Facebook's URL scanner is vulnerable to cloaking attacks

Members of a hacking think-tank called Blackhat Academy claim that Facebook's URL scanning systems can be tricked into thinking malicious pages are clean by using simple content cloaking techniques. Such attacks involve Web pages filtering out requests that come from specific clients and feeding them content that is different from what is displayed to regular users.

Source: http://www.infoworld.com/d/security/facebooks-url-scanner-vulnerable-cloaking-attacks-175368

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