CVE-2018-20798 : Security Advisory and Response
Learn about CVE-2018-20798, a vulnerability in pfSense 2.4.4_1 that could enable attackers to bypass access restrictions due to mismatched block durations with sshguard. Find mitigation steps and prevention measures here.
This CVE involves a vulnerability in pfSense 2.4.4_1 that could allow attackers to bypass access restrictions due to mismatched block durations with sshguard.
Understanding CVE-2018-20798
What is CVE-2018-20798?
The expiretable configuration in pfSense 2.4.4_1 establishes block durations that are incompatible with the block durations implemented by sshguard, potentially aiding attackers in bypassing intended access restrictions.
The Impact of CVE-2018-20798
The mismatch in block durations could make it easier for attackers to circumvent security measures and gain unauthorized access.
Technical Details of CVE-2018-20798
Vulnerability Description
The setting in pfSense 2.4.4_1 known as "expiretable configuration" has block durations that do not align with those used by sshguard, potentially facilitating attackers in evading access restrictions.
Affected Systems and Versions
- Product: Not applicable
- Vendor: Not applicable
- Version: Not applicable
Exploitation Mechanism
Attackers could exploit the mismatched block durations to bypass intended access restrictions more easily.
Mitigation and Prevention
Immediate Steps to Take
- Monitor for any unusual activity or unauthorized access attempts.
- Consider disabling the affected feature until a patch is available.
Long-Term Security Practices
- Regularly update pfSense to the latest version to ensure security patches are applied.
- Implement network segmentation and access controls to limit the impact of potential breaches.
- Conduct security audits to identify and address any vulnerabilities.
Patching and Updates
Apply any patches or updates provided by pfSense to address the vulnerability and ensure that block durations align with sshguard for enhanced security.