CVE-2017-7308 : Security Advisory and Response

In the Linux kernel through version 4.10.6, a vulnerability exists in the packet_set_ring function in net/packet/af_packet.c. This flaw allows local users to trigger a denial of service attack or potentially elevate privileges through specially crafted system calls.

Understanding CVE-2017-7308

This CVE entry highlights a security issue in the Linux kernel that could be exploited by attackers to disrupt services or gain unauthorized access.

What is CVE-2017-7308?

The vulnerability in the Linux kernel through version 4.10.6 arises from inadequate validation of specific block-size data in the packet_set_ring function. This oversight can lead to a denial of service attack or privilege escalation for local users.

The Impact of CVE-2017-7308

The consequences of this vulnerability include the potential for a denial of service attack due to an integer signedness error and an out-of-bounds write. Moreover, attackers with the CAP_NET_RAW capability could exploit this flaw to elevate their privileges.

Technical Details of CVE-2017-7308

This section delves into the technical aspects of the CVE, including the vulnerability description, affected systems, and the exploitation mechanism.

Vulnerability Description

The packet_set_ring function in net/packet/af_packet.c in the Linux kernel through 4.10.6 lacks proper validation of certain block-size data, enabling local users to cause a denial of service or gain privileges through crafted system calls.

Affected Systems and Versions

Affected System: Linux kernel through version 4.10.6
Affected Function: packet_set_ring in net/packet/af_packet.c

Exploitation Mechanism

The vulnerability can be exploited by local users through specially crafted system calls, potentially leading to a denial of service attack or privilege escalation if the CAP_NET_RAW capability is held.

Mitigation and Prevention

To address CVE-2017-7308, immediate steps and long-term security practices are crucial.

Immediate Steps to Take

Apply relevant security patches promptly
Monitor system logs for any suspicious activities
Restrict access to vulnerable systems

Long-Term Security Practices

Regularly update and patch all software components
Implement the principle of least privilege to limit user capabilities
Conduct regular security audits and penetration testing

Patching and Updates

Ensure that the Linux kernel is updated to a version beyond 4.10.6 to mitigate the vulnerability effectively.