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Bug 1632462 - (CVE-2018-11761) CVE-2018-11761 tika: XML entity expansion vulnerability due to lack of limit configuration
CVE-2018-11761 tika: XML entity expansion vulnerability due to lack of limit ...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20180919,repor...
: Security
Depends On: 1632463 1636026
Blocks: 1632464
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Reported: 2018-09-24 16:40 EDT by Pedro Sampaio
Modified: 2018-10-04 05:38 EDT (History)
40 users (show)

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Fixed In Version: tika 1.19
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Description Pedro Sampaio 2018-09-24 16:40:19 EDT 
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
Comment 1 Pedro Sampaio 2018-09-24 16:40:40 EDT 
Created tika tracking bugs for this issue:

Affects: fedora-all [bug 1632463]
Comment 2 Tomas Hoger 2018-10-04 03:37:42 EDT 
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.
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