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AUSCERT External Security Bulletin Redistribution
Apache Tika Denial of Service via XML Entity Expansion Vulnerability
10 October 2018
AusCERT Security Bulletin Summary
Product: Apache Tika
Publisher: The Apache Software Foundation
Operating System: UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2018-11796
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CVE-2018-11796: Apache Tika Denial of Service via XML Entity Expansion
The Apache Software Foundation
Apache Tika 0.1 to 1.19
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.
Apache Tika users should upgrade to 1.19.1 or later
This issue was discovered by Slava Gorelik of CloudAlly.
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