ET POLICY Externally Hosted Fortinet Endpoint Management Server (EMS) FortiClient Onboarding URI Scheme Observed

SID: 2066504Rev: 12 views
Sourceet/open
CreatedDecember 30, 2025
UpdatedDecember 30, 2025
Classificationmisc-activity
alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET POLICY Externally Hosted Fortinet Endpoint Management Server (EMS) FortiClient Onboarding URI Scheme Observed"; flow:established,to_client; http.response_body; content:"fabricagent|3a 2f 2f|ems/onboarding?username="; fast_pattern; reference:url,www.sonarsource.com/blog/caught-in-the-fortinet-how-attackers-can-exploit-forticlient-to-compromise-organizations-1-3/; classtype:misc-activity; sid:2066504; rev:1; metadata:affected_product FortiClient_EMS, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_12_30, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Informational, updated_at 2025_12_30; target:dest_ip;)

References

urlwww.sonarsource.com/blog/caught-in-the-fortinet-how-attackers-can-exploit-forticlient-to-compromise-organizations-1-3/

Metadata

affected productFortiClient_EMS
attack targetClient_Endpoint
tls stateTLSDecrypt
created at2025_12_30
deploymentSSLDecrypt
confidenceHigh
signature severityInformational
updated at2025_12_30

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