CVE-2019-1833 : Security Advisory and Response

A vulnerability in the parser of Cisco Firepower Threat Defense (FTD) Software could allow an attacker to bypass SSL/TLS policies, potentially enabling unmonitored traffic to pass through.

Understanding CVE-2019-1833

This CVE involves a flaw in the SSL/TLS protocol parser of Cisco Firepower Threat Defense (FTD) Software, which could be exploited by sending harmful TLS messages to the system.

What is CVE-2019-1833?

The vulnerability in the SSL/TLS protocol parser of Cisco FTD Software allows unauthorized attackers to bypass established policies by incorrectly processing certain attributes within the TLS packet header.

The Impact of CVE-2019-1833

Attackers could circumvent configured policies, potentially allowing unmonitored traffic to pass through.
The base severity score is 5.8, indicating a medium-level impact.

Technical Details of CVE-2019-1833

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The flaw arises from incorrect processing of attributes within the TLS packet header.

Affected Systems and Versions

Product: Cisco Firepower Threat Defense Software
Vendor: Cisco
Affected Version: Unspecified

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Integrity Impact: Low
Privileges Required: None

Mitigation and Prevention

Steps to address and prevent exploitation of CVE-2019-1833.

Immediate Steps to Take

Apply vendor-provided patches or updates promptly.
Monitor vendor advisories for security patches.

Long-Term Security Practices

Regularly update and patch software to mitigate vulnerabilities.
Implement network segmentation and access controls.

Patching and Updates

Ensure all systems running Cisco FTD Software are updated with the latest patches and security updates.