Information disclosure in FortiOS - CVE-2020-15936

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Main Vulnerability Database Vulnerabilities #VU60931

Information disclosure in FortiOS - CVE-2020-15936

Published: March 1, 2022


Vulnerability identifier: #VU60931
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2020-15936
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Fortinet, Inc
Affected software:
FortiOS

Detailed vulnerability 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.


How to mitigate CVE-2020-15936

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


Sources