CVE-2019-1126 Security feature bypass in Windows Server

Medium 5.3 Published 29 Jul 2019 Updated 4 Aug 2024

An attacker can bypass ADFS extranet lockout policies to launch brute-force attacks or cause account lockouts in Active Directory.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2019-1126?

CVE-2019-1126 is a medium-severity vulnerability in Microsoft Windows Server 2012, published on 29 Jul 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A security feature bypass vulnerability exists in Active Directory Federation Services (ADFS) which could allow an attacker to bypass the extranet lockout policy.To exploit this vulnerability, an attacker could run a specially crafted application, which would allow an attacker to launch a password brute-force attack or cause account lockouts in Active Directory.This security update corrects how ADFS handles external authentication requests., aka 'ADFS Security Feature Bypass Vulnerability'. This CVE ID is unique from CVE-2019-0975.

Weakness: CWE-307

Which versions are affected by CVE-2019-1126?

It affects 3 products.

Products include Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019.

How do I fix CVE-2019-1126?

No fix has been published for CVE-2019-1126 yet. Limit exposure of the affected software until one is available.

Is CVE-2019-1126 being exploited?

There is no known exploitation of CVE-2019-1126 in the wild and no public exploit code.

All Microsoft Windows Server 2012 vulnerabilities

Sources

Also known as GHSA-7f55-8m7r-49x9.