Stack-based buffer overflow in FortiOS - CVE-2020-12820
Published: September 30, 2020
Vulnerability identifier: #VU47186
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-12820
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in SSL VPN daemon. A remote authenticated attacker can request a large FortiClient file name, trigger stack-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
FortiOS
How to mitigate CVE-2020-12820
Install updates from vendor's website.
FortiOS - addressed in versions 5.6.13, 6.0.11