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AUSCERT External Security Bulletin Redistribution
ESB-2020.3285
FortiOS is potentially vulnerable to a Heap buffer overflow.
25 September 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: FortiOS
Publisher: Fortinet
Operating System: Network Appliance
Impact/Access: Denial of Service -- Existing Account
Execute Arbitrary Code/Commands -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-12819
Original Bulletin:
https://fortiguard.com/psirt/FG-IR-20-082
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FortiOS is potentially vulnerable to a Heap buffer overflow.
IR Number : FG-IR-20-082
Date : Sep 24, 2020
Risk : 3/5
Impact : Denial of Service
CVE ID : CVE-2020-12819
CVE ID : CVE-2020-12819
Summary
A heap-based buffer overflow vulnerability in the processing of Link Control
Protocol messages in FortiOS may allow a remote attacker with valid SSL VPN
credentials to crash the SSL VPN daemon by sending a large LCP packet, when
tunnel mode is enabled. Arbitrary code execution may be theoretically possible,
albeit practically very difficult to achieve in this context.
Impact
Denial of Service
Affected Products
FortiOS versions 5.6.12 and below. FortiOS versions 6.0.10 and below. FortiOS
versions 6.2.4 and below. FortiOS versions 6.4.1 and below.
Solutions
Please upgrade to FortiOS versions 5.6.13 or above. Please upgrade to FortiOS
versions 6.0.11 or above. Please upgrade to FortiOS versions 6.2.5 or above.
Please upgrade to FortiOS versions 6.4.2 or above. Workaround: Disable tunnel
mode.
Acknowledgement
Fortinet is pleased to thank Communications Security Establishment (CSEC) for
reporting this vulnerability under responsible disclosure.
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