CVE-2017-6346 Explained : Impact and Mitigation

In the Linux kernel version prior to 4.9.13, a race condition in net/packet/af_packet.c allows local users to exploit the vulnerability, potentially leading to a denial of service. This CVE was published on March 1, 2017.

Understanding CVE-2017-6346

This CVE involves a race condition in the Linux kernel that can be triggered by specific system calls, potentially resulting in a denial of service attack.

What is CVE-2017-6346?

The vulnerability in the Linux kernel version before 4.9.13 allows local users to exploit a race condition, leading to a denial of service or other unspecified impacts when using multithreaded applications with specific system calls.

The Impact of CVE-2017-6346

The exploitation of this vulnerability can result in a denial of service attack, particularly when a multithreaded application makes setsockopt system calls with the PACKET_FANOUT option. Other impacts may also occur, although they are not clearly defined.

Technical Details of CVE-2017-6346

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability arises from a race condition in net/packet/af_packet.c in the Linux kernel before version 4.9.13, allowing local users to cause a denial of service or other unspecified impacts through specific system calls.

Affected Systems and Versions

Affected System: Linux kernel versions before 4.9.13
Affected Component: net/packet/af_packet.c
Affected Users: Local users

Exploitation Mechanism

The vulnerability can be exploited by local users through the use of multithreaded applications that make setsockopt system calls with the PACKET_FANOUT option.

Mitigation and Prevention

Protecting systems from CVE-2017-6346 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update to Linux kernel version 4.9.13 or later to mitigate the vulnerability.
Monitor system calls and application behavior for any suspicious activities.

Long-Term Security Practices

Implement the principle of least privilege to restrict user access and capabilities.
Regularly update and patch the Linux kernel and other software components to address security vulnerabilities.

Patching and Updates

Apply patches provided by the Linux kernel maintainers to fix the race condition in net/packet/af_packet.c.
Stay informed about security bulletins and advisories from relevant sources to address emerging threats.