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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.1439
                     Authentication bypass in FortiWAN
                               28 April 2021

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

Product:           FortiWAN
Publisher:         FortiGuard
Operating System:  Network Appliance
Impact/Access:     Administrator Compromise -- Remote/Unauthenticated
                   Delete Arbitrary Files   -- Remote/Unauthenticated
                   Unauthorised Access      -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-26102  

Original Bulletin: 
   https://fortiguard.com/psirt/FG-IR-21-048

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Authentication bypass in FortiWAN

IR Number    : FG-IR-21-048
Date         : Apr 27, 2021
Risk         : 5/5
CVSSv3 Score : 9.8
Impact       : Authentication bypass
CVE ID       : CVE-2021-26102

Summary

A relative path traversal vulnerability (CWE-23) in FortiWAN may allow a remote
non-authenticated attacker to delete files on the system by sending a crafted
POST request. In particular, deleting specific configuration files will reset
the Admin password to its default value.

Impact

Authentication bypass

Affected Products

FortiWAN versions 4.5.7 and below.

Solutions

Please upgrade to FortiWAN upcoming version 4.5.8 or above. Please upgrade to
FortiWAN version 5.1.1 or above. Workaround: Instead of allowing administrative
access from any source, restrict it to trusted internal hosts.

Acknowledgement

Fortinet is pleased to thank a customer who brought this issue to our
attention.

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===========================================================================
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The University of Queensland
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