Your phone may not be as secure as it once was.

Zhang Wanqiao, a Chinese researcher from Qihoo, discovered a vulnerability that allows a
hacker to eavesdrop on a conversation, read a user’s text, and track the
smartphone’s location through a 4G LTE weakness.


The vulnerability can be exploited on any 4G
LTE network and is based off of a “fail-safe,” which is typically used during emergencies, such as
natural disasters or phone tower overloads requiring redirection. The hack uses
fake LTE towers to downgrade a phone’s LTE to 3G, and then ultimately down to
2G where several vulnerabilities can be

While researchers brought this vulnerability
up before, 3GPP, the organization that sets mobile data network standards and
enforces them, acknowledged the problem but did nothing to fix it. In 2015, the
issue was brought to the world again in a paper titled Practical attacks against privacy
and availability in 4G/LTE mobile communication systems
. The same year, the
ACLU obtained documents that described the stingray surveillance had identical vulnerabilities. Wanqiao extended the
effective attack outlined by the initial
researchers and presented it at DEFCON 24 in August 2016. Then, at Ruxcon this
month, he demonstrated the attack, proving it can work on all LTE networks with
readily available gear.

A possible reason the vulnerability wasn’t patched may be because it’s a surveillance
technique actively used by law enforcement or intelligent
agencies as a stingray or IMSI catcher
device. While the specifics on how stingrays operate are not entirely clear,
many people have drawn similarities between revealed technology and recent

As a solution to the 4G LTE vulnerability, choose
a VPN that uses OpenVPN, and its TLS
protocol will keep your conversations protected even in the event of an attack.
Do note that older VPN methods, such as PPTP/L2TP/SOCKS
could still leave your device vulnerable. Since the attack uses readily
available hardware and open source software, an attacker could use this on your smartphone at any moment. As we saw
with 3GPP ten years ago, there doesn’t seem to be any plan to fix the

Source: Privacy
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