CVE-2018-1065 : What You Need to Know

The Linux kernel's netfilter subsystem, up to version 4.15.7, has a vulnerability that allows local users to exploit capabilities, resulting in a denial of service.

Understanding CVE-2018-1065

This CVE involves a vulnerability in the Linux kernel's netfilter subsystem that can be exploited by local users.

What is CVE-2018-1065?

The vulnerability in the netfilter subsystem of the Linux kernel up to version 4.15.7 allows local users to exploit certain capabilities, leading to a denial of service through a NULL pointer dereference.

The Impact of CVE-2018-1065

The specific functions affected by this vulnerability are arpt_do_table, ipt_do_table, and ip6t_do_table in their respective files within the netfilter directories.

Technical Details of CVE-2018-1065

This section provides more technical insights into the CVE.

Vulnerability Description

The vulnerability arises when dealing with a rule blob that includes a jump but lacks a user-defined chain, enabling local users to exploit CAP_NET_RAW or CAP_NET_ADMIN capabilities.

Affected Systems and Versions

Product: Linux kernel 4.15.0-rc9
Versions: Linux kernel 4.15.0-rc9

Exploitation Mechanism

The exploitation involves local users leveraging specific capabilities to trigger a denial of service through a NULL pointer dereference.

Mitigation and Prevention

Protecting systems from CVE-2018-1065 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply patches provided by the respective vendors promptly.
Monitor vendor advisories for updates and security patches.
Restrict access and permissions to critical system components.

Long-Term Security Practices

Regularly update and patch the Linux kernel and associated components.
Implement the principle of least privilege to limit user capabilities.

Patching and Updates

Refer to vendor-specific advisories for patching instructions and updates.