CVE-2019-13644 : Exploit Details and Defense Strategies

Firefly III versions prior to 4.7.17.1 have a security weakness allowing stored cross-site scripting (XSS) attacks when user-provided data in a budget name is not properly filtered.

Understanding CVE-2019-13644

This CVE involves a vulnerability in Firefly III versions before 4.7.17.1 that could be exploited for stored XSS attacks.

What is CVE-2019-13644?

Firefly III versions prior to 4.7.17.1 are susceptible to stored cross-site scripting (XSS) due to inadequate filtering of user-supplied data in a budget name.
The vulnerability is triggered when a transaction containing JavaScript code is executed on the tags/show/$tag_number$ tag summary page.
Successful exploitation requires the attacker to have the same access privileges as the user.

The Impact of CVE-2019-13644

Attackers can execute malicious JavaScript code within the context of the user's session, potentially leading to unauthorized actions or data theft.

Technical Details of CVE-2019-13644

Firefly III versions before 4.7.17.1 are affected by a stored XSS vulnerability.

Vulnerability Description

User-provided data in a budget name is not properly filtered, enabling attackers to inject and execute malicious JavaScript code.

Affected Systems and Versions

Firefly III versions prior to 4.7.17.1

Exploitation Mechanism

Attackers can exploit the vulnerability by executing a transaction containing JavaScript code on the tags/show/$tag_number$ tag summary page.

Mitigation and Prevention

Immediate Steps to Take

Update Firefly III to version 4.7.17.1 or later to mitigate the vulnerability.
Avoid inputting untrusted data into budget names to prevent XSS attacks. Long-Term Security Practices
Regularly monitor and update software to patch known vulnerabilities.
Educate users on safe data handling practices to prevent XSS and other injection attacks.
Implement content security policies to restrict the execution of unauthorized scripts.