CVE-2019-13945 : What You Need to Know
Discover the security flaw in Siemens SIMATIC S7-1200 CPU family and S7-200 SMART CPU models. Learn about the impact, affected systems, exploitation mechanism, and mitigation steps for CVE-2019-13945.
A security flaw has been discovered in various versions of the SIMATIC S7-1200 CPU family (including SIPLUS variants) and specific versions of SIMATIC S7-200 SMART CPU models. The vulnerability allows additional diagnostic functionality during the manufacturing process and can be exploited by an attacker with physical access to the UART interface during boot.
Understanding CVE-2019-13945
This CVE identifies a vulnerability in Siemens AG's SIMATIC S7-1200 CPU family and specific SIMATIC S7-200 SMART CPU models.
What is CVE-2019-13945?
The vulnerability in CVE-2019-13945 allows unauthorized access to additional diagnostic functionality in affected Siemens devices.
The Impact of CVE-2019-13945
The flaw can be exploited by attackers with physical access to the UART interface during the boot process of the affected devices.
Technical Details of CVE-2019-13945
This section provides technical details of the vulnerability.
Vulnerability Description
The vulnerability allows unauthorized access to additional diagnostic functionality during the manufacturing process of the affected Siemens devices.
Affected Systems and Versions
- SIMATIC S7-1200 CPU family (incl. SIPLUS variants): All versions
- SIMATIC S7-1200 CPU family < V4.x (incl. SIPLUS variants): All versions
- SIMATIC S7-1200 CPU family V4.x (incl. SIPLUS variants): All versions with Function State (FS) < 11
- SIMATIC S7-200 SMART CPU models: Various versions with specific Function State (FS) limitations
Exploitation Mechanism
The vulnerability can be exploited by an attacker with physical access to the UART interface during the boot process of the affected Siemens devices.
Mitigation and Prevention
Protecting systems from CVE-2019-13945 is crucial for maintaining security.
Immediate Steps to Take
- Implement physical security measures to restrict access to the UART interface during the boot process.
- Regularly monitor and audit physical access to the affected devices.
Long-Term Security Practices
- Conduct regular security training for personnel handling the affected devices.
- Keep firmware and software up to date to mitigate known vulnerabilities.
Patching and Updates
- Apply patches and updates provided by Siemens to address the vulnerability in the affected devices.