CVE-2018-20799 : Exploit Details and Defense Strategies

In pfSense version 2.4.4_1, an inconsistency in blocking source IP addresses based on failed HTTPS authentication compared to SSH authentication could potentially enable attackers to bypass access restrictions.

Understanding CVE-2018-20799

In this CVE, a vulnerability in pfSense version 2.4.4_1 allows attackers to exploit inconsistencies in blocking source IP addresses based on failed authentication methods.

What is CVE-2018-20799?

This CVE highlights a deviation from sshguard documentation in pfSense 2.4.4_1, potentially facilitating attackers to bypass access restrictions.

The Impact of CVE-2018-20799

The vulnerability could lead to unauthorized access and compromise of systems due to the inconsistency in blocking source IP addresses.

Technical Details of CVE-2018-20799

In this section, we delve into the technical aspects of the vulnerability.

Vulnerability Description

The inconsistency in blocking source IP addresses based on failed HTTPS authentication compared to SSH authentication in pfSense 2.4.4_1.

Affected Systems and Versions

Product: pfSense
Vendor: N/A
Version: 2.4.4_1

Exploitation Mechanism

Attackers can exploit the inconsistency to bypass intended access restrictions, potentially leading to unauthorized access.

Mitigation and Prevention

Protecting systems from CVE-2018-20799 is crucial to maintaining security.

Immediate Steps to Take

Update pfSense to a patched version that addresses the inconsistency.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly review and update access control policies.
Conduct security audits to identify and address vulnerabilities.

Patching and Updates

Ensure timely installation of security patches and updates to mitigate the vulnerability.