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Default configurations of Fortinet’s FortiGate VPN appliance could open organizations to man-in-the-middle (MitM) attacks, according to researchers, where threat actors could intercept important data.
According to the SAM IoT Security Lab, the FortiGate SSL-VPN client only verifies that the certificate used for client authentication was issued by Fortinet or another trusted certificate authority.
“Therefore, an attacker can easily present a certificate issued to a different FortiGate router without raising any flags, and implement a man-in-the-middle attack,” researchers wrote, in an analysis on Thursday.
They added, “An attacker can actually use this to inject his own traffic, and essentially communicate with any internal device in the business, including point of sales, sensitive data centers, etc. This is a major security breach, that can lead to severe data exposure.”
A Shodan search turned up more than 230,000 vulnerable FortiGate appliances using the VPN functionality, researchers found. Out of those, 88% or more than 200,000 businesses, are using the default configuration and can be easily breached in an MitM attack.
While the issue exists in the default configuration of the FortiGard SSL-VPN client, Fortinet does not consider the issue to be a vulnerability, because users have the ability to manually replace the certificate in order to secure their connections appropriately.
Written by: 7 Defence
Cybercrime 7 Defence
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