# Bypassing Technique

## Special character: `, . .. / \ ; % $ ? ' + - < > .,/ .., ., ./ /,/ /;/`

## Technique:

1. URL Encoding &#x20;
2. double / triple encoding
3. different encoding system :  %u2215 %u2216 %u2026
4. non Printable character:   %0a %0d %03 %08 %10 %83 %1c
5. null byte  %00
6. changing HTTP method (HTTP verb temparing)
7. http parameter polution :  ?parm1=value1\&parm1=value2\&parm1=value3
8. Host header: `X-Forwarder-For: X-Fordarded: X-Forwarded-By: X-Forwarded-For-Original:`&#x20;
9. &#x20;

## String Terminators:

```
%00
0x00
//
;
%
!
?
[]
%5B%5D
%09
%0a
%0b
%0c
%0e
```

## Case Switching:

```
POST /api/myProfile 
POST /api/MyProfile 
POST /aPi/MypRoFiLe
```

## Encoding Payloads:

#### demo with wfuzz:

```
wfuzz -z file,wordlist/api/common.txt,base64 http://hapihacker.com/FUZZ
```

```
wfuzz -z list,a-b-c,base64-md5-none -u http://hapihacker.com/api/v2/FUZZ
```

```
wfuzz -d '{"email":"test@example.com", "otp":"FUZZ"}' -H 'content-Type: application/json' -z list,Test1,base64@base64@md5 -u http://domain.com/end-point
```

## Origin Header Spoofing:

```
X-Forwarded-For
X-Forwarded-Host
X-Host
X-Originating-IP
X-Remote-IP
X-Client-IP
X-Remote-Addr
```


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