CVE-2021-33023 : Security Advisory and Response

Advantech WebAccess versions 9.02 and prior are vulnerable to a heap-based buffer overflow, potentially enabling remote code execution.

Understanding CVE-2021-33023

This CVE relates to a critical vulnerability in Advantech WebAccess software, allowing attackers to exploit a heap-based buffer overflow.

What is CVE-2021-33023?

CVE-2021-33023 pertains to a security flaw in Advantech WebAccess versions 9.02 and below, which could be abused by threat actors to execute code remotely.

The Impact of CVE-2021-33023

The heap-based buffer overflow issue poses a critical risk, as attackers can capitalize on it to compromise affected systems, resulting in unauthorized remote code execution.

Technical Details of CVE-2021-33023

This section covers the technical aspects of CVE-2021-33023.

Vulnerability Description

The vulnerability in Advantech WebAccess arises from a heap-based buffer overflow, offering a potential entry point for threat actors to achieve remote code execution.

Affected Systems and Versions

Advantech WebAccess software versions 9.02 and prior are susceptible to this vulnerability, putting users of these versions at risk of exploitation.

Exploitation Mechanism

Exploiting this vulnerability involves triggering a heap-based buffer overflow, which can be leveraged by threat actors to remotely execute malicious code.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-33023, users are advised to take immediate action.

Immediate Steps to Take

Advantech recommends adding a remote access code to avert exploitation, ensuring that the code matches during installation on the OPC Server to prevent unauthorized access.

Long-Term Security Practices

For enhanced security, users should regularly update the software, implement access controls, and conduct security assessments to detect and address vulnerabilities.

Patching and Updates

Users can address the heap-based buffer overflow vulnerability by re-installing the Advantech WebAccess SCADA software on the OPC Server node or editing the BWSERVER.INI file to align with the database.