#VU94004 Incorrect calculation in FortiProxy and FortiOS - CVE-2024-26015

Vulnerability identifier: #VU94004

Vulnerability risk: Low

CVSSv4.0: 0.6 [CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2024-26015

CWE-ID: CWE-682

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
FortiProxy
Hardware solutions / Routers & switches, VoIP, GSM, etc
FortiOS
Operating systems & Components / Operating system

Vendor: Fortinet, Inc

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to incorrect parsing of IP addresses when handling zero characters. A remote attacker on the local network can send specially crafted requests and bypass the IP blocklist.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FortiProxy: 7.0.0 - 7.0.18, 7.2.0 - 7.2.10, 7.4.0 - 7.4.3

FortiOS: 7.0.0 - 7.0.15, 7.2.0 - 7.2.8, 7.4.0 - 7.4.3

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External links
https://fortiguard.fortinet.com/psirt/FG-IR-23-446

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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.