CVE-2019-5143 : Security Advisory and Response

The Moxa AWK-3131A firmware version 1.13 contains a critical vulnerability that can lead to remote code execution through a format string vulnerability.

Understanding CVE-2019-5143

This CVE involves a buffer overflow vulnerability in the iw_console conio_writestr function of Moxa AWK-3131A firmware version 1.13.

What is CVE-2019-5143?

The vulnerability in the Moxa AWK-3131A firmware version 1.13 allows attackers to execute remote code by exploiting a format string vulnerability.

The Impact of CVE-2019-5143

The impact of this vulnerability is rated as high, with a CVSS base score of 8.8. It can result in unauthorized remote code execution with high confidentiality, integrity, and availability impacts.

Technical Details of CVE-2019-5143

The technical details of this CVE provide insight into the vulnerability and affected systems.

Vulnerability Description

The vulnerability arises from a flaw in the iw_console conio_writestr function, allowing attackers to trigger a buffer overflow by introducing a specially crafted time server entry.

Affected Systems and Versions

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

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Privileges Required: Low
User Interaction: None
Scope: Unchanged
Exploitation can be achieved by sending commands as a low-privileged authenticated user.

Mitigation and Prevention

Protecting systems from CVE-2019-5143 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor-supplied patches promptly.
Implement network segmentation to limit the impact of potential attacks.
Monitor network traffic for any suspicious activities.

Long-Term Security Practices

Regularly update firmware and software to patch known vulnerabilities.
Conduct security assessments and penetration testing to identify and address weaknesses.
Educate users on best practices for cybersecurity awareness.
Implement strong access controls and authentication mechanisms.

Patching and Updates

Regularly check for updates and patches provided by Moxa to address the vulnerability in the affected firmware version.