CVE-2017-12244 : Exploit Details and Defense Strategies

A potential weakness has been identified in the parsing of IPv6 packets for Cisco Firepower System Software, specifically in the detection engine. This vulnerability could potentially allow an unauthorized attacker to cause a DoS (denial of service) situation or lead to high CPU usage, as the Snort process unexpectedly restarts. The flaw stems from inadequate validation of input in the IPv6 extension header packet fields. This vulnerability affects Cisco Firepower System Software Releases 6.0 and newer, specifically when configured with file action policies on various Cisco devices.

Understanding CVE-2017-12244

This CVE involves a vulnerability in the detection engine parsing of IPv6 packets for Cisco Firepower System Software.

What is CVE-2017-12244?

The vulnerability allows an attacker to exploit inadequate input validation in IPv6 extension header packet fields, potentially causing a DoS situation or high CPU usage.

The Impact of CVE-2017-12244

Unauthorized attackers can cause a DoS situation or high CPU usage by sending malicious IPv6 packets to the detection engine.
This vulnerability affects IPv6 traffic only and can bypass traffic inspection or drop traffic.

Technical Details of CVE-2017-12244

This section provides technical details of the vulnerability.

Vulnerability Description

Improper input validation in IPv6 extension header packet fields.
Exploitable by sending a malicious IPv6 packet to the detection engine.

Affected Systems and Versions

Cisco Firepower System Software Releases 6.0 and newer.
Specifically affects devices like ISR, ASA, FirePOWER Services, AMP for Networks, and more.

Exploitation Mechanism

Attackers exploit the vulnerability by sending malicious IPv6 packets to the detection engine.
Successful exploitation can lead to a DoS situation or high CPU usage.

Mitigation and Prevention

Steps to mitigate and prevent the CVE-2017-12244 vulnerability.

Immediate Steps to Take

Apply the latest security patches provided by Cisco.
Implement network segmentation to limit the impact of potential attacks.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update and patch all software and firmware on Cisco devices.
Conduct security training for employees to recognize and report potential security threats.

Patching and Updates

Cisco has released patches to address this vulnerability.
Ensure all affected systems are updated with the latest software versions.