CVE-2019-13933 : Security Advisory and Response

A security flaw has been discovered in various SCALANCE X series devices, allowing unauthorized access bypass. This vulnerability affects multiple Siemens products.

Understanding CVE-2019-13933

This CVE identifies a critical security vulnerability in Siemens SCALANCE X series devices that could be exploited by attackers to bypass access controls.

What is CVE-2019-13933?

The vulnerability in SCALANCE X series devices allows unauthorized individuals to bypass access controls by sending a specific GET request to a URL on the device's web configuration interface. This could lead to unauthorized access to sensitive information or device settings.

The Impact of CVE-2019-13933

If exploited, attackers with network access could potentially gain unauthorized access to sensitive information or manipulate device configurations. As of the advisory publication, no public exploitation instances have been reported.

Technical Details of CVE-2019-13933

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability allows unauthorized individuals to bypass access controls on SCALANCE X series devices by sending a GET request to a specific URL on the device's web configuration interface.

Affected Systems and Versions

Multiple Siemens SCALANCE X series devices are affected by this vulnerability, including SCALANCE X204RNA, SCALANCE X302-7 EEC, SCALANCE X304-2FE, and many others. Versions below specific thresholds are impacted.

Exploitation Mechanism

Exploiting this vulnerability involves sending a GET request to a particular URL on the device's web configuration interface, enabling unauthorized access to sensitive information or device settings.

Mitigation and Prevention

To address CVE-2019-13933, immediate steps and long-term security practices are crucial.

Immediate Steps to Take

Apply patches or updates provided by Siemens promptly.
Implement network segmentation to limit access to vulnerable devices.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update and patch all network-connected devices.
Conduct security assessments and penetration testing to identify vulnerabilities.
Educate employees on cybersecurity best practices to prevent unauthorized access.

Patching and Updates

Siemens has released patches to address the vulnerability. Ensure all affected SCALANCE X series devices are updated to versions that mitigate the security flaw.