[Dshield] MSFT Internet Explorer, %01 URL spoofing

Johannes B. Ullrich jullrich at sans.org
Wed Dec 17 14:06:20 GMT 2003


> # Exploit ##########
> By opening a window using the http://user@domain nomenclature an
> attacker can hide the real location of the page by including a 0x01
> character after the "@" character.
>           ^^^^^
> 
> The html source of the original POC, and Johannes' web page, all
> correctly have the 0x01 (or whatever..) *before* the ampersand.

Just to illustrate, I included the version with 0x01 *after* the
ampersand. On Mozilla 1.4 under Linux, it attempts to goto 
"fakebank.com", which does not exist (so you get a 'page not found')



-- 
CTO SANS Internet Storm Center               http://isc.sans.org
phone: (617) 786 1563            
  fax: (617) 786 1550                          jullrich at sans.org

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