CVE-2019-15800 : What You Need to Know

A vulnerability has been identified in Zyxel GS1900 devices running firmware versions prior to 2.50(AAHH.0)C0, allowing attackers to execute unauthorized commands on the switches.

Understanding CVE-2019-15800

This CVE involves a lack of input validation in specific functions within the firmware, potentially enabling unauthorized code execution.

What is CVE-2019-15800?

The vulnerability arises from the absence of input validation in certain functions within the libclicmd.so library, which could be exploited by attackers to execute unauthorized commands on the switches.

The Impact of CVE-2019-15800

This vulnerability could allow attackers to exploit the affected functions and execute unauthorized commands on the switches, potentially leading to a security breach.

Technical Details of CVE-2019-15800

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The issue stems from the lack of input validation in cmd_sys_traceroute_exec(), cmd_sys_arp_clear(), and cmd_sys_ping_exec() functions within the libclicmd.so library in the firmware.

Affected Systems and Versions

Zyxel GS1900 devices running firmware versions prior to 2.50(AAHH.0)C0

Exploitation Mechanism

Attackers can exploit the vulnerable functions to execute unauthorized commands on the switches by invoking system()
Although these functions are not currently utilized in the mentioned firmware version, attackers could potentially exploit other vulnerabilities to eventually exploit these specific vulnerabilities.

Mitigation and Prevention

Protecting systems from CVE-2019-15800 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Zyxel GS1900 devices to firmware version 2.50(AAHH.0)C0 or later
Monitor network traffic for any suspicious activities

Long-Term Security Practices

Regularly update firmware and security patches
Implement network segmentation to limit the impact of potential attacks

Patching and Updates

Apply patches and updates provided by Zyxel to address the vulnerability