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Cybersecurity researchers have identified more than 1,600 vulnerabilities in the support ecosystem behind the top 5,000 free apps available in the Google Play Store.
While the researchers from Georgia Institute of Technology and The Ohio State University studied only applications in the Google Play Store, applications designed for iOS may share the same backend systems.
The vulnerabilities were found in the backend systems that feed content and advertising to smartphone applications through a network of Cloud-based servers.
The vulnerabilities, affecting multiple app categories, could allow hackers to break into databases that include personal information - and perhaps into users' mobile devices, said the study scheduled to be presented at the 2019 USENIX Security Symposium in the US on Thursday.
"These vulnerabilities affect the servers that are in the cloud, and once an attacker gets on the server, there are many ways they can attack," said Brendan Saltaformaggio, Assistant Professor in Georgia Tech's School of Electrical and Computer Engineering.
The researchers were still investigating whether attackers could get into individual mobile devices connected to vulnerable servers.
"It's a whole new question whether or not they can jump from the server to a user's device, but our preliminary research on that is very concerning," Saltaformaggio added.
In their study, the researchers discovered 983 instances of known vulnerabilities and another 655 instances of zero-day vulnerabilities spanning across the software layers - operating systems, software services, communications modules and web apps - of the Cloud-based systems supporting the apps.
To help developers improve the security of their mobile apps, the researchers have created an automated system called SkyWalker to vet the Cloud servers and software library systems.
SkyWalker can examine the security of the servers supporting mobile applications, which are often operated by Cloud hosting services rather than individual app developers.