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What is this endpoint?
remote/fgt_lang?lang=/../../../..//////////dev/cmdb/sslvpn_websession
Fortinet FortiGate
What an attacker could do
Exploits the FortiOS path-traversal vulnerability (CVE-2018-13379) to read the SSL VPN session database in cleartext, leaking valid usernames and passwords that let an attacker authenticate to the VPN and pivot into the internal network.
How to defend it
Patch FortiOS to a fixed release, then force-reset all VPN user credentials since exposed passwords may already be compromised; restrict management/SSL-VPN interfaces to trusted source IPs.
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Want to dive deeper into this topic? Check out the official documentation.
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