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AUSCERT External Security Bulletin Redistribution
ESB-2020.3286
FortiGate - Stack-based buffer overflow in SSL VPN daemon
25 September 2020
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AusCERT Security Bulletin Summary
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Product: FortiGate
Publisher: Fortinet
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-12820
Original Bulletin:
https://fortiguard.com/psirt/FG-IR-20-083
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Stack-based buffer overflow in SSL VPN daemon
IR Number : FG-IR-20-083
Date : Sep 24, 2020
Risk : 3/5
Impact : Denial of Service
CVE ID : CVE-2020-12820
CVE ID : CVE-2020-12820
Summary
Under non-default configuration, a stack-based buffer overflow in FortiGate may
allow a remote attacker authenticated to the SSL VPN to crash the FortiClient
NAC daemon (fcnacd) and potentially execute arbitrary code via requesting a
large FortiClient file name. We are not aware of proof of concept code
successfully achieving the latter.
Impact
Denial of Service
Affected Products
FortiOS versions 5.6.12 and below. FortiOS versions 6.0.10 and below.
Solutions
Please upgrade to FortiOS versions 5.6.13 or above. Please upgrade to FortiOS
versions 6.0.11 or above. FortiOS versions 6.2.0 and above are not impacted.
FortiOS versions 6.4.0 and above are not impacted. Workaround: Please ensure
that Fortiheartbeat and Endpoint-Compliance are not both enabled on the same
interface. FortiHeartbeat and Endpoint-Compliance can be disabled on a
particular interface by following the below CLI commands: config system
interface edit interface set endpoint-compliance disable (
Acknowledgement
Fortinet is pleased to thank Communications Security Establishment Canada
(CSEC) for reporting this vulnerability under responsible disclosure.
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