SB2020092501 - MitM attack in Fortinet Forticlient

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Main Vulnerability Database SB2020092501

SB2020092501 - MitM attack in Fortinet Forticlient

Published: September 25, 2020

Security Bulletin ID SB2020092501
CSH Severity
High
Patch available
NO
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

High 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper validation of certificate with host mismatch (CVE-ID: N/A)

CWE-ID: CWE-297 - Improper Validation of Certificate with Host Mismatch

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to perform a MitM attack.

The vulnerability exists in FortiClient SSL-VPN client due to the application does not properly validate server certificates and checks only if the certificate was issued by a trusted CA or Fortinet itself. A remote attacker can supply a certificate, issued to a different Fortigate router and perform a Man-in-the-Middle attack.

Successful exploitation of the vulnerability may allow an attacker to intercept and descrypt all traffic, protected with Fortinet SSL-VPN.


Remediation

Cybersecurity Help is not aware of any official remediation provided by the vendor.

References