CVE-2019-5153 : Security Advisory and Response

The Moxa AWK-3131A firmware version 1.13 contains a critical vulnerability that allows remote code execution through the iw_webs configuration parsing feature.

Understanding CVE-2019-5153

This CVE involves a stack-based buffer overflow vulnerability in the Moxa AWK-3131A firmware version 1.13, enabling attackers to execute code remotely.

What is CVE-2019-5153?

The vulnerability in the Moxa AWK-3131A firmware version 1.13 allows an attacker to trigger remote code execution by overflowing an error message buffer with a specially crafted user name.

The Impact of CVE-2019-5153

CVSS Base Score: 9.9 (Critical)
Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
Confidentiality Impact: High
Integrity Impact: High
Availability Impact: High
Scope: Changed
User Interaction: None

Technical Details of CVE-2019-5153

The technical details of the vulnerability in the Moxa AWK-3131A firmware version 1.13.

Vulnerability Description

The vulnerability arises from a flaw in the iw_webs configuration parsing feature, allowing an attacker to execute code remotely by overflowing an error message buffer.

Affected Systems and Versions

Affected Product: Moxa
Affected Version: Moxa AWK-3131A Firmware version 1.13

Exploitation Mechanism

The vulnerability can be exploited by an authenticated low privilege user who sends specific commands to trigger the buffer overflow and execute code remotely.

Mitigation and Prevention

Steps to mitigate and prevent exploitation of CVE-2019-5153.

Immediate Steps to Take

Update to a patched version of the firmware if available.
Implement network segmentation to limit exposure.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update firmware and software to patch known vulnerabilities.
Conduct security training for users to recognize and report suspicious activities.

Patching and Updates

Apply patches and updates provided by the vendor to address the vulnerability.