Technical Tip: Using FortiAnalyzer to detect Confluence OGNL RCE | CVE-2022-26134

[ck_FTNT]

Description	This article describes how to use a custom event handler in FortiAnalyzer to raise alerts for incident response related to attacks that attempt to exploit the remote code execution vulnerability CVE-2022-26134.
Scope	This article contains the files necessary to load an event handler and report into the FortiAnalyzer for either a Fabric ADOM or a FortiGate ADOM. The Fabric report and event handler leverage logs from other Fortinet products that can be used to detect the attack in addition to FortiGate logs. For more information about this attack, see the following FortiGuard Outbreak Alert: https://www.fortiguard.com/outbreak-alert/confluence-ognl
Solution	What is included in Fortinet_Confluence_OGNL.zip? 1) Confluence_OGNL_event-handler.json This event handler helps identify Confluence OGNL attacks detected by FortiGates and other Fortinet products. 2) Confluence_OGNL_report.dat This report displays the findings on Confluence OGNL attacks from FortiGates and other Fortinet products.  3) fgt_Confluence_OGNL_event-handler.json The event handler for FortiGate ADOMs is configured for FortiGate logs only. 4) fgt_Confluence_OGNL_report.dat The report for FortiGate ADOMs includes FortiGate charts only. Steps: 1) Download the Fortinet_Confluence_OGNL.zip file (which contains 4 files). 2)  Unzip Fortinet_Confluence_OGNL.zip. 3)  Import Confluence_OGNL_event-handler.json or fgt_Confluence_OGNL_event-handler.json event handler: - Choose an ADOM (if ADOMs are enabled). The ADOM may be of type Fabric or FortiGate. - Choose the FortiSOC module.  - Select Event Handler List. - Select the Import option under More. - Select the appropriate event handler depending on the ADOM type. Result: The event handler is enabled and will be triggered if the appropriate logs are received following the import of the event handler.  Edit the event handler to customize the notification section. 4) Import Confluence_OGNL_report.dat or fgt_Confluence_OGNL_report.dat to Reports: - Choose an ADOM (if ADOMs are enabled). ADOM may be of type Fabric or FortiGate. - Choose the Report module. - Select the Import option under 'More'. - Select the appropriate file for the ADOM type to add the report to the ADOM. Result:  The Confluence_OGNL_report can be run anytime as determined by an admin user.