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A security researcher, Robert Hansen, known online as Rsnake, has developed a new class of attack that abuses a weakness in many corporate intranets and most browsers to compromise remote machines with persistent JavaScript backdoors.
The attacks rely on the long-term caching policies of some browsers and take advantage of the collisions that can occur when two different networks use the same non-routable IP address space, which happens fairly often because the amount of address space is quite small.
The bottom line is that even a moderately skilled attacker has the ability to compromise remote machines without the use of any vulnerability or weakness in the client software.
Source: threatpost
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