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Finding FortiOS devices with runZero

, by Rob King

Today, February 8th, 2024, Fortinet disclosed a serious vulnerability in their FortiOS operating system, used by multiple Fortinet products.

The issue, CVE-2024-21762, allows attackers to execute arbitrary code on vulnerable devices. The vendor has indicated that this is a critical vulnerability.

The vendor reports that there are indications that this vulnerability may be actively exploited in the wild.

What is the impact? #

Upon successful exploitation of these vulnerabilities, attackers can execute arbitrary code on the vulnerable system.

Are updates or workarounds available? #

Fortinet has released an update to mitigate this issue and all users are urged to update immediately.

Additionally, the vendor indicates that disabling the SSL-VPN functionality of the device will mitigate the issue.

How do I find potentially vulnerable FortiOS devices with runZero? #

From the Asset Inventory, use the following query to locate assets running the FortiOS operating system which may potentially be vulnerable:

os:"FortiOS" AND tcp:443

Additional fingerprinting research is ongoing, and additional queries will be published as soon as possible.

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Rob King
Written by Rob King

Rob King is a Principal Researcher at runZero. Over his career Rob has served as a senior researcher with KoreLogic, the architect for TippingPoint DVLabs, and helped get several startups off the ground. Rob helped design SC Magazine's Data Leakage Prevention Product of the Year for 2010, and was awarded the 3Com Innovator of the Year Award in 2009. He has been invited to speak at BlackHat, Shmoocon, SANS Network Security, and USENIX.

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