Bypassing of web filters by using ASCII

Thursday, 22 June 2006, 12:45 AM EST

Of the tested browsers Firefox 1.5, Opera 8.5 and InternetExplorer 6, only the InternetExplorer does this correctly, the others evaluate the bit and display the characters as if they were from the character set ISO-8859-1. Although the behaviour of the InternetExplorer is the correct one, this creates a security risk: the author of a web page can set the bit on arbitraty characters without changing the look of the page. But virus scanners and content filters see completely different characters, so that there programs cannot detect viruses or spam.

At iKu.

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