CVE-2021-33530 : What You Need to Know

This CVE article discusses a critical OS Command Injection vulnerability in Weidmueller Industrial WLAN devices that allows remote attackers to execute arbitrary commands, potentially leading to full control over affected devices.

Understanding CVE-2021-33530

This section provides an in-depth analysis of the vulnerability affecting Weidmueller Industrial WLAN devices.

What is CVE-2021-33530?

A command injection vulnerability exists in encrypted diagnostic script functionality of Weidmueller Industrial WLAN devices. By exploiting this flaw, an attacker can execute malicious commands through specially crafted diagnostic script files, enabling remote unauthorized access.

The Impact of CVE-2021-33530

The vulnerability poses a high-risk threat with a CVSS base score of 8.8, potentially resulting in unauthorized access, data integrity compromise, and disruption of service availability.

Technical Details of CVE-2021-33530

This section delves into the technical aspects of the CVE, including the vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability allows an attacker to inject and execute arbitrary busybox commands through malicious diagnostic script files, granting unauthorized remote control over the affected devices.

Affected Systems and Versions

Multiple versions of Weidmueller Industrial WLAN devices are affected, including IE-WL(T)-BL-AP-CL-XX and IE-WL(T)-VL-AP-CL-XX, up to specific build numbers.

Exploitation Mechanism

An attacker can exploit the vulnerability by sending a specially crafted diagnostic script file while authenticated as a low privilege user, triggering the command injection flaw and gaining remote control.

Mitigation and Prevention

This section outlines the necessary steps to mitigate the risks associated with CVE-2021-33530 and prevent potential exploitation.

Immediate Steps to Take

Users of affected devices should apply the provided patches immediately to secure their systems against potential exploits.

Long-Term Security Practices

Implementing robust network security measures, restricting access to diagnostic functionalities, and conducting regular security audits can enhance the overall security posture.

Patching and Updates

Weidmueller has released patches for the affected versions: V1.16.21 (Build 21010513) for IE-WL(T)-BL-AP-CL-XX, and V1.11.13 (Build 21010513) for IE-WL(T)-VL-AP-CL-XX to address the vulnerability.