CVE-2020-3407 : Vulnerability Insights and Analysis

A vulnerability in the RESTCONF and NETCONF-YANG access control list (ACL) function of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the device to reload. The vulnerability is due to incorrect processing of the ACL that is tied to the RESTCONF or NETCONF-YANG feature. An attacker could exploit this vulnerability by accessing the device using RESTCONF or NETCONF-YANG. A successful exploit could allow an attacker to cause the device to reload, resulting in a denial of service (DoS) condition.

Understanding CVE-2020-3407

This CVE involves a denial of service vulnerability in Cisco IOS XE Software due to issues in ACL processing.

What is CVE-2020-3407?

The vulnerability in the RESTCONF and NETCONF-YANG ACL function of Cisco IOS XE Software allows a remote attacker to trigger a device reload, leading to a denial of service.

The Impact of CVE-2020-3407

The vulnerability poses a high availability impact, with a CVSS base score of 8.6, indicating a significant threat to affected systems.

Technical Details of CVE-2020-3407

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

Vulnerability Type: Denial of Service (DoS)
CWE ID: CWE-476

Affected Systems and Versions

Product: Cisco IOS XE Software
Vendor: Cisco
Affected Version: Not Applicable (n/a)

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Privileges Required: None
User Interaction: None
Scope: Changed
Vector String: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Mitigation and Prevention

Protecting systems from CVE-2020-3407 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor patches or updates promptly
Monitor network traffic for any suspicious activity
Restrict access to vulnerable services

Long-Term Security Practices

Regularly update and patch software and firmware
Implement network segmentation to limit the impact of potential attacks
Conduct security assessments and audits periodically

Patching and Updates

Refer to the vendor advisory for specific patch details and instructions