CVE-2021-33532 : Vulnerability Insights and Analysis

Industrial WLAN devices manufactured by Weidmüller are affected by an OS Command Injection vulnerability. This vulnerability allows an attacker to execute remote commands on the device, leading to potential device control.

Understanding CVE-2021-33532

CVE-2021-33532 is a command injection vulnerability found in Weidmüller Industrial WLAN devices, enabling unauthorized remote command execution.

What is CVE-2021-33532?

In Weidmüller Industrial WLAN devices, a command injection vulnerability exists in the iw_webs functionality. By exploiting a specially crafted diagnostic script file name, an attacker can manipulate user input, leading to remote control over the device.

The Impact of CVE-2021-33532

The vulnerability has a CVSS base score of 8.8, indicating a high severity level. It poses a significant threat to confidentiality, integrity, and availability as it allows remote control by executing commands.

Technical Details of CVE-2021-33532

The vulnerability is classified under CWE-78 - OS Command Injection.

Vulnerability Description

An attacker can leverage a crafted script file name to inject commands, gaining unauthorized access and control over the affected WLAN devices.

Affected Systems and Versions

Weidmüller Industrial WLAN devices versions IE-WL(T)-BL-AP-CL-XX and IE-WL(T)-VL-AP-CL-XX are impacted.

Exploitation Mechanism

By sending malicious commands while authenticated as a low privilege user, an attacker can exploit the vulnerability, potentially compromising the device.

Mitigation and Prevention

To address CVE-2021-33532, users must take immediate actions and adopt long-term security best practices.

Immediate Steps to Take

Apply the provided patches:

For IE-WL(T)-BL-AP-CL-XX: Versions V1.16.21 (Build 21010513) and above are secure.
For IE-WL(T)-VL-AP-CL-XX: Versions V1.11.13 (Build 21010513) and above are secure.

Long-Term Security Practices

Regularly update and patch Weidmüller Industrial WLAN devices to prevent known vulnerabilities.

Patching and Updates

Ensure timely installation of security patches to safeguard against potential threats and exploits.