CVE-2019-14870 : What You Need to Know
Understand the impact of CVE-2019-14870 affecting Samba versions 4.x.x before 4.9.17, 4.10.x before 4.10.11, and 4.11.x before 4.11.3. Learn about the exploitation risks and mitigation strategies.
CVE-2019-14870 is a vulnerability affecting versions 4.x.x before 4.9.17, 4.10.x before 4.10.11, and 4.11.x before 4.11.3 of Samba. The issue relates to the S4U (MS-SFU) Kerberos delegation model, allowing certain clients to bypass constrained delegation.
Understanding CVE-2019-14870
This section provides insights into the nature and impact of the CVE-2019-14870 vulnerability.
What is CVE-2019-14870?
The vulnerability in CVE-2019-14870 pertains to the S4U (MS-SFU) Kerberos delegation model, enabling specific clients to avoid constrained delegation through S4U2Self or regular Kerberos authentication.
The Impact of CVE-2019-14870
The CVE-2019-14870 vulnerability in Samba versions can lead to security bypass scenarios where clients can be exempt from constrained delegation, posing a risk to the integrity and confidentiality of the system.
Technical Details of CVE-2019-14870
Explore the technical aspects and implications of CVE-2019-14870.
Vulnerability Description
The issue arises from the lack of implementation of the delegation_not_allowed mechanism for S4U2Self in Samba AD DC, resulting in the forwardable flag being set even with the not-delegated flag enabled.
Affected Systems and Versions
- Vendor: Red Hat
- Product: Samba
- Affected Versions:
- All versions 4.11.x before 4.11.3
- All versions 4.10.x before 4.10.11
- All versions 4.x.x before 4.9.17
Exploitation Mechanism
The vulnerability allows clients to bypass constrained delegation by manipulating the forwardable flag, potentially leading to unauthorized access and security breaches.
Mitigation and Prevention
Learn how to address and prevent the CVE-2019-14870 vulnerability.
Immediate Steps to Take
- Apply vendor patches promptly to mitigate the vulnerability.
- Monitor and restrict network access to critical systems.
- Implement strong authentication mechanisms to prevent unauthorized access.
Long-Term Security Practices
- Regularly update and patch software to address known vulnerabilities.
- Conduct security assessments and audits to identify and remediate weaknesses.
- Educate users on secure practices to minimize the risk of exploitation.
Patching and Updates
- Stay informed about security advisories and updates from the vendor.
- Test patches in a controlled environment before applying them to production systems.