CVE-2017-14140 : What You Need to Know
Learn about CVE-2017-14140, a critical vulnerability in the Linux kernel allowing local attackers to access sensitive memory information. Find mitigation steps and update recommendations here.
CVE-2017-14140 was published on September 5, 2017, and affects the Linux kernel prior to version 4.12.9. The vulnerability lies in the move_pages system call, allowing a local attacker to bypass security mechanisms and access sensitive information.
Understanding CVE-2017-14140
This CVE entry highlights a security flaw in the Linux kernel that could be exploited by a malicious actor with local access to compromise the memory structure of a setuid executable.
What is CVE-2017-14140?
The vulnerability in the move_pages system call in the Linux kernel before version 4.12.9 enables an attacker to determine the memory layout of a setuid executable, even when ASLR is enabled.
The Impact of CVE-2017-14140
The lack of verification of the effective uid of the target process allows unauthorized access to sensitive memory information, posing a significant security risk to affected systems.
Technical Details of CVE-2017-14140
This section delves into the specifics of the vulnerability, including affected systems, exploitation mechanisms, and mitigation strategies.
Vulnerability Description
The move_pages system call in mm/migrate.c within the Linux kernel before 4.12.9 fails to validate the effective uid of the target process, enabling a local attacker to discern the memory structure of a setuid executable.
Affected Systems and Versions
- Product: Not applicable
- Vendor: Not applicable
- Versions: All versions before 4.12.9 are affected
Exploitation Mechanism
The vulnerability allows a local attacker to exploit the move_pages system call to bypass security measures and access the memory layout of a setuid executable, even in the presence of ASLR.
Mitigation and Prevention
Protecting systems from CVE-2017-14140 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Update the Linux kernel to version 4.12.9 or later to mitigate the vulnerability
- Monitor system logs for any suspicious activities that could indicate exploitation
Long-Term Security Practices
- Implement the principle of least privilege to restrict access to sensitive resources
- Regularly audit and review system configurations to identify and address security gaps
Patching and Updates
- Stay informed about security advisories from relevant vendors and promptly apply patches to address known vulnerabilities