CVE-2018-11796 Information

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 versions from 0.1 to 1.19 are therefore still vulnerable to entity expansions which can lead to a denial of service attack. Users should upgrade to 1.19.1 or later.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

http://www.securityfocus.com/bid/105585 https://access.redhat.com/errata/RHSA-2019:3892 https://lists.apache.org/thread.html/88de8350cda9b184888ec294c813c5bd8a2081de8fd3666f8904bc05@3Cdev.tika.apache.org3E https://security.netapp.com/advisory/ntap-20190903-0002/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5