CRLFsuite: A Professional Overview of the CRLF Injection Scanner
CRLFsuite is a Python-based security tool developed by Devansh Raghav (Raghavd3v), designed for comprehensive detection and exploitation of CRLF injection vulnerabilities, including HTTP response splitting and CRLF-to-XSS chaining attacks ๎จ0๎จ.
๐งฐ Key Features
- Single & multiple URL scanning, with support for reading from stdin
- GET & POST method support, enabling flexible input targeting
- Concurrent requests for fast scanning and low falseโpositive rates
- Automated CRLF payload generation, including evasion techniques
- WAF detection, using signatures from XSStrike and wafw00f
- CRLF injection to XSS chaining, enabling exploitation beyond header manipulation
- Flexible output formats: JSON, plain text, verbose, silent modes
- Resume interrupted scans after Ctrl+C with
--resume option
- Support for multiple headers and Windows compatibility
โ
Installation
Install via pip:
pip3 install crlfsuite
Or clone the repository and install manually:
git clone https://github.com/Raghavd3v/CRLFsuite.git
cd CRLFsuite
sudo python3 setup.py install
```
## โ๏ธ How It Works
1. Accepts target URLs (single, file list, or stdin input).
2. Generates a variety of CRLF payloads, including evasion patterns.
3. Sends HTTP requests and monitors for injected headers or reflected content.
4. Detects CRLF injection or chained XSS outcomes.
5. Reports findings using JSON/text and provides verbose or silent modes.
---
## ๐ก Usage Examples
| Scenario | Command Example |
|----------------|------------------|
| **Single target** | `crlfsuite -t http://example.com/` |
| **Multiple targets** | `crlfsuite -i targets.txt` |
| **POST requests** | `crlfsuite -t http://example.com --method POST -d "param=value"` |
| **Silent mode** | `crlfsuite -t http://example.com -sL` |
| **Verbose mode** | `crlfsuite -t http://example.com -v2` |
| **With cookies** | `crlfsuite -t http://example.com -c "PHPSESSID=abcdef"` |
Use `crlfsuite -h` for a full list of options.
---
## ๐ฏ Why Use CRLFsuite?
- **Targeted focus** on CRLF injection and response splitting.
- **Ease of use** with simple CLI commands or batching via stdin/file input.
- **Adaptability** across platforms (Linux, macOS, Windows).
- **Low false positives**, thanks to heuristics and WAF-aware payload planning.
- **Output flexibility** for integration into automated workflows or bug bounty reporting.
---
## ๐ Real-World Relevance
CRLF injection vulnerabilities can lead to critical issues such as:
- **HTTP header injection / response splitting**
- **Reflected XSS / chained attacks**
- **Cache poisoning**
- **Email header injection**
- **Log injection**
These can enable phishing, session hijacking, or bypass of security filters like SOP or XSS protections.
**CRLFsuite** streamlines detection of these weaknesses, offering scalability and automation for security practitioners and bug bounty hunters.
---
## ๐ ๏ธ Credits & Licensing
- Built by **Raghavd3v**, inspired by Arjun (for prompts), XSStrike, wafw00f, and ParamSpider for WAF signatures and user-agent lists
- Licensed under the **MIT License**
- Available on PyPI and GitHub; latest version is **v2.5.2**, released on **August 16, 2022**, including resume support, multiple headers, verbose modes, and Windows compatibility
## ๐ Conclusion
**CRLFsuite** provides a comprehensive, rapid, and targeted approach to identifying and exploiting CRLF injection and response splitting vulnerabilities. Its feature-rich CLI interface, support for concurrency, resume capabilities, and output modes make it ideal for pentesters, security researchers, and bug bounty hunters looking for precision and automation in CRLF-based testing.
For more details and contributions, refer to the [GitHub repository](https://github.com/Raghavd3v/CRLFsuite).
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