Authentication bypass in Active Directory Federation Services

Published: 2018-08-14 22:10:45
Severity Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2018-8340
CVSSv3 5.7 [CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]
CWE ID CWE-592
Exploitation vector Network
Public exploit N/A
Vulnerable software Windows Server
Vulnerable software versions Windows Server 2012 R2
Windows Server 2016
Vendor URL Microsoft

Security Advisory

1) Authentication bypass

Description

The vulnerability allows a remote attacker to bypass certain authentication factors.

The vulnerability exists due to an error when processing multi-factor authentication requests within Active Directory Federation Services (AD FS). A remote attacker can bypass certain authentication factors during multi-factor authentication and gain unauthorized access to sensitive data and functionality. 

Remediation

Install updates from vendor's website.

External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8340

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