CVE-2022-45440 : What You Need to Know
Learn about CVE-2022-45440, a vulnerability in Zyxel AX7501-B0 firmware FTP server allowing local attackers to access the root file system via symbolic links. Find mitigation steps here.
A vulnerability exists in the FTP server of the Zyxel AX7501-B0 firmware prior to V5.17(ABPC.3)C0, allowing a local authenticated attacker to access the root file system. This CVE was published on January 17, 2023, by Zyxel.
Understanding CVE-2022-45440
This section provides an overview of the vulnerability, its impact, technical details, and mitigation strategies.
What is CVE-2022-45440?
CVE-2022-45440 is a vulnerability in the FTP server of Zyxel AX7501-B0 firmware that enables a local attacker with admin privileges to exploit symbolic links on external storage.
The Impact of CVE-2022-45440
The vulnerability could be abused by an attacker to access the root file system by creating a symbolic link on external storage media and logging into the FTP server of a vulnerable Zyxel device.
Technical Details of CVE-2022-45440
This section explores the specifics of the vulnerability, including its description, affected systems, versions, and exploitation mechanism.
Vulnerability Description
The vulnerability in the FTP server of Zyxel AX7501-B0 firmware enables a local authenticated attacker with admin privileges to access the root file system by manipulating symbolic links on external storage.
Affected Systems and Versions
The Zyxel AX7501-B0 firmware versions prior to V5.17(ABPC.3)C0 are impacted by this vulnerability.
Exploitation Mechanism
A local authenticated attacker can abuse the vulnerability by creating a symbolic link on external storage media, like a USB flash drive, and then logging into the FTP server on the affected device.
Mitigation and Prevention
This section outlines the steps to mitigate the impact of CVE-2022-45440 and preventive measures to enhance system security.
Immediate Steps to Take
Users should update the Zyxel AX7501-B0 firmware to version V5.17(ABPC.3)C0 or higher to remediate the vulnerability. Additionally, restrict access to sensitive systems and services.
Long-Term Security Practices
Implement strong authentication and authorization controls, regularly monitor system logs for suspicious activities, and educate users about safe browsing practices to prevent future attacks.
Patching and Updates
Stay informed about security advisories from Zyxel and promptly apply security patches and updates to address known vulnerabilities.