PSIRT Advisory

FortiOS VM images lack an integrity check of the file system at boot time

Summary

FortiOS VM appliance lack of root file system integrity check may allow an attacker with read/write access to the VM image (before it is booted up) to inject malicious implants in the image.

Impact

Execute unauthorized code or commands

Affected Products

FortiOS VM all versions below 6.0.5

Solutions

Upgrade to FortiOS VM versions 6.0.5 or 6.2.0


Workarounds:


Verify the VM images' integrity by comparing the SHA-512 checksum with the checksum indicated on https://support.fortinet.com/ (downloads section) for that image.

Acknowledgement

Fortinet is pleased to thank Bart Dopheide, Axians for reporting this vulnerability under responsible disclosure.