CVE-2019-3951 Explained : Impact and Mitigation

Advantech WebAccess/SCADA versions prior to 8.4.3 are vulnerable to a stack-based buffer overflow, allowing remote attackers to execute arbitrary code or launch denial of service attacks.

Understanding CVE-2019-3951

An overview of the vulnerability and its impact.

What is CVE-2019-3951?

This CVE describes a stack-based buffer overflow vulnerability in Advantech WebAccess versions before 8.4.3, enabling unauthorized remote attackers to manipulate IOCTL 70533 RPC messages without authentication, leading to arbitrary code execution or denial of service.

The Impact of CVE-2019-3951

The vulnerability poses a significant risk as attackers can exploit it to execute malicious code or disrupt services, potentially causing severe damage to affected systems.

Technical Details of CVE-2019-3951

Insight into the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability in Advantech WebAccess allows unauthenticated remote attackers to trigger a stack-based buffer overflow by handling IOCTL 70533 RPC messages, resulting in memory corruption and the execution of arbitrary code.

Affected Systems and Versions

Product: Advantech WebAccess/SCADA
Version: 8.4.2

Exploitation Mechanism

Attackers exploit the vulnerability by sending specially crafted IOCTL 70533 RPC messages to the target system, triggering the stack-based buffer overflow.

Mitigation and Prevention

Measures to address and prevent the CVE-2019-3951 vulnerability.

Immediate Steps to Take

Update Advantech WebAccess to version 8.4.3 or later to mitigate the vulnerability.
Implement network segmentation to limit exposure of vulnerable systems.

Long-Term Security Practices

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

Patching and Updates

Apply security patches and updates provided by Advantech promptly to ensure system security and protect against known vulnerabilities.