An anonymous reader quotes a report from ZDNet: A slew of newly discovered vulnerabilities can wreak havoc on 4G LTE network users by eavesdropping on phone calls and text messages, knocking devices offline, and even spoofing emergency alerts. Ten attacks detailed in a new paper by researchers at Purdue University and the University of Iowa expose weaknesses in three critical protocol operations of the cellular network, such as securely attaching a device to the network and maintaining a connection to receive calls and messages. Those flaws can allow authentication relay attacks that can allow an adversary to connect to a 4G LTE network by impersonating an existing user -- such as a phone number. Although authentication relay attacks aren't new, this latest research shows that they can be used to intercept message, track a user's location, and stop a phone from connecting to the network. By using common software-defined radio devices and open source 4G LTE protocol software, anyone can build the tool to carry out attacks for as little as $1,300 to $3,900, making the cost low enough for most adversaries. The researchers aren't releasing the proof-of-concept code until the flaws are fixed, however.