Buffer overflow in FortiOS firmware verification

1) Buffer overflow

EUVDB-ID: #VU55545

Risk: Medium

CVSSv4.0: 5.2 [CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-24018

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error in the firmware verification routine of FortiOS. A remote attacker on the local network can execute arbitrary code via a specifically crafted firmware image.

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

Mitigation

Install updates from vendor's website.

Vulnerable software versions

FortiOS: 6.4.0 - 7.0.0

CPE2.3

• cpe:2.3:o:fortinet:fortios:6.4.0:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.4.1:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.4.3:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.4.4:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.4.5:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:6.4.6:*:*:*:*:*:*:*
• cpe:2.3:o:fortinet:fortios:7.0.0:*:*:*:*:*:*:*

External links

https://www.fortiguard.com/psirt/FG-IR-21-046

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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