In a revelation that shows how the National Security Agency was able to systematically spy on many Cisco Systems customers for the better part of a decade, researchers have uncovered an attack that remotely extracts decryption keys from the company’s now-decommissioned line of PIX firewalls. The discovery is significant because the attack code, dubbed BenignCertain, worked on PIX versions Cisco released in 2002 and supported through 2009. Even after Cisco stopped providing PIX bug fixes in July 2009, the company continued offering limited service and support for the product for an additional four years. Unless PIX customers took special precautions, virtually all of them were vulnerable to attacks that surreptitiously eavesdropped on their VPN traffic.
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