CVE-2018-7833 : Security Advisory and Response
Learn about CVE-2018-7833, an Improper Check for Unusual or Exceptional Conditions vulnerability in Schneider Electric SE's embedded web servers, allowing unauthorized disruption. Find mitigation steps and prevention measures here.
A security weakness in the embedded web servers of Modicon M340, Premium, Quantum PLCs, and BMXNOR0200 devices allows unauthorized users to disrupt the server's functionality.
Understanding CVE-2018-7833
This CVE identifies an Improper Check for Unusual or Exceptional Conditions vulnerability in Schneider Electric SE's embedded web servers.
What is CVE-2018-7833?
This vulnerability enables unauthorized users to disrupt the web server's functionality by sending specially crafted XML data through a POST request.
The Impact of CVE-2018-7833
- Unauthorized users can cause the web server to become unavailable.
Technical Details of CVE-2018-7833
This section provides detailed technical information about the vulnerability.
Vulnerability Description
The vulnerability lies in the embedded web servers of Modicon M340, Premium, Quantum PLCs, and BMXNOR0200 devices, allowing unauthenticated users to disrupt the server's functionality.
Affected Systems and Versions
- Product: Embedded Web Servers in all Modicon M340, Premium, Quantum PLCs, and BMXNOR0200
- Vendor: Schneider Electric SE
- Affected Version: Embedded Web Servers in all Modicon M340, Premium, Quantum PLCs, and BMXNOR0200
Exploitation Mechanism
Unauthorized users exploit this vulnerability by sending carefully crafted XML data through a POST request to disrupt the web server.
Mitigation and Prevention
Protecting systems from CVE-2018-7833 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply security patches provided by Schneider Electric SE.
- Monitor network traffic for any suspicious activities.
- Restrict access to the web servers to authorized personnel only.
Long-Term Security Practices
- Regularly update and patch all PLC devices.
- Implement network segmentation to isolate critical systems.
- Conduct regular security audits and penetration testing.
Patching and Updates
- Stay informed about security updates from Schneider Electric SE.
- Apply patches promptly to mitigate the vulnerability.