CVE-2020-3423 : Security Advisory and Response

A vulnerability in the Lua interpreter integrated in Cisco IOS XE Software allows an attacker to execute arbitrary code with root privileges. Learn about the impact, technical details, and mitigation steps.

Understanding CVE-2020-3423

This CVE involves a critical vulnerability in Cisco IOS XE Software that could lead to arbitrary code execution with elevated privileges.

What is CVE-2020-3423?

The vulnerability stems from insufficient restrictions on Lua function calls within user-supplied scripts, enabling an attacker to exploit the system.

The Impact of CVE-2020-3423

The vulnerability allows an authenticated local attacker to execute arbitrary code with root privileges on the underlying Linux OS of the affected device.

Technical Details of CVE-2020-3423

This section provides a deeper dive into the technical aspects of the vulnerability.

Vulnerability Description

The flaw in the Lua interpreter implementation allows attackers to trigger a buffer overflow condition by submitting a malicious Lua script, leading to arbitrary code execution.

Affected Systems and Versions

Product: Cisco IOS XE Software 3.7.0S
Vendor: Cisco
Version: n/a

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Local
Privileges Required: High
Integrity Impact: High
Confidentiality Impact: Low
Scope: Unchanged

Mitigation and Prevention

Protect your systems from CVE-2020-3423 with these mitigation strategies.

Immediate Steps to Take

Apply vendor patches promptly
Restrict access to administrative credentials
Monitor and analyze Lua script executions

Long-Term Security Practices

Regular security training for administrators
Implement least privilege access controls
Conduct regular security assessments

Patching and Updates

Stay informed about security advisories
Implement a robust patch management process