CVE-2021-35031 Explained : Impact and Mitigation
Learn about CVE-2021-35031 affecting Zyxel GS1900 series firmware, XGS1210 series firmware, and XGS1250 series firmware. Find out its impact, technical details, and mitigation steps.
A vulnerability in the TFTP client of Zyxel GS1900 series firmware, XGS1210 series firmware, and XGS1250 series firmware could allow an authenticated LAN user to execute arbitrary OS commands via the GUI of the vulnerable device.
Understanding CVE-2021-35031
This CVE impacts Zyxel GS1900 series firmware, XGS1210 series firmware, and XGS1250 series firmware, potentially enabling unauthorized OS command execution.
What is CVE-2021-35031?
The CVE-2021-35031 vulnerability affects Zyxel networking devices by allowing authenticated LAN users to execute malicious OS commands through the vulnerable device's GUI.
The Impact of CVE-2021-35031
With a CVSS base score of 6.8, this medium-severity vulnerability poses a high risk to confidentiality, integrity, and availability, especially for affected Zyxel network switches.
Technical Details of CVE-2021-35031
The vulnerability lies in the TFTP client of Zyxel GS1900 series firmware, XGS1210 series firmware, and XGS1250 series firmware.
Vulnerability Description
The flaw enables authenticated LAN users to carry out unauthorized OS commands through the device GUI, potentially leading to system compromise.
Affected Systems and Versions
- GS1900 series firmware version 2.60
- XGS1210 series firmware version 1.00(ABTY.4)C0
- XGS1250 series firmware version 1.00(ABWE.0)C0
Exploitation Mechanism
The vulnerability allows attackers to exploit the TFTP client to inject and execute arbitrary OS commands, compromising device security.
Mitigation and Prevention
To address CVE-2021-35031, immediate actions and long-term security practices are crucial.
Immediate Steps to Take
- Implement security updates provided by Zyxel promptly.
- Restrict GUI access to authenticated and authorized personnel only.
Long-Term Security Practices
- Regularly monitor for security advisories from Zyxel.
- Conduct routine security assessments and penetration testing.
Patching and Updates
- Apply firmware patches and updates from Zyxel to remediate the vulnerability and enhance device security.