CVE-2020-7536 Explained : Impact and Mitigation
Learn about CVE-2020-7536, a CWE-754 vulnerability in Modicon M340 CPUs and Communication Ethernet modules, potentially causing devices to be unreachable during SNMP network parameter modifications. Find mitigation steps and long-term security practices.
A CWE-754 vulnerability exists in Modicon M340 CPUs and Communication Ethernet modules, potentially causing devices to be unreachable when modifying network parameters over SNMP.
Understanding CVE-2020-7536
This CVE involves an Improper Check for Unusual or Exceptional Conditions vulnerability in specific Schneider Electric products.
What is CVE-2020-7536?
The vulnerability in Modicon M340 CPUs and Communication Ethernet modules could lead to devices becoming unreachable during SNMP network parameter modifications.
The Impact of CVE-2020-7536
The vulnerability could result in denial of service, making the affected devices inaccessible for network management and control.
Technical Details of CVE-2020-7536
This section provides detailed technical information about the CVE.
Vulnerability Description
The CWE-754 vulnerability allows attackers to disrupt network connectivity by exploiting improper checks in the affected Schneider Electric products.
Affected Systems and Versions
- Modicon M340 CPUs (BMXP34* versions prior to V3.30)
- Modicon M340 Communication Ethernet modules (BMXNOE0100 (H) versions prior to V3.4, BMXNOE0110 (H) versions prior to V6.6, and BMXNOR0200H all versions)
Exploitation Mechanism
Attackers can exploit this vulnerability by sending specially crafted SNMP packets to the affected devices, causing them to become unreachable.
Mitigation and Prevention
Protecting systems from CVE-2020-7536 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply vendor-supplied patches or updates to mitigate the vulnerability.
- Implement network segmentation to limit the impact of potential attacks.
- Monitor network traffic for any suspicious SNMP activities.
Long-Term Security Practices
- Regularly update and patch all software and firmware in the network.
- Conduct security assessments and penetration testing to identify and address vulnerabilities.
Patching and Updates
- Schneider Electric may release patches or updates to address the CWE-754 vulnerability.