CVE-2017-15129 : Exploit Details and Defense Strategies

A security flaw in the Linux kernel prior to version 4.14.11 could allow a local user to cause memory corruption, potentially leading to a system crash.

Understanding CVE-2017-15129

This CVE entry describes a vulnerability in the network namespaces code of the Linux kernel.

What is CVE-2017-15129?

The vulnerability involves the function get_net_ns_by_id() in net/core/net_namespace.c, which fails to verify the net::count value after identifying a peer network in netns_ids idr. This oversight could result in dual deallocation and memory corruption, potentially exploited by a non-administrative local user to cause memory corruption in the kernel, leading to a system crash.

The Impact of CVE-2017-15129

While the flaw could result in a system crash, the likelihood of privilege escalation is considered low.

Technical Details of CVE-2017-15129

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability in the network namespaces code of the Linux kernel could lead to memory corruption due to a flaw in verifying the net::count value.

Affected Systems and Versions

Linux kernel versions v4.0-rc1 through v4.15-rc5 are affected.

Exploitation Mechanism

The vulnerability could be exploited by a non-administrative local user to trigger memory corruption in the kernel.

Mitigation and Prevention

Protective measures to address CVE-2017-15129.

Immediate Steps to Take

Apply relevant patches provided by the Linux kernel maintainers.
Monitor official sources for updates and advisories regarding this vulnerability.

Long-Term Security Practices

Regularly update the Linux kernel to the latest stable version.
Implement the principle of least privilege to limit the impact of potential vulnerabilities.

Patching and Updates

Ensure timely installation of security patches released by the Linux kernel maintainers.