CVE-2017-12193 : Security Advisory and Response

In the Linux kernel before version 4.13.11, a vulnerability exists in the assoc_array_insert_into_terminal_node function that can be exploited by local users to cause a denial of service attack through a NULL pointer dereference and subsequent panic.

Understanding CVE-2017-12193

This CVE entry pertains to a flaw in the Linux kernel that allows for a specific type of attack resulting in a denial of service.

What is CVE-2017-12193?

The vulnerability in the Linux kernel before version 4.13.11 allows local users to trigger a denial of service attack by exploiting a flaw in the assoc_array_insert_into_terminal_node function.

The Impact of CVE-2017-12193

The vulnerability can be exploited by local users to cause a denial of service attack through a NULL pointer dereference and subsequent panic, leading to system instability.

Technical Details of CVE-2017-12193

This section provides more technical insights into the vulnerability.

Vulnerability Description

The flaw in the assoc_array_insert_into_terminal_node function mishandles node splitting, enabling the exploitation by local users for a denial of service attack.

Affected Systems and Versions

Product: Linux kernel since 3.13 up to 4.14 (not including)
Versions: Linux kernel since 3.13 up to 4.14 (not including)

Exploitation Mechanism

The vulnerability can be triggered by a specially crafted application using the keyring key type and performing key addition and link creation operations.

Mitigation and Prevention

Protecting systems from this vulnerability requires specific actions.

Immediate Steps to Take

Apply patches provided by the Linux kernel maintainers promptly.
Monitor for any unusual system behavior that could indicate exploitation of the vulnerability.

Long-Term Security Practices

Regularly update the Linux kernel to the latest stable version to ensure all security patches are applied.
Implement the principle of least privilege to restrict user access and minimize the impact of potential attacks.
Conduct regular security audits and penetration testing to identify and address vulnerabilities proactively.
Educate users on safe computing practices to prevent the execution of malicious code.
Consider implementing additional security measures such as intrusion detection systems and firewalls.

Patching and Updates

Ensure that the Linux kernel is regularly updated to the latest stable version to mitigate the vulnerability and protect the system from potential exploitation.