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HIGH

tika: Incomplete fix allows for XML entity expansion resulting in denial of service

Published Oct 9, 2018

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.

Affected products

Remediation

Red Hat statement

This issue affects the versions of tika which is embedded in the nutch package as shipped with Red Hat Satellite 5. The tika server is not exposed, as such exploitation is difficult, Red Hat Product Security has rated this issue as having security impact of Low. A future update may address this issue. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.

Metrics

Weaknesses (2)

CWE-611

XXE

CWE-776

References (10)

Change history (0)

No recorded changes yet.

Sources
CVE.org / MITRE
Status PUBLISHED
Assigner apache
Published Oct 9, 2018
Updated Sep 16, 2024
Reserved Jun 5, 2018
Link CVE-2018-11796
CISA Vulnrichment
Updated n/a
NVD
Status Modified
Modified Jun 17, 2026
Link CVE-2018-11796
Red Hat
Severity Moderate
Public date Oct 10, 2018
Links CVE-2018-11796 - Bugzilla
GHSA-H8Q5-G2CJ-QR5H