FortiOS & FortiProxy SSL-VPN Flaw Allows IP Spoofing

A vulnerability has been discovered in Fortinet’s FortiOS SSL-VPN and FortiProxy SSL-VPN. The flaw is identified as FG-23-225 which allows attackers to spoof IP addresses and bypass security controls by sending specially crafted packets.

According to the advisory published by Fortinet, An insufficient verification of data authenticity vulnerability [CWE-345] in FortiOS & FortiProxy SSL-VPN tunnel mode may allow an authenticated VPN user to send (but not receive) packets spoofing the IP of another user via crafted network packets.

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Version                Affected                        Solution

FortiOS 7.4          7.4.0 through 7.4.1      Upgrade to 7.4.2 or above
FortiOS 7.2          7.2.0 through 7.2.7      Upgrade to 7.2.8 or above
FortiOS 7.0          7.0.0 through 7.0.12     Upgrade to 7.0.13 or above
FortiOS 6.4           6.4 all versions            Migrate to a fixed release
FortiOS 6.2          6.2 all versions             Migrate to a fixed release
FortiProxy 7.4      7.4.0 through 7.4.1       Upgrade to 7.4.2 or above
FortiProxy 7.2      7.2.0 through 7.2.7       Upgrade to 7.2.8 or above
FortiProxy 7.0      7.0.0 through 7.0.13      Upgrade to 7.0.14 or above
FortiProxy 2.0      2.0 all versions               Migrate to a fixed release