Other nomination

Bypassing Flash's local-with-filesystem Sandbox

xssniper

Flash's local-with-filesystem sandbox is meant to stop local SWFs talking to the network, but it enforces this with a protocol handler blacklist. A file:// UNC path already reaches hosts on the local network, and getURL with the unblacklisted mhtml: handler reaches the internet over ports 80 and 443, failing silently on 404 so the victim sees nothing.

Record

Researcher

xssniper

In the archive

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

Tags

• flash
• sandbox-escape
• filter-bypass
• info-leak
• url-parsing
• owasp-a05-2021

This page is the archive's own catalogue record. The research is the work of xssniper, first published at the original source. Preserved copies are kept so the citation survives its host.