CVE-2019-9590 : What You Need to Know

A vulnerability was found in TENGCONTROL T-920 PLC v5.5 devices, allowing remote attackers to trigger a denial of service by sending specific requests to TCP port 502.

Understanding CVE-2019-9590

This CVE entry describes a vulnerability in TENGCONTROL T-920 PLC v5.5 devices that can be exploited remotely to cause a denial of service.

What is CVE-2019-9590?

The vulnerability in TENGCONTROL T-920 PLC v5.5 devices allows remote attackers to induce a persistent failure mode, resulting in a denial of service condition. This occurs when a sequence of specific requests is sent to TCP port 502.

The Impact of CVE-2019-9590

Exploitation of this vulnerability can lead to a denial of service, disrupting the normal operation of the affected devices and potentially causing downtime or service unavailability.

Technical Details of CVE-2019-9590

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability enables remote attackers to trigger a persistent failure mode on TENGCONTROL T-920 PLC v5.5 devices by sending a specific sequence of requests to TCP port 502.

Affected Systems and Versions

Affected Systems: TENGCONTROL T-920 PLC v5.5 devices
Affected Versions: Not specified

Exploitation Mechanism

The exploitation involves sending a series of specific requests (UID 0x43) to TCP port 502, which triggers the denial of service condition.

Mitigation and Prevention

To address CVE-2019-9590, follow these mitigation strategies:

Immediate Steps to Take

Implement firewall rules to restrict access to TCP port 502
Monitor network traffic for any suspicious activity targeting the affected devices

Long-Term Security Practices

Regularly update and patch the firmware of TENGCONTROL T-920 PLC devices
Conduct security assessments and penetration testing to identify and address vulnerabilities

Patching and Updates

Apply patches and updates provided by the vendor to mitigate the vulnerability and enhance device security