CVE-2020-3476 Explained : Impact and Mitigation

A vulnerability in the CLI implementation of a specific command of Cisco IOS XE Software could allow an authenticated, local attacker to overwrite arbitrary files in the underlying host file system.

Understanding CVE-2020-3476

This CVE involves a security flaw in Cisco IOS XE Software that enables a local attacker to manipulate files on the host system.

What is CVE-2020-3476?

The vulnerability arises from inadequate validation of specific CLI command parameters, allowing attackers to overwrite files on the host system by exploiting this flaw.

The Impact of CVE-2020-3476

The vulnerability poses a medium severity risk with a CVSS base score of 4.4. If successfully exploited, it could lead to the unauthorized modification of arbitrary files on the host system.

Technical Details of CVE-2020-3476

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability in Cisco IOS XE Software allows authenticated local attackers to overwrite files on the host system by manipulating CLI command parameters.

Affected Systems and Versions

Product: Cisco IOS XE Software
Vendor: Cisco
Affected Version: Not applicable

Exploitation Mechanism

Attackers can exploit this vulnerability by issuing a specific CLI command with malicious parameters, enabling them to overwrite any file on the host system.

Mitigation and Prevention

Protecting systems from CVE-2020-3476 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor-provided patches or updates promptly to mitigate the vulnerability.
Monitor system logs for any suspicious file modifications.

Long-Term Security Practices

Implement the principle of least privilege to restrict unnecessary access rights.
Conduct regular security audits and assessments to identify and address vulnerabilities proactively.

Patching and Updates

Regularly check for security advisories from Cisco and apply patches or updates to ensure system security.