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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.3055 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) 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 - --------------------------BEGIN INCLUDED TEXT-------------------- 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. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBW71nhGaOgq3Tt24GAQi4EhAAyxTdTox1nm29RPvLLqNz3o6sugWRWaQg YpCUIKuTOpw5i4RJN0owL/lrIo7sBwpVwbdsodfrdYQj0Z71USQ1JidQ/ek0XiPJ 6vjmJYrlfIyCk46rwWFBcWAngVQUOcQjjx8c2K9nXkK7U2aQP/T5RrAbFHAMwGZT gNKK3jRIssqeyp6eHm4ouldFtc5XIfOj4yzlI29aUQH+nD0us8kMgsjnU5RpEG+A LulxArv/DAw17dH6Nu7Xr63CU18Ooscg3v6/miRgvF8I5rpV2uWd04zgpOqju2BZ S/dezdROipGdpfuazOAPszPfmfgzhl1fSlnfAYU+UPwFSB5p2fQyi11U9AFKlINM SG6HqLmLbeEWwhpYnqH9dBXH9O7pEPyZLSXvbnwb4sm+w9mR12kWM8KQBUemTX6C 7xGw5wBT665pxmi9t6WIsyAOjWhoKQBSzGnp8DKfDoiAMu2/KodiBqR0HniRrQgX HVByGeiWtrDLWGko/HM8BbErtFjkvAlBdY3OAxbN/0oCX9xiTU7Hyap5vTblUMfs dvbuJDSE2rK6qZMV94A0ZDO+yXIr6pd+78ZZGkdOfO+C5oHD1fvIs4iQPAyh7QJr vzU9zZPBPK+typJe3lGkcZdMa3zp7uWfF3BT9BQzP9iNj9LLg092MBf6tQdXXsNt Lx6ljSnenEM= =1uFX -----END PGP SIGNATURE-----