CVE-2019-1126 Explained : Impact and Mitigation
Learn about CVE-2019-1126, a security feature bypass vulnerability in Active Directory Federation Services (ADFS) allowing attackers to bypass the extranet lockout policy and launch password brute-force attacks.
A security feature bypass vulnerability in Active Directory Federation Services (ADFS) could allow attackers to bypass the extranet lockout policy, potentially leading to password brute-force attacks or account lockouts in Active Directory. This CVE is distinct from CVE-2019-0975.
Understanding CVE-2019-1126
This CVE pertains to a vulnerability in ADFS that could be exploited by attackers to bypass security features.
What is CVE-2019-1126?
The vulnerability in ADFS allows attackers to bypass the extranet lockout policy, enabling them to launch password brute-force attacks or trigger account lockouts in Active Directory.
The Impact of CVE-2019-1126
The vulnerability poses a significant security risk as it could compromise the integrity of Active Directory accounts and potentially lead to unauthorized access.
Technical Details of CVE-2019-1126
This section provides detailed technical insights into the vulnerability.
Vulnerability Description
The vulnerability in ADFS allows attackers to bypass security features, potentially leading to password brute-force attacks and account lockouts.
Affected Systems and Versions
- Windows Server 2012 R2
- Windows Server 2012 R2 (Core installation)
- Windows Server 2016
- Windows Server 2016 (Core installation)
- Windows Server version 1803 (Core Installation)
- Windows Server 2019
- Windows Server 2019 (Core installation)
- Windows Server version 1903 (Server Core installation) - unspecified
Exploitation Mechanism
Attackers can exploit this vulnerability by running a specially designed application to bypass the extranet lockout policy in ADFS.
Mitigation and Prevention
Effective measures to mitigate and prevent exploitation of this vulnerability.
Immediate Steps to Take
- Apply the security update provided by Microsoft promptly.
- Monitor Active Directory for any unusual account lockout activities.
- Implement strong password policies to mitigate brute-force attacks.
Long-Term Security Practices
- Regularly update and patch ADFS and Windows Server systems.
- Conduct security audits to identify and address any vulnerabilities.
Patching and Updates
Ensure that all affected systems are updated with the latest security patches from Microsoft.