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.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2018-11761 from the MITRE CVE dictionary dictionary and NIST NVD.
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/.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 7.5 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity Impact | None |
| Availability Impact | High |
| Platform | Package | State |
|---|---|---|
| Red Hat Software Collections for Red Hat Enterprise Linux | rh-eclipse46-tika | Will not fix |
| Red Hat Satellite 5 | tika | Will not fix |
| Red Hat JBoss Fuse Service Works 6 | tika-core | Under investigation |
| Red Hat JBoss Fuse 7 | camel-tika | Under investigation |
| Red Hat JBoss Data Virtualization 6 | tika-core | Under investigation |
| Red Hat JBoss BRMS 6 | tika-core | Under investigation |
| Red Hat JBoss BRMS 5 | tika-core | Under investigation |
| Red Hat JBoss BPMS 6 | tika-core | Under investigation |
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