CVE-2018-11796

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

Severity Score

7.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

En Apache Tika 1.19 (CVE-2018-11761), se ha añadido un límite de expansión de entidades para el análisis XML. Sin embargo, Tika reutiliza SAXParsers y llama a reset() tras cada análisis y, en el caso de los analizadores Xerces2, tal y como se indica en la documentación, elimina el SecurityManager especificado por el usuario y elimina los límites de expansión de entidades tras el primer análisis. Por lo tanto, las versiones de la 0.1 a la 1.19 de Apache Tika siguen siendo vulnerables a expansiones de entidades, lo que podría conducir a un ataque de denegación de servicio (DoS). Los usuarios deberían actualizar a la versión 1.19.1 o posteriores.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2018-06-05 CVE Reserved
2018-10-09 CVE Published
2024-07-24 EPSS Updated
2024-09-16 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-611: Improper Restriction of XML External Entity Reference
CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')

CAPEC

References (6)

URL	Tag	Source
http://www.securityfocus.com/bid/105585	Third Party Advisory
https://lists.apache.org/thread.html/88de8350cda9b184888ec294c813c5bd8a2081de8fd3666f8904bc05%40%3Cdev.tika.apache.org%3E	X_refsource_confirm
https://security.netapp.com/advisory/ntap-20190903-0002	X_refsource_confirm

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://access.redhat.com/errata/RHSA-2019:3892	2023-11-07
https://access.redhat.com/security/cve/CVE-2018-11796	2019-11-14
https://bugzilla.redhat.com/show_bug.cgi?id=1639090	2019-11-14

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Apache Search vendor "Apache"		Tika Search vendor "Apache" for product "Tika"				>= 0.1 <= 1.19 Search vendor "Apache" for product "Tika" and version " >= 0.1 <= 1.19"		-		Affected