CVE-2019-12223 : Security Advisory and Response

A vulnerability has been found in Hanwah Techwin SRN-472s 1.07_190502 devices and other SRN-x devices prior to 2019-05-03, allowing attackers to cause a system crash and reboot by inputting a long username.

Understanding CVE-2019-12223

This CVE identifies a buffer overflow vulnerability in the NVR WebViewer of Hanwah Techwin SRN-472s devices, potentially leading to a denial of service condition.

What is CVE-2019-12223?

The vulnerability in Hanwah Techwin SRN-472s devices allows attackers to crash the system and trigger a reboot by submitting a username exceeding 117 characters, exploiting a buffer overflow in the primary process controlling the DVR system.

The Impact of CVE-2019-12223

Attackers can disrupt services and cause temporary unavailability during the reboot process.
Repeated attacks can further impact the device's availability if the attacker has network access.

Technical Details of CVE-2019-12223

This section provides more in-depth technical insights into the vulnerability.

Vulnerability Description

The vulnerability arises from a buffer overflow in the main process of the NVR WebViewer, triggered by submitting a username longer than 117 characters.

Affected Systems and Versions

Hanwah Techwin SRN-472s 1.07_190502 devices
Other SRN-x devices before 2019-05-03

Exploitation Mechanism

By inputting a username exceeding 117 characters, attackers can exploit the buffer overflow to crash the system and initiate a reboot.

Mitigation and Prevention

Protecting systems from CVE-2019-12223 requires immediate actions and long-term security practices.

Immediate Steps to Take

Implement network segmentation to limit access to vulnerable devices.
Monitor network traffic for any suspicious activities targeting the NVR WebViewer.

Long-Term Security Practices

Regularly update firmware and software to patch known vulnerabilities.
Conduct security assessments and penetration testing to identify and address potential weaknesses.

Patching and Updates

Apply patches and updates provided by Hanwah Techwin to address the buffer overflow vulnerability in the NVR WebViewer.