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1:00pm, 12 June 2023

TLP Rating: Clear

Fortigate SSL-VPN Remote Code Execution vulnerability

Update: 26/06/23

A vulnerability has been discovered that affects FortiOS FortiGate devices with SSL-VPN enabled.

This heap-based buffer overflow vulnerability allows for an attacker to run unauthorised code or commands remotely on the affected system.

The vulnerability is tracked as CVE-2023-27997.

What to look for

How to tell if you're at risk

All FortiGate devices running FortiOS with SSL-VPN enabled are potentially at risk.

  • FortiOS-6K7K version 7.0.10

  • FortiOS-6K7K version 7.0.5

  • FortiOS-6K7K version 6.4.12

  • FortiOS-6K7K version 6.4.10

  • FortiOS-6K7K version 6.4.8

  • FortiOS-6K7K version 6.4.6

  • FortiOS-6K7K version 6.4.2

  • FortiOS-6K7K version 6.2.9 through 6.2.13

  • FortiOS-6K7K version 6.2.6 through 6.2.7

  • FortiOS-6K7K version 6.2.4

  • FortiOS-6K7K version 6.0.12 through 6.0.16

  • FortiOS-6K7K version 6.0.10

  • FortiProxy version 7.2.0 through 7.2.3

  • FortiProxy version 7.0.0 through 7.0.9

  • FortiProxy version 2.0.0 through 2.0.12

  • FortiProxy 1.2 all versions

  • FortiProxy 1.1 all versions

  • FortiOS version 7.2.0 through 7.2.4

  • FortiOS version 7.0.0 through 7.0.11

  • FortiOS version 6.4.0 through 6.4.12

  • FortiOS version 6.2.0 through 6.2.13

  • FortiOS version 6.0.0 through 6.0.16

 

FortiSASE is no longer impacted, issue remediated Q2/23

What to do

Prevention

Upgrade your devices running FortiOS to the latest version as soon as possible.

  • upgrade to FortiOS-6K7K version 7.0.12 or above
  • upgrade to FortiOS-6K7K version 6.4.13 or above
  • upgrade to FortiOS-6K7K version 6.2.15 or above
  • upgrade to FortiOS-6K7K version 6.0.17 or above
  • upgrade to FortiProxy version 7.2.4 or above
  • upgrade to FortiProxy version 7.0.10 or above
  • upgrade to FortiProxy version 2.0.13 or above
  • upgrade to FortiOS version 7.4.0 or above
  • upgrade to FortiOS version 7.2.5 or above
  • upgrade to FortiOS version 7.0.12 or above
  • upgrade to FortiOS version 6.4.13 or above
  • upgrade to FortiOS version 6.2.14 or above
  • upgrade to FortiOS version 6.0.17 or above

Mitigation

For alternative mitigations, CERT NZ recommends disabling SSL-VPN.

More information

Further details can be found here:

Analysis of CVE-2023-27997 and Clarifications on Volt Typhoon Campaign | Fortinet Blog External Link

Official information released by Fortinet will be available here:

PSIRT Advisories | FortiGuard External Link

If you require more information or further support, submit a report on our website or contact us on 0800 CERTNZ.

Report an incident to CERT NZ External Link