Vulnerability identifier: #VU60211

Vulnerability risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-43073

CWE-ID: CWE-78

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Fortinet FortiWeb
Server applications / Remote management servers, RDP, SSH

Vendor: Fortinet, Inc

Description

The vulnerability allows a remote user to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation. A remote authenticated user can send specially crafted HTTP requests to to ApplicationDelivery, JsonProtection and WebProtection controllers and execute arbitrary OS commands on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Fortinet FortiWeb: 6.3.0 - 6.3.16, 6.2.0 - 6.2.6, 6.4.0 - 6.4.1, 5.8.0 - 5.8.7, 6.0.0 - 6.0.7, 6.1.0 - 6.1.2, 5.9.0 - 5.9.1

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External links
http://fortiguard.fortinet.com/psirt/FG-IR-21-180

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.