CVE-2019-13647 : Vulnerability Insights and Analysis

Firefly III prior to version 4.7.17.3 is susceptible to a stored XSS vulnerability due to inadequate filtering of user-supplied data in image file content. This allows attackers to execute JavaScript code by exploiting the "attachments/view/$file_id$" route.

Understanding CVE-2019-13647

This CVE entry highlights a security flaw in Firefly III versions before 4.7.17.3 that enables stored XSS attacks.

What is CVE-2019-13647?

The vulnerability in Firefly III before version 4.7.17.3 permits stored XSS attacks by not properly filtering user-provided data in image file content. Exploiting this flaw involves viewing attachments through a specific route, leading to the execution of malicious JavaScript code.

The Impact of CVE-2019-13647

The vulnerability poses a risk of executing unauthorized JavaScript code, potentially compromising user data and system integrity.

Technical Details of CVE-2019-13647

Firefly III CVE-2019-13647 involves the following technical aspects:

Vulnerability Description

Stored XSS vulnerability in Firefly III
Lack of proper filtration of user-supplied data in image file content

Affected Systems and Versions

Firefly III versions prior to 4.7.17.3

Exploitation Mechanism

Attacker views attachments via the "attachments/view/$file_id$" route
Execution of JavaScript code through the vulnerability

Mitigation and Prevention

To address CVE-2019-13647, consider the following mitigation strategies:

Immediate Steps to Take

Upgrade Firefly III to version 4.7.17.3 or later
Avoid accessing attachments from untrusted sources

Long-Term Security Practices

Implement input validation and output encoding to prevent XSS attacks
Regularly update and patch Firefly III to address security vulnerabilities