11
votes
4answers
791 views

Preventing reverse-engineering of client application

I have a web service which is used by a Flash client. Both the service and the Flash client is produced by me (read: my company). The Flash client communicates with the server over HTTPS. One of the ...
2
votes
3answers
269 views

Flash ignores Content-Type header, allowing XSS?

I recently read that the Flash plugin ignores the Content-Type header in certain circumstances. In particular, you can give Flash a URL, and the Flash plugin will happily fetch the content at that ...
4
votes
1answer
201 views

CSRF and Flash/Flex

Flash and Flex clients can make RPC calls to a server using the NetConnection and AMF protocols. It's not uncommon to have these RPC calls setup to authenticate based on a cookie. I've heard ...
1
vote
3answers
432 views

Is it safer to design websites and servers with HTML5 rather than flash?

I run a small business, designing and building websites. Currently our websites we build use Adobe Flash. We are thinking about migrating to HTML 5, are there any security advantages in doing such a ...
4
votes
2answers
954 views

How to pentest Flash file on webapp with alowscriptaccess=samedomain?

In the course of a pentest I found a Flash movie file (swf) that loads another Flash movie through loadMovie. The HTML is this: <embed width="388" height="350" ...
2
votes
2answers
784 views

Why should crossdomain.xml be present if user-uploaded files exist?

In his book Michal Zalewski says: To protect your users, include a top-level crossdomain.xml file with the permitted-cross-domain-policies parameter set to master-only or by-content-type, even if ...
2
votes
2answers
142 views

For untrusted user upload sites: what should the contents of crossdomain.xml and clientaccesspolicy.xml be?

Flash has a long history of ignoring MIME types of files and reading the file directly for executable content or for cross domain execution permissions. That means a malicious user can take advantage ...
4
votes
1answer
5k views

Is the service join.me actually a huge security risk?

In case you don't know, there is a website called join.me which lets you do screen sharing from a browser, using a flash program that is on the web page. Until I encountered this service, I had no ...
8
votes
1answer
975 views

How to perform penetration testing on a Flex application?

Possible Duplicate: What tools are there to inspect Flash SWF files? I have decompiled it, verified the source. All seems fine. Appscan also is not able to find anything in this case. But I ...