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 PostPost subject: A serious browser vulnerability, but whose?        Posted: Wed Jul 18, 2007 2:07 am 
" Security researchers can't decide whether it's in IE or Firefox "

A serious vulnerability that causes Internet Explorer to launch Firefox and
execute a malicious payload is sparking debate about exactly who is
responsible for the flaw.

The vulnerability, which was widely reported on security blogs, allows an
attacker to remotely execute malicious code on a machine that is running
IE but also has the Mozilla browser installed.
By luring an IE user to a malevolently crafted site, the attacker can cause
Firefox to execute the code without first vetting it for security.

The saying about success having many parents but failure being an
orphan seems fitting here.
Window Snyder, who heads security at Mozilla, wrote today that Mozilla
developers will patch Firefox so it no longer
accepts bad data from IE.
But she stressed that only people browsing with the Microsoft browser
were vulnerable to the attack.

"We recommend that people use Firefox and as always take care when
browsing unknown websites," she wrote.

For its part, Microsoft representatives said company researchers
have "investigated the claim of a vulnerability in Internet Explorer and
found that this is not a vulnerability in a Microsoft product."
Jesper Johansson, a former senior security strategist for Microsoft,
similarly argues that "most definitely" the problem isn't caused by IE.

"Firefox fails to properly validate the parameters, and any fix will have to
come from Mozilla, not Microsoft," he wrote in a blog entry.

A proof of concept exploit found here uses IE to hand off
maliciously-scripted code to a Firefox handler known as "firefoxurl."
Handlers, which also include strings such as "ftp" and "aim," are found in
the address bar and in many cases can be used to get Firefox to carry
out certain actions.

Roger Thompson, CTO of Exploit Prevention Labs, says Microsoft shares
culpability because IE fails to properly validate the input before passing it
along.

"I think it's an IE issue mostly, because if you access the exploit directly
with Firefox, FF warns you that something bad is happening and advises
you to not do it," he said in an instant message.

Source.


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 PostPost subject:        Posted: Wed Jul 18, 2007 3:30 am 
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this is fixed in FireFox 2.0.0.5. The final was released today :)

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"Theory is when you know something, but it doesn't work. Practice is when something works, but you don't know why. Programmers combine theory and practice: Nothing works and they don't know why."


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