Main Vulnerability Database Vulnerabilities #VU55733

Improper Authentication in Azure Active Directory Connect - CVE-2021-36949

Published: August 10, 2021 / Updated: August 15, 2021

Vulnerability identifier: #VU55733

CSH Severity: Low

CVSS v4: 7.5 [CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-36949

CWE-ID: CWE-287

Exploitation vector: Adjecent network

Exploit availability: Public exploit is available

Vulnerability details

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error in when processing authentication requests in the Microsoft Azure Active Directory Connect. A remote authenticated attacker on the local network can perform a man-in-the-middle (MitM) attack and gain unauthorized access to the application.

Affected software

Azure Active Directory Connect

How to mitigate CVE-2021-36949

Install updates from vendor's website.

Links to Public Exploits and PoC-codes

Exploit #6624 - Check-AAD-Connect-for-CVE-2021-36949-vulnerability (check if Azure AD Connect is affected by the vulnerability described in CVE-2021-36949) (August 15, 2021)

External References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-36949

Related Security Bulletins

Improper Authentication in Microsoft Azure Active Directory Connect