Technical Tip: Using FortiAnalyzer to detect the FortiOS heap-based buffer overflow in sslvpnd (FG-IR-22-398)

[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 leverage the FortiOS heap-based buffer overflow in sslvpnd (FG-IR-22-398). A report is also provided to gain historical visibility into your logs. Note that this article provides alpha files which are automatically generated. The article will be continually updated as more information becomes available.
Scope	This article contains the files necessary to load an event handler and report into your 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 PSIRT Advisory: https://www.fortiguard.com/psirt/FG-IR-22-398
Solution	What is included in Fortinet_FG-IR-22-398.zip? 1) FG-IR-22-398_event-handler.json This event handler helps identify FG-IR-22-398 detected by FortiGates and other Fortinet products. 2) FG-IR-22-398_report.dat This report displays the findings on FG-IR-22-398 attacks from FortiGates and other Fortinet products.  3) fgt_FG-IR-22-398_event-handler.json The event handler for FortiGate ADOMs is configured for FortiGate logs only. 4) fgt_FG-IR-22-398_report.dat The report for FortiGate ADOMs includes FortiGate charts only. Steps 1) Download the Fortinet_FG-IR-22-398.zip file (contains 4 files). 2) Unzip Fortinet_FG-IR-22-398.zip. 3) Import FG-IR-22-398_event-handler.json or fgt_FG-IR-22-398_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 FG-IR-22-398_report.dat or fgt_FG-IR-22-398_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 FG-IR-22-398_report can be run anytime as determined by an admin user.