CVE-2019-5588 : Security Advisory and Response

A Cross-Site Scripting (XSS) vulnerability in Fortinet FortiOS versions 6.0.0 to 6.0.4 allows attackers to execute unauthorized script code via the SSL VPN web portal.

Understanding CVE-2019-5588

What is CVE-2019-5588?

This CVE refers to a reflected XSS vulnerability in Fortinet FortiOS 6.0.0 to 6.0.4, specifically within the SSL VPN web portal. Attackers could exploit this flaw to run unauthorized script code by manipulating the "err" parameter in HTTP requests.

The Impact of CVE-2019-5588

The vulnerability poses a risk of executing malicious scripts, potentially leading to unauthorized access or data theft.

Technical Details of CVE-2019-5588

Vulnerability Description

The XSS vulnerability in Fortinet FortiOS versions 6.0.0 to 6.0.4 allows attackers to inject and execute malicious scripts through the SSL VPN web portal.

Affected Systems and Versions

Product: Fortinet FortiOS
Vendor: Fortinet
Versions Affected: FortiOS 6.0.0 to 6.0.4

Exploitation Mechanism

Attackers can exploit this vulnerability by manipulating the "err" parameter in the error process HTTP requests to execute unauthorized script code.

Mitigation and Prevention

Immediate Steps to Take

Apply the security patches provided by Fortinet to address the vulnerability.
Monitor network traffic for any suspicious activities that may indicate exploitation attempts.

Long-Term Security Practices

Regularly update and patch all software and firmware to prevent known vulnerabilities.
Implement strong access controls and authentication mechanisms to restrict unauthorized access.

Patching and Updates

Ensure that Fortinet FortiOS is updated to versions beyond 6.0.4 to mitigate the XSS vulnerability.