CVE-2020-3455 : What You Need to Know
Learn about CVE-2020-3455, a vulnerability in Cisco FXOS Software allowing attackers to bypass secure boot mechanisms. Find mitigation steps and long-term security practices here.
A vulnerability in the secure boot process of Cisco FXOS Software could allow an authenticated, local attacker to bypass secure boot mechanisms. The vulnerability is due to insufficient protections of the secure boot process, enabling an attacker to inject code into a specific file during the device boot process.
Understanding CVE-2020-3455
This CVE involves a security flaw in Cisco FXOS Software that could be exploited by an attacker to compromise the boot process of Firepower 4100/9300 Series Appliances.
What is CVE-2020-3455?
The vulnerability allows a local attacker to bypass secure boot mechanisms by injecting malicious code into a file referenced during device boot, compromising the device's boot process.
The Impact of CVE-2020-3455
- CVSS Base Score: 6.7 (Medium Severity)
- Attack Vector: Local
- Attack Complexity: Low
- Privileges Required: High
- Confidentiality Impact: High
- Integrity Impact: High
- Availability Impact: High
Technical Details of CVE-2020-3455
This section provides detailed technical information about the vulnerability.
Vulnerability Description
The vulnerability in Cisco FXOS Software allows an attacker to break the chain of trust and inject code into the device's boot process, leading to persistent execution of malicious code across reboots.
Affected Systems and Versions
- Affected Product: Cisco Firepower Extensible Operating System (FXOS)
- Affected Versions: Not Applicable (n/a)
Exploitation Mechanism
An attacker can exploit this vulnerability by injecting code into a specific file referenced during the device boot process, enabling them to compromise the boot process and maintain persistence.
Mitigation and Prevention
To address CVE-2020-3455, follow these mitigation strategies:
Immediate Steps to Take
- Apply vendor-provided patches or updates promptly.
- Monitor network traffic for signs of exploitation.
- Restrict access to vulnerable systems.
Long-Term Security Practices
- Implement the principle of least privilege for system access.
- Conduct regular security audits and assessments.
- Educate users on security best practices.
Patching and Updates
- Cisco may release patches or updates to address this vulnerability. Stay informed about security advisories and apply patches as soon as they are available.