FortiOS: Reduced Security -- Existing Account

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.1888
         FortiOS - Improper verification of the user certificate's
          chain of trust in FortiGate when connecting to SSL-VPN
                                2 June 2021

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           FortiOS
Publisher:         FortiGuard Labs
Operating System:  Network Appliance
Impact/Access:     Reduced Security -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-24012  

Original Bulletin: 
   https://fortiguard.com/psirt/FG-IR-21-018

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FortiOS - Improper verification of the user certificate's chain of trust in FortiGate when connecting to SSL-VPN

IR Number    : FG-IR-21-018
Date         : Jun 01, 2021
Risk         : 3/5
CVSSv3 Score : 6.4
Impact       : Impersonation
CVE ID       : CVE-2021-24012

Summary

An improper following of a certificate's chain of trust vulnerability in
FortiGate SSL-VPN may allow an LDAP user to connect to VPN with any certificate
that is signed by a trusted Certificate Authority.

Impact

Impersonation

Affected Products

FortiGate version 6.4.0 to 6.4.4. FortiGate versions 5.6.x, 6.0.x and 6.2.x are
NOT impacted by this vulnerability.

Solutions

Please upgrade to FortiGate Version 6.4.5 or above.
Please upgrade to FortiGate Version 7.0.0.

Acknowledgement

Fortinet is pleased to thank Maria Teresa Munoz Blanco from Vectoritcgroup for
reporting this vulnerability under responsible disclosure.

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