Information disclosure in FortiGate FortiOS



Published: 2022-03-01
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-15936
CWE-ID CWE-200
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		FortiOS
Operating systems & Components / Operating system

Vendor Fortinet, Inc

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Information disclosure

EUVDB-ID: #VU60931

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-15936

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the system via SNI Client Hello TLS packets. A remote attacker can send a specially crafted request to the system and gain access to sensitive information.

Mitigation

Given that there is no systematic way to detect all exfiltration attempts and to exhaustively enumerate all possibilities offered by exfiltration channels, Fortinet has addressed the issue by releasing a set of signatures:

  1. Python/SNICat.A!exploit
    https://www.fortiguard.com/encyclopedia/virus/10069638

  2. SNIcat.Data.Exfiltration.Tool
    https://www.fortiguard.com/encyclopedia/ips/50952

Vulnerable software versions

FortiOS: 6.0.0 - 6.4.3

External links

http://fortiguard.com/advisory/FG-IR-20-091


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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