[WEB SECURITY] Re: [Full-disclosure] Backdooring Image Files - security notice

HASEGAWA Yosuke yosuke.hasegawa at gmail.com
Mon Dec 18 21:41:58 EST 2006


Hi.

On 12/15/06, pdp (architect) <pdp.gnucitizen at googlemail.com> wrote:
> I will be brief. There is a rather lame/concerning technique, most of
> you know about, that allows JavaScript to be executed upon visiting an
> image file. This issue is not due to some browser error, although
> clearly IE has some issues with it, but it is due to web applications
> not sanitizing user supplied content in a form of links.

On Windows server, FindMimeFromData function can be used IE to
know what kind of file type it is determine with on the server side.
http://msdn.microsoft.com/workshop/networking/moniker/reference/functions/findmimefromdata.asp

Of course, a result may become  mismatch by the browser and
server side.

Or, adding "Content-Disposition: attachment" for response header,
It can be used to prevent executing script on browser directly.

-- 
HASEGAWA Yosuke
    yosuke.hasegawa at gmail.com

----------------------------------------------------------------------------
The Web Security Mailing List: 
http://www.webappsec.org/lists/websecurity/

The Web Security Mailing List Archives: 
http://www.webappsec.org/lists/websecurity/archive/
http://www.webappsec.org/rss/websecurity.rss [RSS Feed]



More information about the websecurity mailing list