America's cybersecurity watchdog has no confidence that the cellular network used by American first responders and the military is secure against digital intrusions, U.S. Senator Ron Wyden said in a letter released Wednesday.
from the Oregon Democrat, a member of the intelligence committee, was addressed to the National Security Agency and the Cybersecurity and Infrastructure Security Agency . It concerns FirstNet, a dedicated mobile network for public safety officials such as emergency workers, firefighters and law enforcement.
CISA declined to comment, saying it would respond to Wyden directly. NSA did not immediately return messages seeking comment. An employee of FirstNet, which was built by AT&T Inc Wyden's letter makes reference to Signaling System No. 7 , a decades-old protocol that allows international cellular networks to exchange information - for example when cell phone users are roaming. The protocol can easily be abused, security experts say, allowing spies or hackers to intercept text messages or pinpoint users' real time locations.
"These security flaws are also a national security issue, particularly if foreign governments can exploit these flaws to target U.S. government personnel," his letter said.
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