Remote code execution in FortiGate FortiOS SSL VPN



Published: 2021-12-07
Risk Critical
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-26109
CWE-ID CWE-190
Exploitation vector Network
Public exploit N/A
Vulnerable software
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FortiOS
Operating systems & Components / Operating system

Vendor Fortinet, Inc

Security Bulletin

This security bulletin contains one critical risk vulnerability.

1) Integer overflow

EUVDB-ID: #VU58627

Risk: Critical

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-26109

CWE-ID: CWE-190 - Integer overflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to integer overflow in the SSL VPN interface. A remote non-authenticated attacker can send a specially crafted HTTP request to the SSL VPN interface, trigger integer overflow and execute arbitrary code 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

FortiOS: 6.0.0 - 7.0.0

External links

http://www.fortiguard.com/psirt/FG-IR-21-049


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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



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