PT-2021-6858 · Fortinet · Fortios

Published 2021-09-13 · Updated 2021-11-04 · CVE-2021-41019

Positive Technologies (AI Summary)

CVSS v2.0

7.1

High

Base vector

AV:N/AC:M/Au:N/C:C/I:N/A:N

Name of the Vulnerable Software and Affected Versions FortiOS versions 6.4.6 and below

Description The issue is related to an improper validation of certificate with host mismatch, which may allow the connection to a malicious LDAP server via options in the GUI. This could lead to the disclosure of sensitive information, such as AD credentials. The vulnerability is associated with insufficient verification of the certificate's CN/SAN, potentially allowing a remote attacker to gain unauthorized access to protected information.

Recommendations For FortiOS versions 6.4.6 and below, update to a version above 6.4.6 to resolve the issue. As a temporary workaround, consider restricting access to the LDAP server options in the GUI to minimize the risk of exploitation.

Fix

Improper Certificate Validation

Weakness Enumeration

CWE-297

CWE-295

Related Identifiers

BDU:2022-02334

CVE-2021-41019

Affected Products

Fortios

References · 10

• https://fortiguard.com/advisory/FG-IR-21-074 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-41019 · Vendor Advisory
• https://bdu.fstec.ru/vul/2022-02334 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-41019 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-41019 · Security Note
• https://fortiguard.fortinet.com/psirt/FG-IR-21-074 · Note
• https://t.me/cibsecurity/31630 · Telegram Post
• https://fortiguard.com/psirt/FG-IR-21-074 · Note
• https://vuldb.com/ru/?id.185947 · Note
• https://cybersecurity-help.cz/vdb/SB2021111604 · Note