CVE-2023-33012 : Vulnerability Insights and Analysis
Learn about CVE-2023-33012, a high-severity command injection vulnerability in multiple Zyxel firmware versions. Understand the impact, affected systems, and mitigation steps.
A command injection vulnerability in Zyxel firmware versions could allow unauthorized execution of OS commands, posing a high-security risk to affected systems.
Understanding CVE-2023-33012
This CVE involves a command injection vulnerability in multiple Zyxel firmware versions, potentially exploited by LAN-based attackers.
What is CVE-2023-33012?
CVE-2023-33012 is a command injection vulnerability affecting Zyxel ATP series firmware, USG FLEX series firmware, USG FLEX 50(W) series firmware, USG20(W)-VPN series firmware, and VPN series firmware versions 5.00 through 5.36 Patch 2.
The Impact of CVE-2023-33012
The vulnerability could allow unauthenticated attackers to execute OS commands using crafted GRE configurations in LAN environments with cloud management mode enabled. This vulnerability poses a significant security risk to impacted systems.
Technical Details of CVE-2023-33012
This section provides more detailed technical insights into the vulnerability.
Vulnerability Description
The vulnerability stems from a command injection flaw in the configuration parser of the affected Zyxel firmware versions.
Affected Systems and Versions
Zyxel ATP series firmware versions 5.10 through 5.36 Patch 2, USG FLEX series firmware versions 5.00 through 5.36 Patch 2, USG FLEX 50(W) series firmware versions 5.10 through 5.36 Patch 2, USG20(W)-VPN series firmware versions 5.10 through 5.36 Patch 2, and VPN series firmware versions 5.00 through 5.36 Patch 2 are impacted.
Exploitation Mechanism
The vulnerability can be exploited by LAN-based attackers leveraging a crafted GRE configuration when the cloud management mode is enabled on affected systems.
Mitigation and Prevention
To address CVE-2023-33012 and enhance system security, specific steps and practices should be implemented.
Immediate Steps to Take
- Apply security patches provided by Zyxel for the affected firmware versions.
- Disable cloud management mode if not critical for operations.
Long-Term Security Practices
- Regularly update firmware to the latest versions to mitigate known vulnerabilities.
- Implement network segmentation and access controls to limit exposure to potential threats.
Patching and Updates
Continuously monitor security advisories from Zyxel and promptly apply patches to protect systems from emerging threats.