According to ZD Net, they think Firefox is impossible to fix without a total rewrite of key sections of the code. The ironically named Window Snyder, the Mozzarella Foundation's security supremeo, said she was going to do a bit of investigating.
She thought it might be a variation on an old attack, although that is exactly what Spiegelmock and Wbeelsoi are saying.
Snyder does not think that the flaw is so critical that it cannot be fixed without a patch.
More at ZD Net. µ
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