Fortinet Releases Advisory on New Post-Exploitation Technique for Known Vulnerabilities

Fortinet is aware of a threat actor creating a malicious file from previously exploited Fortinet RCE vulnerabilities within FortiOS and FortiGate products. This malicious file could enable read-only access to files on the devices’ file system, which may include configurations.

CERT Bulgaria encourages administrators to review Fortinet’s advisory and:

• Upgrade to FortiOS versions 7.6.2, 7.4.7, 7.2.11, 7.0.17, 6.4.16 to remove the malicious file and prevent re-compromise;
• Review the configuration of all in-scope devices;
• Reset potentially exposed credentials;
• As a work-around mitigation until the patch is applied, consider disabling SSL-VPN functionality, as exploitation of the file requires the SSL-VPN to be enabled.

For more information:

• Analysis of Threat Actor Activity | Fortinet Blog