Fast CORS misconfiguration vulnerabilities scanner🍻
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About CORScanner
CORScanner is a python tool designed to discover CORS misconfigurations vulnerabilities of websites. It helps website administrators and penetration testers to check whether the domains/urls they are targeting have insecure CORS policies.
Features
- Fast. It uses gevent instead of Python threads for concurrency, which is much faster for network scanning.
- Comprehensive. It covers all the common types of CORS misconfigurations we know.
- Flexible. It supports various self-define features (e.g. file output), which is helpful for large-scale scanning.
Two useful references for understanding CORS systematically: * USENIX security 18 paper: We Still Don’t Have Secure Cross-Domain Requests: an Empirical Study of CORS * 中文详解：绕过浏览器SOP，跨站窃取信息：CORS配置安全漏洞报告及最佳部署实践
Screenshots
Installation
-
Download this tool
git clone https://github.com/chenjj/CORScanner.git
-
Install dependencies
sudo pip install -r requirements.txt
CORScanner depends on therequests
,gevent
,tldextract
,colorama
andargparse
python modules.
Python Version:
- Both Python 2 (2.7.x) and Python 3 (3.7.x) are supported.
Usage
Short Form |
Long Form | Description |
|---|---|---|
| -u | --url | URL/domain to check it's CORS policy |
| -d | --headers | Add headers to the request |
| -i | --input | URL/domain list file to check their CORS policy |
| -t | --threads | Number of threads to use for CORS scan |
| -o | --output | Save the results to json file |
| -v | --verbose | Enable the verbose mode and display results in realtime |
| -h | --help | show the help message and exit |
Examples
- To check CORS misconfigurations of specific domain:
python cors_scan.py -u example.com
- To enable more debug info, use -vvv:
python cors_scan.py -u example.com -vvv
- To check CORS misconfigurations of specific URL:
python cors_scan.py -u http://example.com/restapi
- To check CORS misconfiguration with specific headers:
python cors_scan.py -u example.com -d "Cookie: test"
- To check CORS misconfigurations of multiple domains/URLs:
python cors_scan.py -i top_100_domains.txt -t 100
- To list all the basic options and switches use -h switch:
python cors_scan.py -h
Misconfiguration types
This tool covers the following misconfiguration types:
Misconfiguration type |
Description |
|---|---|
| Reflectanyorigin | Blindly reflect the Origin header value in Access-Control-Allow-Origin headersin responses, which means any website can read its secrets by sending cross-orign requests. |
| Prefixmatch | wwww.example.comtrusts example.com.evil.com, which is an attacker's domain. |
| Suffixmatch | wwww.example.comtrusts evilexample.com, which could be registered by an attacker. |
| Notescapedot | wwww.example.comtrusts wwwaexample.com, which could be registered by an attacker. |
| Substring match | wwww.example.comtrusts example.co, which could be registered by an attacker. |
| Trustnull | wwww.example.comtrusts null, which can be forged by iframe sandbox scripts |
| HTTPStrustHTTP | Risky trust dependency, a MITM attacker may steal HTTPS site secrets |
| Trustanysubdomain | Risky trust dependency, a subdomain XSS may steal its secrets |
| Customthirdparties | Custom unsafe third parties origins like github.io, see more in origins.json file. Thanks @phackt! |
| Specialcharactersbypass | Exploiting browsers’ handling of special characters. Most can only work in Safari except </em>, which can also work in Chrome and Firefox. See more in Advanced CORS Exploitation Techniques. Thanks @Malayke. |
Welcome to contribute more.
Exploitation examples
Here is an example about how to exploit "Reflectanyorigin" misconfiguration on Walmart.com(fixed). Localhost is the malicious website in the video.
Walmart.com video on Youtube:
Here is the exploitation code: ```javascript ```
If you have understood how the demo works, you can read Section 5 and Section 6 of the CORS paper and know how to exploit other misconfigurations.
License
CORScanner is licensed under the MIT license. take a look at the LICENSE for more information.
Credits
This work is inspired by the following excellent researches:
- James Kettle, “Exploiting CORS misconfigurations for Bitcoins and bounties”, AppSecUSA 2016*
- Evan Johnson, “Misconfigured CORS and why web appsec is not getting easier”, AppSecUSA 2016*
- Von Jens Müller, "CORS misconfigurations on a large scale", CORStest*
Version
Current version is 1.0