CVE-2020-3513 : Security Advisory and Response

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

Understanding CVE-2020-3513

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

What is CVE-2020-3513?

The vulnerabilities in Cisco IOS XE Software for Cisco ASR 900 Series Routers with RSP3 could be exploited by an authenticated, local attacker to run arbitrary code with root privileges.

The Impact of CVE-2020-3513

The vulnerabilities could lead to an attacker executing persistent code at bootup, compromising the chain of trust and gaining root access to the underlying OS.

Technical Details of CVE-2020-3513

Vulnerability Description

Incorrect validations in boot scripts allow setting specific ROM monitor variables, enabling an attacker to run arbitrary code.

Affected Systems and Versions

Product: Cisco IOS XE Software
Vendor: Cisco
Versions: Not applicable

Exploitation Mechanism

Attacker needs high privileges and access to the root shell or physical device to exploit the vulnerabilities.

Mitigation and Prevention

Immediate Steps to Take

Apply vendor-provided patches promptly.
Restrict physical access to devices.

Long-Term Security Practices

Regularly update and patch systems.
Implement least privilege access controls.

Patching and Updates

Refer to the vendor's security advisory for patching instructions.