Apache Tika: Denial of Service -- Remote/Unauthenticated

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.3055
   Apache Tika Denial of Service via XML Entity Expansion Vulnerability
                              10 October 2018

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        AusCERT Security Bulletin Summary
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Product:           Apache Tika
Publisher:         The Apache Software Foundation
Operating System:  UNIX variants (UNIX, Linux, OSX)
                   Windows
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-11796  

Original Bulletin: 
   https://lists.apache.org/thread.html/88de8350cda9b184888ec294c813c5bd8a2081de8fd3666f8904bc05@%3Cdev.tika.apache.org%3E

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CVE-2018-11796: Apache Tika Denial of Service via XML Entity Expansion
Vulnerability

Severity: Medium

Vendor:
The Apache Software Foundation

Versions Affected:
Apache Tika 0.1 to 1.19

Description:
In Apache Tika 1.19 (CVE-2018-11761), we added an entity expansion
limit for XML parsing.  However, Tika reuses SAXParsers and calls
reset() after each parse, which, for Xerces2 parsers, as per the
documentation, removes the user-specified SecurityManager and
thus removes entity expansion limits after the first parse.
Apache Tika 1.19 is therefore still vulnerable to entity
expansions which can lead to a denial of service attack.

Mitigation:
Apache Tika users should upgrade to 1.19.1 or later

Credit:
This issue was discovered by Slava Gorelik of CloudAlly.

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