CVE-2019-1649 : Exploit Details and Defense Strategies

A vulnerability in Cisco's Secure Boot implementation could allow a local attacker to modify firmware images on hardware components, potentially rendering the device unusable or enabling the installation of malicious software.

Understanding CVE-2019-1649

This CVE involves a flaw in access control logic in Cisco's Secure Boot, impacting various Cisco products supporting hardware-based Secure Boot functionality.

What is CVE-2019-1649?

The vulnerability allows an authenticated local attacker to write modified firmware images to hardware components, specifically the Field Programmable Gate Array (FPGA) section of the Secure Boot hardware implementation.

The Impact of CVE-2019-1649

Successful exploitation could lead to device bricking, requiring hardware replacement or manipulation of Secure Boot verification processes.
Attackers could potentially install and boot malicious software images.

Technical Details of CVE-2019-1649

This section provides detailed technical insights into the vulnerability.

Vulnerability Description

Inadequate check on the code area managing FPGA updates leads to the vulnerability.

Affected Systems and Versions

Affected product: Cisco Routers
Vulnerable versions: Less than 16.12.1
Version type: Custom

Exploitation Mechanism

Attacker needs elevated privileges and access to the underlying operating system to write modified firmware images to the FPGA.

Mitigation and Prevention

Protecting systems from CVE-2019-1649 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor-provided patches promptly.
Restrict access to privileged accounts.
Monitor and audit firmware changes.

Long-Term Security Practices

Implement the principle of least privilege.
Regularly update and patch systems.
Conduct security training and awareness programs.

Patching and Updates

Regularly check for security advisories and updates from Cisco.