In Apache Tika 0.1 to 1.18, the XML parsers were not configured to limit entity expansion. They were therefore vulnerable to an entity expansion vulnerability which can lead to a denial of service attack. References: https://lists.apache.org/thread.html/5553e10bba5604117967466618f219c0cae710075819c70cfb3fb421@%3Cdev.tika.apache.org%3E
Created tika tracking bugs for this issue: Affects: fedora-all [bug 1632463]
Upstream commit: https://github.com/apache/tika/commit/bd9d75d8b0a85af2937047bfad04288c3044b2a6 Note that this commit would only apply cleanly to version 1.17 and later, which added XMLReaderUtils as part of the refactoring of XML parsers: https://github.com/apache/tika/commit/c0c2eafe46224e5c316f2dede395308930a5ec0d A fix for older versions would likely have to set entityExpansionLimit in all places XML parsers are created.
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/.
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2018-11761