Authentication bypass in FortiWAN



| Updated: 2021-12-09
Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-26102
CWE-ID CWE-287
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
 FortiWAN
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor Fortinet, Inc

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Improper Authentication

EUVDB-ID: #VU52680

Risk: High

CVSSv4.0: 8.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2021-26102

CWE-ID: CWE-287 - Improper Authentication

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error in the authentication process. A remote non-authenticated attacker can send a specially crafted HTTP POST request and delete arbitrary files on the system using directory traversal sequences. In particular, deleting specific configuration files will reset the Admin password to its default value.

Successful exploitation of the vulnerability may allow an attacker to gain full access to the affected system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

FortiWAN: before 5.1.1

CPE2.3 External links

https://fortiguard.com/psirt/FG-IR-21-048


Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.



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