implementing-cloud-waf-rules

This skill covers deploying and tuning Web Application Firewall rules on AWS WAF, Azure WAF, and Cloudflare to protect cloud-hosted applications against OWASP Top 10 attacks. It details configuring managed rule sets, creating custom rules for business logic protection, implementing rate limiting, deploying bot management, and reducing false positives through rule tuning and logging analysis.

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name	implementing-cloud-waf-rules
description	This skill covers deploying and tuning Web Application Firewall rules on AWS WAF, Azure WAF, and Cloudflare to protect cloud-hosted applications against OWASP Top 10 attacks. It details configuring managed rule sets, creating custom rules for business logic protection, implementing rate limiting, deploying bot management, and reducing false positives through rule tuning and logging analysis.
domain	cybersecurity
subdomain	cloud-security
tags	["cloud-waf","aws-waf","azure-waf","owasp-protection","rate-limiting"]
version	1.0.0
author	mahipal
license	Apache-2.0

Implementing Cloud WAF Rules

When to Use

When deploying new web applications or APIs behind cloud load balancers requiring OWASP protection
When application penetration testing reveals SQL injection, XSS, or other injection vulnerabilities
When experiencing brute force, credential stuffing, or bot attacks against authentication endpoints
When compliance requirements mandate a WAF for PCI-DSS or similar standards
When tuning WAF rules to reduce false positives blocking legitimate application traffic

Do not use for network-level DDoS protection (use AWS Shield or Azure DDoS Protection), for API authentication design (see managing-cloud-identity-with-okta), or for application code-level security fixes (WAF is a compensating control, not a replacement for secure code).

Prerequisites

AWS ALB/CloudFront, Azure Application Gateway, or Cloudflare configured as the application entry point
Application traffic logs for baseline analysis before WAF deployment
Test environment for validating WAF rules before production enforcement
Understanding of application request patterns to minimize false positives

Workflow

Step 1: Deploy Managed Rule Sets

Enable cloud provider managed rule sets that cover OWASP Top 10 vulnerabilities. Start in Count (detection) mode before switching to Block (prevention) mode.

# AWS WAF: Create Web ACL with AWS Managed Rules
aws wafv2 create-web-acl \
  --name production-waf \
  --scope REGIONAL \
  --default-action '{"Allow": {}}' \
  --visibility-config '{
    "SampledRequestsEnabled": true,
    "CloudWatchMetricsEnabled": true,
    "MetricName": "production-waf"
  }' \
  --rules '[
    {
      "Name": "AWSManagedRulesCommonRuleSet",
      "Priority": 1,
      "Statement": {
        "ManagedRuleGroupStatement": {
          "VendorName": "AWS",
          "Name": "AWSManagedRulesCommonRuleSet"
        }
      },
      "OverrideAction": {"Count": {}},
      "VisibilityConfig": {
        "SampledRequestsEnabled": true,
        "CloudWatchMetricsEnabled": true,
        "MetricName": "CommonRuleSet"
      }
    },
    {
      "Name": "AWSManagedRulesSQLiRuleSet",
      "Priority": 2,
      "Statement": {
        "ManagedRuleGroupStatement": {
          "VendorName": "AWS",
          "Name": "AWSManagedRulesSQLiRuleSet"
        }
      },
      "OverrideAction": {"Count": {}},
      "VisibilityConfig": {
        "SampledRequestsEnabled": true,
        "CloudWatchMetricsEnabled": true,
        "MetricName": "SQLiRuleSet"
      }
    },
    {
      "Name": "AWSManagedRulesKnownBadInputsRuleSet",
      "Priority": 3,
      "Statement": {
        "ManagedRuleGroupStatement": {
          "VendorName": "AWS",
          "Name": "AWSManagedRulesKnownBadInputsRuleSet"
        }
      },
      "OverrideAction": {"Count": {}},
      "VisibilityConfig": {
        "SampledRequestsEnabled": true,
        "CloudWatchMetricsEnabled": true,
        "MetricName": "KnownBadInputs"
      }
    }
  ]'

# Rate limiting rule for login endpoint (100 requests per 5 minutes per IP)
aws wafv2 update-web-acl \
  --name production-waf \
  --scope REGIONAL \
  --id <web-acl-id> \
  --lock-token <lock-token> \
  --default-action '{"Allow": {}}' \
  --rules '[
    {
      "Name": "RateLimitLogin",
      "Priority": 0,
      "Statement": {
        "RateBasedStatement": {
          "Limit": 100,
          "AggregateKeyType": "IP",
          "ScopeDownStatement": {
            "ByteMatchStatement": {
              "FieldToMatch": {"UriPath": {}},
              "PositionalConstraint": "STARTS_WITH",
              "SearchString": "/api/auth/login",
              "TextTransformations": [{"Priority": 0, "Type": "LOWERCASE"}]
            }
          }
        }
      },
      "Action": {"Block": {"CustomResponse": {"ResponseCode": 429}}},
      "VisibilityConfig": {
        "SampledRequestsEnabled": true,
        "CloudWatchMetricsEnabled": true,
        "MetricName": "RateLimitLogin"
      }
    }
  ]'

