CVE-2017-6658 : Security Advisory and Response

Cisco Sourcefire Snort 3.0 before build 233 has a Buffer Overread vulnerability due to an incorrect array size, potentially leading to reading beyond the array's boundaries.

Understanding CVE-2017-6658

One issue found in Cisco Sourcefire Snort 3.0 prior to build 233 is a Buffer Overread related to the utilization of a decoder array.

What is CVE-2017-6658?

The vulnerability in Snort 3.0 before build 233 allows reading beyond the array's boundaries when encountering an ether type of 0xFFFF due to an incorrect array size.

The Impact of CVE-2017-6658

The Buffer Overread issue could be exploited by attackers to potentially access sensitive information or execute arbitrary code on affected systems.

Technical Details of CVE-2017-6658

Cisco Sourcefire Snort 3.0 vulnerability details.

Vulnerability Description

Type: Buffer Overread
Connected to: Utilization of a decoder array
Resolution: Increase the size of the array

Affected Systems and Versions

Product: Snort 3.0 All versions prior to build 233

Exploitation Mechanism

Attackers can exploit the vulnerability by encountering an ether type of 0xFFFF, leading to reading beyond the array's boundaries.

Mitigation and Prevention

Steps to address and prevent CVE-2017-6658.

Immediate Steps to Take

Apply the necessary patch provided by the vendor to fix the array size issue.
Monitor network traffic for any signs of exploitation.

Long-Term Security Practices

Regularly update and patch Snort installations to prevent known vulnerabilities.
Implement network segmentation to limit the impact of potential attacks.

Patching and Updates

Ensure all Snort installations are updated to build 233 or later to mitigate the Buffer Overread vulnerability.