CVE-2017-6030 : What You Need to Know
Discover the security vulnerability in Schneider Electric Modicon PLCs Modicon M221, M241, and M251. Learn about the impact, affected versions, exploitation mechanism, and mitigation steps.
Schneider Electric Modicon PLCs Modicon M221, Modicon M241, and Modicon M251 have a security vulnerability related to Predictable Value Range from Previous Values.
Understanding CVE-2017-6030
This CVE involves a security issue in Schneider Electric Modicon PLCs that could potentially lead to TCP connection spoofing or disruption.
What is CVE-2017-6030?
The vulnerability in Schneider Electric Modicon PLCs allows attackers to predict TCP initial sequence numbers based on previous values, enabling potential spoofing or disruption of TCP connections.
The Impact of CVE-2017-6030
The vulnerability could lead to TCP connection spoofing or disruption, posing a security risk to affected systems.
Technical Details of CVE-2017-6030
Schneider Electric Modicon PLCs are affected by this vulnerability due to insufficiently random TCP initial sequence numbers.
Vulnerability Description
The issue arises from the generation of TCP initial sequence numbers lacking sufficient randomness, allowing attackers to predict sequence numbers based on previous values.
Affected Systems and Versions
- Modicon M221 firmware versions earlier than 1.5.0.0
- Modicon M241 firmware versions earlier than 4.0.5.11
- Modicon M251 firmware versions earlier than 4.0.5.11
Exploitation Mechanism
Attackers can exploit the vulnerability by predicting TCP sequence numbers from previous values, potentially leading to TCP connection spoofing or disruption.
Mitigation and Prevention
Taking immediate steps and implementing long-term security practices are crucial to mitigate the risks associated with CVE-2017-6030.
Immediate Steps to Take
- Update affected Modicon PLCs to versions 1.5.0.0 for Modicon M221, 4.0.5.11 for Modicon M241, and 4.0.5.11 for Modicon M251.
- Monitor network traffic for any suspicious activity.
Long-Term Security Practices
- Regularly update firmware and security patches for Modicon PLCs.
- Implement network segmentation to isolate critical systems.
Patching and Updates
- Schneider Electric has released updated firmware versions to address the vulnerability. Ensure timely installation of these patches to secure the systems.