CVE-2020-3285 : What You Need to Know

A vulnerability in the Transport Layer Security version 1.3 (TLS 1.3) policy with URL category functionality for Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass a configured TLS 1.3 policy to block traffic for a specific URL.

Understanding CVE-2020-3285

This CVE involves a security flaw in Cisco Firepower Threat Defense Software that could enable an attacker to circumvent TLS 1.3 policies.

What is CVE-2020-3285?

The vulnerability in TLS 1.3 policy with URL category functionality for Cisco Firepower Threat Defense Software allows remote attackers to bypass configured policies and access URLs that should be blocked.

The Impact of CVE-2020-3285

The vulnerability could permit unauthorized access to URLs outside the affected device, which should typically be restricted, posing a risk to the confidentiality and integrity of the system.

Technical Details of CVE-2020-3285

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The flaw arises from a logic error in Snort's handling of connections with the TLS 1.3 policy and URL category configuration.

Affected Systems and Versions

Product: Cisco Firepower Threat Defense Software
Vendor: Cisco
Affected Version: Not applicable

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Privileges Required: None
User Interaction: None
Scope: Changed
Integrity Impact: Low
Confidentiality Impact: None
Availability Impact: None
Base Score: 5.8 (Medium Severity)
Vector String: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Mitigation and Prevention

Protecting systems from CVE-2020-3285 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor-provided patches or updates promptly.
Monitor Cisco's security advisories for any further information or updates.

Long-Term Security Practices

Regularly update and patch all software and firmware.
Implement network segmentation and access controls to limit exposure.

Patching and Updates

Cisco has likely released patches or updates to address this vulnerability. Ensure timely installation of these fixes to mitigate the risk of exploitation.