CVE-2018-11796: XEE
First published: Tue Oct 09 2018(Updated: )
Apache Tika 1.19 included an incomplete fix for <a href="https://access.redhat.com/security/cve/CVE-2018-11761">CVE-2018-11761</a> which 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. External Reference: <a href="https://lists.apache.org/thread.html/88de8350cda9b184888ec294c813c5bd8a2081de8fd3666f8904bc05@%3Cdev.tika.apache.org%3E">https://lists.apache.org/thread.html/88de8350cda9b184888ec294c813c5bd8a2081de8fd3666f8904bc05@%3Cdev.tika.apache.org%3E</a> Upstream Issue: <a href="https://issues.apache.org/jira/projects/TIKA/issues/TIKA-2727">https://issues.apache.org/jira/projects/TIKA/issues/TIKA-2727</a> Upstream Patch: <a href="https://github.com/apache/tika/commit/86d4ba1e">https://github.com/apache/tika/commit/86d4ba1e</a>
Credit: security@apache.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/tika | <1.19.1 | 1.19.1 |
| Apache Tika | >=0.1<=1.19 |
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2018-11796 https://nvd.nist.gov/vuln/detail/CVE-2018-11796 https://lists.apache.org/thread.html/88de8350cda9b184888ec294c813c5bd8a2081de8fd3666f8904bc05@%3Cdev.tika.apache.org%3E
- https://bugzilla.redhat.com/show_bug.cgi?id=1639090
- https://access.redhat.com/errata/RHSA-2019:3892
- https://access.redhat.com/security/cve/cve-2018-11796
- http://www.securityfocus.com/bid/105585
- https://lists.apache.org/thread.html/88de8350cda9b184888ec294c813c5bd8a2081de8fd3666f8904bc05@%3Cdev.tika.apache.org%3E
- https://security.netapp.com/advisory/ntap-20190903-0002/
- https://access.redhat.com/security/cve/CVE-2018-11761
- https://issues.apache.org/jira/projects/TIKA/issues/TIKA-2727
- https://github.com/apache/tika/commit/86d4ba1e
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1639092
- https://access.redhat.com/security/updates/classification/
- https://access.redhat.com/support/policy/updates/jboss_notes
- https://lists.apache.org/thread.html/88de8350cda9b184888ec294c813c5bd8a2081de8fd3666f8904bc05%40%3Cdev.tika.apache.org%3E
Frequently Asked Questions
What is CVE-2018-11796?
CVE-2018-11796 is a vulnerability in Apache Tika 1.19 (CVE-2018-11761) that allows XML entity expansion.
How does CVE-2018-11796 affect Apache Tika?
CVE-2018-11796 affects Apache Tika versions 1.19 up to, but not including, 1.19.1.
What is the severity of CVE-2018-11796?
CVE-2018-11796 has a severity value of 7.5, indicating a high severity.
How can I fix CVE-2018-11796?
To fix CVE-2018-11796, upgrade Apache Tika to version 1.19.1.
What is XML entity expansion?
XML entity expansion is a technique where entities in an XML document are expanded to include additional information.
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