Roger A. Grimes writes: > The applications in question are accepting abitrary input and not > validating correctly. No -- they are handing the input over to the operating system -- which is a reasonable thing to do for things that start with mailto|htpp|... > How is that a Microsoft or Windows problem? Ok, so just Microsoft and Windows: Enter mailto:test%../../../../windows/system32/calc.exe".cmd in "Start/Run" 1) on a system with Windows XP and IE6. Outlook Express is executed as expected. 2) now do the very same thing on a system with Windows XP and IE7. calc.exe is executed. 3) Now do the very same thing on a system with Windows Vista. You get a "... could not be found" No 3rd party software involved, just Microsoft and Windows -- three different reactions. That is not what I would call a reliable and therefor secure basis for applications. You can propably argue in favour of any of those reactions -- but not for all of them. bye, ju -- Juergen Schmidt editor-in-chief heise Security www.heisec.de Heise Zeitschriften Verlag, Helstorferstr. 7, D-30625 Hannover Tel. +49 511 5352 300 FAX +49 511 5352 417 EMail ju@xxxxxxxxx GPG-Key: 0x38EA4970, 5D7B 476D 84D5 94FF E7C5 67BE F895 0A18 38EA 4970