CVE-2020-3119 : Exploit Details and Defense Strategies

A vulnerability in the Cisco Discovery Protocol implementation for Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to execute arbitrary code or cause a reload on an affected device.

Understanding CVE-2020-3119

This CVE involves a critical vulnerability in Cisco NX-OS Software that could lead to remote code execution.

What is CVE-2020-3119?

The vulnerability stems from improper validation of input in the Cisco Discovery Protocol parser, enabling attackers to send malicious packets and potentially execute code with administrative privileges.

The Impact of CVE-2020-3119

CVSS Base Score: 8.8 (High Severity)
Attack Vector: Adjacent Network
Confidentiality Impact: High
Integrity Impact: High
Availability Impact: High

Technical Details of CVE-2020-3119

This section delves into the specifics of the vulnerability.

Vulnerability Description

The flaw allows an adjacent attacker to exploit the Cisco Discovery Protocol parser's input validation issue, leading to potential code execution.

Affected Systems and Versions

Affected Product: Cisco Unified Computing System (Managed)
Vendor: Cisco
Vulnerable Versions: Less than 9.3(2)

Exploitation Mechanism

Attackers can trigger a stack overflow by sending a crafted Cisco Discovery Protocol packet to the target device, granting them administrative access.

Mitigation and Prevention

Protecting systems from this vulnerability requires immediate action and long-term security measures.

Immediate Steps to Take

Apply vendor-provided patches promptly.
Implement network segmentation to limit broadcast domain exposure.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update and patch all software and firmware.
Conduct security training to educate staff on identifying and responding to potential threats.
Employ network access controls to restrict unauthorized access.

Patching and Updates

Cisco has released patches to address this vulnerability. Ensure timely installation of these updates to mitigate the risk of exploitation.