-----BEGIN PGP SIGNED MESSAGE-----
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
- --------------------------BEGIN INCLUDED TEXT--------------------
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.
- --------------------------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 email@example.com
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:
Australian Computer Emergency Response Team
The University of Queensland
Internet Email: firstname.lastname@example.org
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-----
-----END PGP SIGNATURE-----