CVE-2020-8976 Explained : Impact and Mitigation

CVE-2020-8976, also known as ZGR TPS200 Cross-Site Request Forgery (CSRF), was published on September 30, 2022, by INCIBE. The vulnerability affects ZGR TPS200 NG devices with specific firmware and hardware versions.

Understanding CVE-2020-8976

This CVE identifies a critical security flaw that allows remote attackers to execute actions with the permissions of a victim user on ZGR TPS200 NG devices.

What is CVE-2020-8976?

The vulnerability in ZGR TPS200 NG devices enables remote attackers to manipulate actions using a victim user's permissions, provided the victim user has an active session and triggers a malicious request.

The Impact of CVE-2020-8976

The impact of this CVE is critical, with a CVSS v3.1 base score of 9.6, indicating high confidentiality, integrity, and availability impacts.

Technical Details of CVE-2020-8976

ZGR TPS200 NG devices with specific firmware and hardware versions are susceptible to this CSRF vulnerability.

Vulnerability Description

The integrated server of ZGR TPS200 NG, on firmware version 2.00 and hardware version 1.01, allows remote attackers to perform unauthorized actions.

Affected Systems and Versions

Product: ZGR TPS200 NG
Vendor: ZGR
Affected Versions:
2.00 firmware version 2.00
1.01 hardware version 1.01

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Privileges Required: None
User Interaction: Required
Scope: Changed
Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Mitigation and Prevention

Immediate Steps to Take:

Ensure affected devices are not directly exposed to the internet.
Monitor network traffic for any suspicious activity.
Apply vendor-supplied patches or updates promptly. Long-Term Security Practices:
Implement network segmentation to isolate critical devices.
Regularly update and patch all software and firmware.
Conduct security training for users to recognize and report suspicious activities.
Employ strong authentication mechanisms.
Regularly monitor and audit device logs for unusual behavior.
Consider implementing additional security measures such as intrusion detection systems.

Patching and Updates

The ZGR team is developing a new design for the TPS to address the identified vulnerabilities. Affected equipment should be connected to properly isolated and secured networks to mitigate risks.