Other nomination

How to upload arbitrary file contents cross-domain

CORS lets a plain XMLHttpRequest POST cross-domain without preflight, so an attacker page can hand-build a multipart/form-data body and upload a file of chosen name and content to another site with no user interaction. It needs an upload endpoint that does not authenticate, and it exploits a specification quirk rather than a browser bug, so vendors will not patch it.

In the archive

• Nominated for the 2011 Top 10 Web Hacking Techniques
• Nominated for the 2012 Top 10 Web Hacking Techniques

Related sources

• Cross domain arbitrary file upload Redux
• Demonstration source

Tags

• csrf
• cors
• file-upload
• javascript
• sop-bypass
• http
• owasp-a01-2021

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