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CVE-2019-5105 : What You Need to Know

Learn about CVE-2019-5105, a memory corruption flaw in 3S-Smart Software Solutions' CODESYS GatewayService, allowing attackers to trigger access violations and process termination. Find mitigation steps and affected systems here.

A vulnerability in the Name Service Client feature of 3S-Smart Software Solutions' CODESYS GatewayService exposes a potential memory corruption flaw, allowing an attacker to trigger an access violation and process termination.

Understanding CVE-2019-5105

This CVE involves a memory corruption vulnerability in CODESYS GatewayService that can be exploited through specially crafted packets.

What is CVE-2019-5105?

        The vulnerability in CODESYS GatewayService can lead to a memory corruption flaw when a specific packet triggers a large memcpy operation, potentially causing an access violation and process termination.

The Impact of CVE-2019-5105

        CVSS Base Score: 7.5 (High)
        Attack Vector: Network
        Attack Complexity: Low
        Privileges Required: None
        Availability Impact: High
        CWE ID: CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer

Technical Details of CVE-2019-5105

This section provides detailed technical information about the vulnerability.

Vulnerability Description

        The vulnerability exists in the Name Service Client functionality of CODESYS GatewayService, allowing an attacker to exploit it through specially crafted packets.

Affected Systems and Versions

        All versions prior to V3.5.16.10 of CODESYS V3 products containing the CmpRouter or CmpRouterEmbedded component are affected.
        Affected systems include various CODESYS Control versions for different devices and operating systems.

Exploitation Mechanism

        An attacker can target devices running GatewayService.exe by sending a specially crafted packet to trigger the vulnerability.

Mitigation and Prevention

Protecting systems from CVE-2019-5105 requires immediate actions and long-term security practices.

Immediate Steps to Take

        Update to version V3.5.16.10 or later of CODESYS V3 products to mitigate the vulnerability.
        Monitor network traffic for any signs of exploitation.

Long-Term Security Practices

        Regularly update software and firmware to patch known vulnerabilities.
        Implement network segmentation and access controls to limit the attack surface.

Patching and Updates

        Apply patches and updates provided by 3S-Smart Software Solutions to address the vulnerability.

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