CVE-2023-33011 Explained : Impact and Mitigation
Discover the format string vulnerability in Zyxel ATP series firmware 5.10-5.36 Patch 2, USG FLEX series firmware 5.00-5.36 Patch 2, and more allowing unauthorized OS command execution.
A format string vulnerability in Zyxel ATP series firmware, USG FLEX series firmware, USG FLEX 50(W) series firmware, USG20(W)-VPN series firmware, and VPN series firmware could allow unauthorized OS command execution by an attacker.
Understanding CVE-2023-33011
This vulnerability affects various Zyxel firmware versions, potentially enabling LAN-based attackers to execute malicious commands.
What is CVE-2023-33011?
CVE-2023-33011 is a format string vulnerability present in Zyxel ATP series firmware, USG FLEX series firmware, USG FLEX 50(W) series firmware, USG20(W)-VPN series firmware, and VPN series firmware versions.
The Impact of CVE-2023-33011
The vulnerability could allow an unauthenticated attacker on the local network to execute OS commands by exploiting a crafted PPPoE configuration, specifically when cloud management mode is active.
Technical Details of CVE-2023-33011
This section provides in-depth technical details about the vulnerability.
Vulnerability Description
The format string vulnerability in affected Zyxel firmware versions could permit attackers to execute OS commands.
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
Attackers can exploit the vulnerability by utilizing a crafted PPPoE configuration on an affected device with the cloud management mode enabled.
Mitigation and Prevention
Learn how to address and prevent the CVE-2023-33011 vulnerability.
Immediate Steps to Take
Immediately disable cloud management mode if possible and apply vendor-supplied patches or workarounds.
Long-Term Security Practices
Regularly update firmware, conduct security assessments, and monitor network traffic for any suspicious activities.
Patching and Updates
Stay informed about security advisories from Zyxel and apply patches promptly to protect your systems.