iOS VPNs have Leaked Traffic for More than 2 Years, researcher claims

upnorth

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A security researcher says that Apple's iOS devices don't fully route all network traffic through VPNs, a potential security issue the device maker has known about for years. Michael Horowitz, a longtime computer security blogger and researcher, puts it plainly—if contentiously—in a continually updated blog post. "VPNs on iOS are broken," he says.

Any third-party VPN seems to work at first, giving the device a new IP address, DNS servers, and a tunnel for new traffic, Horowitz writes. But sessions and connections established before a VPN is activated do not terminate and, in Horowitz's findings with advanced router logging, can still send data outside the VPN tunnel while it's active. In other words, you'd expect a VPN to kill existing connections before establishing a connection so they can be re-established inside the tunnel. But iOS VPNs can't seem to do this, Horowitz says, a finding that is backed up by a similar report from May 2020. "Data leaves the iOS device outside of the VPN tunnel," Horowitz writes. "This is not classic/legacy DNS leak, it is a data leak. I confirmed this using multiple types of VPN and software from multiple VPN providers. The latest version of iOS that I tested with is 15.6."
 

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This is not news. I remember reading (I think it was a year ago) an article about how old/-already established connections are kept even when you connect to VPN

Connect to a VPN server, turn on airplane mode, then turn it off. "Your other connections should also reconnect inside the VPN tunnel, though we cannot guarantee this
Yeah. That was pretty much the solution talked about back then.

Edit: Probably this article

 
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