CVE-2018-6559 : Exploit Details and Defense Strategies
Learn about CVE-2018-6559, a Linux kernel vulnerability in Ubuntu 18.04 LTS and 18.10 that allows unauthorized local users to access file names, potentially leading to information exposure and security risks. Find mitigation steps and preventive measures here.
In Ubuntu 18.04 LTS and Ubuntu 18.10, a vulnerability in the Linux kernel allows local users to access file names that are typically inaccessible. This exposure occurs through an overlayfs mount within a user namespace, leading to unauthorized access to file information.
Understanding CVE-2018-6559
This CVE entry discloses a security flaw in the Linux kernel affecting specific versions of Ubuntu.
What is CVE-2018-6559?
The vulnerability in the Linux kernel in Ubuntu 18.04 LTS and Ubuntu 18.10 enables local users to gain access to file names that are usually restricted, achieved through an overlayfs mount within a user namespace. This unauthorized access can compromise file security.
The Impact of CVE-2018-6559
The vulnerability allows unauthorized users to view file names that should be protected, potentially leading to information exposure and security breaches.
Technical Details of CVE-2018-6559
This section delves into the technical aspects of the CVE entry.
Vulnerability Description
The Linux kernel in Ubuntu 18.04 LTS and Ubuntu 18.10 permits local users to retrieve file names that are typically inaccessible through an overlayfs mount within a user namespace.
Affected Systems and Versions
- Product: Linux kernel, as used in Ubuntu 18.04 LTS and Ubuntu 18.10
- Vendor: Canonical Ltd.
- Versions: 4.15.0-38.41, 4.18.0-10.11
Exploitation Mechanism
The vulnerability can be exploited by local users to access file names that should be protected, potentially leading to unauthorized information disclosure.
Mitigation and Prevention
Protecting systems from CVE-2018-6559 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply security patches provided by the vendor promptly.
- Monitor system logs for any suspicious activities related to file access.
- Restrict user permissions to minimize the risk of unauthorized file access.
Long-Term Security Practices
- Implement the principle of least privilege to restrict user access to sensitive files.
- Regularly update and patch the Linux kernel to address security vulnerabilities.
Patching and Updates
Regularly check for updates and patches released by Canonical Ltd. for the Linux kernel to mitigate the CVE-2018-6559 vulnerability.