CVE-2019-15992 : Vulnerability Insights and Analysis

A vulnerability in the Lua interpreter implementation in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated remote attacker to execute code with root privileges on the affected device's Linux operating system.

Understanding CVE-2019-15992

This CVE involves a critical vulnerability in Cisco ASA and FTD Software that could lead to remote code execution.

What is CVE-2019-15992?

The vulnerability arises from insufficient restrictions on Lua function calls in user-supplied Lua scripts, potentially enabling a heap overflow condition and unauthorized code execution with root privileges.

The Impact of CVE-2019-15992

If exploited, an attacker could execute arbitrary code with elevated privileges on the Linux OS of the affected device, posing a severe security risk.

Technical Details of CVE-2019-15992

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The flaw allows an authenticated remote attacker to execute code with root privileges on the device's Linux OS due to inadequate restrictions on Lua function calls.

Affected Systems and Versions

Product: Cisco Adaptive Security Appliance (ASA) Software
Vendor: Cisco
Versions: Not applicable

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Privileges Required: High
User Interaction: None
Scope: Unchanged
CVSS Score: 7.2 (High)
Impact: High confidentiality, integrity, and availability

Mitigation and Prevention

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

Immediate Steps to Take

Apply vendor-provided patches and updates promptly.
Implement network segmentation to limit the attack surface.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update and patch all software and firmware.
Conduct security training for employees to recognize and report potential threats.
Employ intrusion detection and prevention systems.
Follow the principle of least privilege to restrict user access.
Perform regular security audits and assessments.

Patching and Updates

Cisco has released patches to address this vulnerability. Ensure all affected systems are updated with the latest security fixes.