CVE-2020-25721 Explained : Impact and Mitigation
Learn about CVE-2020-25721, a Samba vulnerability affecting Linux applications. Find out how to mitigate the risk and secure your systems with the necessary updates and security practices.
CVE-2020-25721 is a vulnerability in Samba affecting all versions since Samba 4.0.0. It allows Kerberos acceptors to easily access stable Active Directory (AD) identifiers, such as objectSid, providing a way for Linux applications to obtain a reliable SID and samAccountName in issued tickets.
Understanding CVE-2020-25721
Samba as an Active Directory Domain Controller (AD DC) now offers a solution for Linux applications to retrieve a secure SID and samAccountName in tickets.
What is CVE-2020-25721?
This CVE addresses the need for Kerberos acceptors to have convenient access to stable AD identifiers, enabling Linux applications to acquire a dependable SID and samAccountName in issued tickets.
The Impact of CVE-2020-25721
The vulnerability impacts the security of Samba versions since 4.0.0, potentially allowing unauthorized access to AD identifiers and compromising the integrity of issued tickets.
Technical Details of CVE-2020-25721
Samba versions since 4.0.0 are affected by this vulnerability, with specific details as follows:
Vulnerability Description
The vulnerability allows for easy access to stable AD identifiers, posing a risk to the security of Linux applications utilizing Samba.
Affected Systems and Versions
- Vendor: n/a
- Product: Samba
- Affected Versions: All versions since Samba 4.0.0
- Fixed Versions: v4.15.2, v4.14.10, and v4.13.14
Exploitation Mechanism
The vulnerability can be exploited by malicious actors to gain unauthorized access to AD identifiers, potentially leading to security breaches in Linux applications.
Mitigation and Prevention
To address CVE-2020-25721, consider the following steps:
Immediate Steps to Take
- Update Samba to the fixed versions: v4.15.2, v4.14.10, or v4.13.14
- Monitor for any unauthorized access attempts or unusual activity related to AD identifiers
Long-Term Security Practices
- Regularly update Samba and other software components to mitigate potential vulnerabilities
- Implement strong access controls and authentication mechanisms to safeguard AD identifiers
Patching and Updates
- Apply patches provided by Samba to address the vulnerability
- Stay informed about security advisories and updates from Samba and related vendors