You Don't Need a 0-Day for RCE: A Real-World Kill Chain

The article "You Don’t Need a 0-Day for RCE: A Real-World Kill Chain" provides an in-depth look at how a security researcher exploited a misconfigured web application to achieve Remote Code Execution (RCE) despite the presence of a Web Application Firewall (WAF). The key points and lessons from this real-world scenario are as follows:

Key Points

1. Identifying Misconfigurations:

   • The researcher used techniques like DNS enumeration, subdomain takeover testing, and WAF bypass to find that the backend server was directly accessible.

2. Bypassing Cloudflare/WAF:

   • By resolving the domain name directly to the Origin IP (bypassing Cloudflare), the researcher could send requests straight to the application server without going through the WAF.

3. File Upload Vulnerability:

   • The web application had a file upload feature that did not properly validate file extensions or MIME types, allowing an attacker to upload arbitrary files with malicious content.

4. Exploiting IIS/ASP.NET Misconfiguration:

   • Since the server was running Microsoft IIS and ASP.NET, uploading a .aspx file (which is treated as executable by I

Read the full article at InfoSec Write-ups - Medium

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