKAGES.conf b/rules/RESPONSE-950-DATA-LEAKAGES.conf
index 13013de..bf9b03d 100644
--- a/rules/RESPONSE-950-DATA-LEAKAGES.conf
+++ b/rules/RESPONSE-950-DATA-LEAKAGES.conf
@@ -96,7 +96,7 @@ SecRule TX:EXECUTING_PARANOIA_LEVEL "@lt 2" "id:950014,phase:4,pass,nolog,skipAf
#
SecRule RESPONSE_STATUS "@rx ^5\d{2}$" \
"id:950100,\
- phase:4,\
+ phase:3,\
block,\
capture,\
t:none,\
diff --git a/rules/RESPONSE-959-BLOCKING-EVALUATION.conf b/rules/RESPONSE-959-BLOCKING-EVALUATION.conf
index 24130eb..549c07c 100644
--- a/rules/RESPONSE-959-BLOCKING-EVALUATION.conf
+++ b/rules/RESPONSE-959-BLOCKING-EVALUATION.conf
@@ -22,7 +22,67 @@
# -= Paranoia Level 0 (empty) =- (apply unconditionally)
#
-# Summing up the anomaly score.
+
+# Skipping early blocking
+
+SecRule TX:BLOCKING_EARLY "!@eq 1" \
+ "id:959050,\
+ phase:3,\
+ pass,\
+ t:none,\
+ nolog,\
+ skipAfter:BLOCKING_EARLY_ANOMALY_SCORING"
+
+SecRule TX:BLOCKING_EARLY "!@eq 1" \
+ "id:959051,\
+ phase:4,\
+ pass,\
+ t:none,\
+ nolog,\
+ skipAfter:BLOCKING_EARLY_ANOMALY_SCORING"
+
+# Summing up the anomaly score for early blocking
+
+SecRule TX:PARANOIA_LEVEL "@ge 1" \
+ "id:959052,\
+ phase:3,\
+ pass,\
+ t:none,\
+ nolog,\
+ setvar:'tx.outbound_anomaly_score=+%{tx.anomaly_score_pl1}'"
+
+SecRule TX:PARANOIA_LEVEL "@ge 2" \
+ "id:959053,\
+ phase:3,\
+ pass,\
+ t:none,\
+ nolog,\
+ setvar:'tx.outbound_anomaly_score=+%{tx.anomaly_score_pl2}'"
+
+SecRule TX:PARANOIA_LEVEL "@ge 3" \
+ "id:959054,\
+ phase:3,\
+ pass,\
+ t:none,\
+ nolog,\
+ setvar:'tx.outbound_anomaly_score=+%{tx.anomaly_score_pl3}'"
+
+SecRule TX:PARANOIA_LEVEL "@ge 4" \
+ "id:959055,\
+ phase:3,\
+ pass,\
+ t:none,\
+ nolog,\
+ setvar:'tx.outbound_anomaly_score=+%{tx.anomaly_score_pl4}'"
+
+SecAction "id:959059,\
+ phase:4,\
+ pass,\
+ t:none,\
+ nolog,\
+ setvar:'tx.outbound_anomaly_score=0'"
+
+SecMarker BLOCKING_EARLY_ANOMALY_SCORING
# NOTE: tx.anomaly_score should not be set initially, but masking would lead to difficult bugs.
# So we add to it.
@@ -76,6 +136,21 @@ SecRule TX:OUTBOUND_ANOMALY_SCORE "@ge %{tx.outbound_anomaly_score_threshold}" \
ver:'OWASP_CRS/3.3.4',\
setvar:'tx.anomaly_score=+%{tx.outbound_anomaly_score}'"
+SecRule TX:BLOCKING_EARLY "@eq 1" \
+ "id:959101,\
+ phase:3,\
+ deny,\
+ t:none,\
+ msg:'Outbound Anomaly Score Exceeded in phase 3 (Total Score: %{TX.OUTBOUND_ANOMALY_SCORE})',\
+ tag:'application-multi',\
+ tag:'language-multi',\
+ tag:'platform-multi',\
+ tag:'attack-generic',\
+ ver:'OWASP_CRS/3.3.0',\
+ severity:'CRITICAL',\
+ chain"
+ SecRule TX:OUTBOUND_ANOMALY_SCORE "@ge %{tx.outbound_anomaly_score_threshold}" \
+ "setvar:'tx.anomaly_score=%{tx.outbound_anomaly_score}'"
SecRule TX:EXECUTING_PARANOIA_LEVEL "@lt 1" "id:959011,phase:3,pass,nolog,skipAfter:END-RESPONSE-959-BLOCKING-EVALUATION"
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