CVE-2020-3416 Explained : Impact and Mitigation

Cisco IOS XE Software for Cisco ASR 900 Series Route Switch Processor 3 Arbitrary Code Execution Vulnerabilities

Understanding CVE-2020-3416

Multiple vulnerabilities in the initialization routines of Cisco IOS XE Software could allow an attacker to execute persistent code at bootup.

What is CVE-2020-3416?

Vulnerabilities in bootup routines of Cisco IOS XE Software for Cisco ASR 900 Series Routers
Allows an attacker with high privileges to execute persistent code at bootup

The Impact of CVE-2020-3416

Attack complexity: Low
Attack vector: Local
High impact on availability, confidentiality, and integrity
Requires high privileges and no user interaction

Technical Details of CVE-2020-3416

Vulnerability details and affected systems

Vulnerability Description

Incorrect validations in boot scripts when specific ROM monitor variables are set
Attacker can exploit by copying a file to the device and defining ROMMON variables
Successful exploit grants attacker root privileges on the OS

Affected Systems and Versions

Product: Cisco IOS XE Software
Vendor: Cisco
Affected version: n/a

Exploitation Mechanism

Attacker needs root shell access or physical access to device

Mitigation and Prevention

Protecting against CVE-2020-3416

Immediate Steps to Take

Apply vendor patches and updates promptly
Restrict physical access to devices
Monitor for unauthorized access or changes

Long-Term Security Practices

Regularly update and patch software
Implement strong access controls and authentication mechanisms
Conduct security training and awareness programs

Patching and Updates

Refer to the vendor's security advisory for patching instructions