CVE-2020-15803 : Security Advisory and Response

CVE-2020-15803 is a vulnerability found in Zabbix versions before 3.0.32rc1, 4.x before 4.0.22rc1, 4.1.x through 4.4.x before 4.4.10rc1, and 5.x before 5.0.2rc1, allowing stored XSS in the URL Widget.

Understanding CVE-2020-15803

This CVE identifies a specific vulnerability in Zabbix software that could lead to stored cross-site scripting (XSS) attacks through the URL Widget.

What is CVE-2020-15803?

CVE-2020-15803 is a security flaw in Zabbix versions prior to specified releases that enables malicious actors to execute stored XSS attacks via the URL Widget.

The Impact of CVE-2020-15803

The vulnerability could be exploited by attackers to inject malicious scripts into the URL Widget, potentially leading to unauthorized access, data theft, or further compromise of the affected systems.

Technical Details of CVE-2020-15803

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability in Zabbix versions before the specified releases allows for the storage of malicious scripts in the URL Widget, opening the door to XSS attacks.

Affected Systems and Versions

Zabbix versions before 3.0.32rc1
Zabbix 4.x before 4.0.22rc1
Zabbix 4.1.x through 4.4.x before 4.4.10rc1
Zabbix 5.x before 5.0.2rc1

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting malicious scripts into the URL Widget, which, when executed, can compromise the security of the system.

Mitigation and Prevention

Protecting systems from CVE-2020-15803 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Zabbix to versions 3.0.32rc1, 4.0.22rc1, 4.4.10rc1, or 5.0.2rc1 to mitigate the vulnerability.
Monitor and restrict user input to prevent malicious script injection.

Long-Term Security Practices

Regularly update software and apply security patches promptly.
Conduct security audits and penetration testing to identify and address vulnerabilities.

Patching and Updates

Ensure that Zabbix software is regularly updated to the latest secure versions to prevent exploitation of known vulnerabilities.