CVE-2017-6074 : Exploit Details and Defense Strategies

Linux kernel vulnerability in handling DCCP_PKT_REQUEST packets.

Understanding CVE-2017-6074

What is CVE-2017-6074?

The function dccp_rcv_state_process in net/dccp/input.c of the Linux kernel version 4.9.11 and earlier mishandles DCCP_PKT_REQUEST packet data structures when in the LISTEN state. This flaw can be exploited by local users to escalate privileges or cause a denial of service through a specific system call.

The Impact of CVE-2017-6074

This vulnerability allows local users to gain root privileges or trigger a denial of service (double free) by utilizing a particular system call.

Technical Details of CVE-2017-6074

Vulnerability Description

The dccp_rcv_state_process function in net/dccp/input.c in the Linux kernel through 4.9.11 mishandles DCCP_PKT_REQUEST packet data structures in the LISTEN state, enabling local users to obtain root privileges or cause a denial of service.

Affected Systems and Versions

Affected Version: Linux kernel 4.9.11 and earlier

Exploitation Mechanism

Attackers can exploit this vulnerability by using an application that makes an IPV6_RECVPKTINFO setsockopt system call.

Mitigation and Prevention

Immediate Steps to Take

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

Long-Term Security Practices

Regularly update the Linux kernel to the latest stable version
Implement the principle of least privilege to limit user access

Patching and Updates

Keep the Linux kernel up to date with the latest security patches