# AWS WAF: Geo-blocking rule
# Block countries not in the allowed list
aws wafv2 create-ip-set \
  --name blocked-ips \
  --scope REGIONAL \
  --ip-address-version IPV4 \
  --addresses "198.51.100.0/24" "203.0.113.0/24"

# Add Amazon IP Reputation rule
# AWSManagedRulesAmazonIpReputationList blocks IPs flagged by AWS threat intelligence

# Enable WAF logging to S3
aws wafv2 put-logging-configuration \
  --logging-configuration '{
    "ResourceArn": "arn:aws:wafv2:us-east-1:123456789012:regional/webacl/production-waf/id",
    "LogDestinationConfigs": ["arn:aws:s3:::waf-logs-bucket"],
    "RedactedFields": [{"SingleHeader": {"Name": "authorization"}}]
  }'

# Query WAF logs with Athena to find false positives
# Find rules triggered most frequently for legitimate traffic
cat << 'EOF' > waf-analysis.sql
SELECT
  terminatingRuleId,
  httpRequest.uri,
  httpRequest.httpMethod,
  COUNT(*) as block_count
FROM waf_logs
WHERE action = 'BLOCK'
  AND timestamp > date_add('day', -7, now())
GROUP BY terminatingRuleId, httpRequest.uri, httpRequest.httpMethod
ORDER BY block_count DESC
LIMIT 20
EOF

# Exclude specific rule from managed rule set that causes false positives
# Example: Exclude SizeRestrictions_BODY for file upload endpoint
aws wafv2 update-web-acl \
  --name production-waf \
  --scope REGIONAL \
  --id <web-acl-id> \
  --lock-token <lock-token> \
  --rules '[{
    "Name": "AWSManagedRulesCommonRuleSet",
    "Priority": 1,
    "Statement": {
      "ManagedRuleGroupStatement": {
        "VendorName": "AWS",
        "Name": "AWSManagedRulesCommonRuleSet",
        "ExcludedRules": [{"Name": "SizeRestrictions_BODY"}]
      }
    },
    "OverrideAction": {"None": {}},
    "VisibilityConfig": {
      "SampledRequestsEnabled": true,
      "CloudWatchMetricsEnabled": true,
      "MetricName": "CommonRuleSet"
    }
  }]'

# Change OverrideAction from Count to None (use rule group's default Block action)
# Update each managed rule group from {"Count": {}} to {"None": {}}
# Monitor CloudWatch metrics for sudden changes in blocked request volume

Term	Definition
Web ACL	Web Access Control List defining the set of rules evaluated against every HTTP request to a protected resource
Managed Rule Group	Pre-configured rule set maintained by the cloud provider or third-party vendor covering common attack patterns
Rate-Based Rule	WAF rule that tracks request rates per IP address and blocks IPs exceeding the threshold within a time window
Count Mode	WAF action that logs matching requests without blocking them, used for rule validation before enforcement
Rule Priority	Numerical ordering determining which rules are evaluated first; lower numbers have higher priority
Custom Response	WAF capability to return specific HTTP status codes and headers when blocking requests
Scope-Down Statement	Condition that narrows a rate-based rule to specific URI paths, methods, or headers
False Positive	Legitimate request incorrectly blocked by a WAF rule, requiring rule tuning or exclusion

Cloud WAF Configuration Report
================================
Web ACL: production-waf
Scope: Regional (us-east-1)
Protected Resources: ALB (arn:aws:elasticloadbalancing:...)
Report Date: 2025-02-23

RULE CONFIGURATION:
  [P0] RateLimitLogin          - BLOCK (100 req/5min/IP)
  [P1] AWSManagedRulesCommon   - BLOCK (1 exclusion: SizeRestrictions_BODY)
  [P2] AWSManagedRulesSQLi     - BLOCK
  [P3] AWSManagedRulesKnownBad - BLOCK
  [P4] AWSManagedRulesBotControl - COUNT (evaluation phase)
  [P5] GeoBlockRule            - BLOCK (12 countries blocked)

TRAFFIC ANALYSIS (Last 7 Days):
  Total Requests:    2,847,293
  Allowed:           2,791,456 (98.0%)
  Blocked:              51,234 (1.8%)
  Counted:               4,603 (0.2%)

TOP BLOCKED RULES:
  RateLimitLogin:              23,456 blocks (45.8%)
  SQLi Detection:               8,234 blocks (16.1%)
  CommonRuleSet (XSS):          7,891 blocks (15.4%)
  GeoBlockRule:                 6,543 blocks (12.8%)
  KnownBadInputs:              5,110 blocks (10.0%)

FALSE POSITIVE ANALYSIS:
  Reported False Positives: 3
  Confirmed False Positives: 1 (SizeRestrictions_BODY for /api/upload)
  Action Taken: Rule exclusion applied