CVE-2017-11472 : Vulnerability Insights and Analysis

In the Linux kernel prior to version 4.12, a vulnerability exists in the acpi_ns_terminate() function that can be exploited by local users to access sensitive information from kernel memory.

Understanding CVE-2017-11472

This CVE entry highlights a flaw in the Linux kernel that could allow attackers to bypass the KASLR protection mechanism.

What is CVE-2017-11472?

The acpi_ns_terminate() function in the Linux kernel fails to flush the operand cache, leading to a kernel stack dump. This flaw enables local users to retrieve sensitive data from kernel memory and circumvent the KASLR protection mechanism.

The Impact of CVE-2017-11472

The vulnerability allows local users to access sensitive information from kernel memory and bypass the KASLR protection mechanism, potentially leading to unauthorized access and privilege escalation.

Technical Details of CVE-2017-11472

This section delves into the specifics of the vulnerability.

Vulnerability Description

The acpi_ns_terminate() function in drivers/acpi/acpica/nsutils.c fails to flush the operand cache, resulting in a kernel stack dump, which can be exploited by local users to access sensitive information.

Affected Systems and Versions

Affected systems: Linux kernel versions prior to 4.12
Affected versions: All versions prior to 4.12

Exploitation Mechanism

Attackers can exploit this vulnerability by using a specifically crafted ACPI table to access sensitive information from kernel memory and bypass the KASLR protection mechanism.

Mitigation and Prevention

Protecting systems from CVE-2017-11472 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update the Linux kernel to version 4.12 or newer to mitigate the vulnerability
Monitor and restrict access to sensitive kernel memory

Long-Term Security Practices

Implement the principle of least privilege to limit user access
Regularly update and patch the kernel to address security vulnerabilities

Patching and Updates

Apply patches provided by the Linux kernel maintainers to fix the vulnerability
Stay informed about security advisories and updates from trusted sources