oss-security - [CVE-2018-11796] Apache Tika Denial of Service via XML Entity Expansion Vulnerability

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Message-ID: <CAC1dCwUfCG9Vo8UhBzE1U7EgedjaVuDqQ3qYpXn0mFv8DXYT0Q@mail.gmail.com>
Date: Tue, 9 Oct 2018 16:05:18 -0400
From: Tim Allison <tallison@...che.org>
To: announce@...che.org, dev@...a.apache.org, user@...a.apache.org, 
	Apache Security Team <security@...che.org>, oss-security@...ts.openwall.com
Subject: [CVE-2018-11796] Apache Tika Denial of Service via XML Entity
 Expansion Vulnerability

CVE-2018-11796: Apache Tika Denial of Service via XML Entity Expansion
Vulnerability

Severity: Medium

Vendor:
The Apache Software Foundation

Versions Affected:
Apache Tika 0.1 to 1.19

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 1.19 is therefore still vulnerable to entity
expansions which can lead to a denial of service attack.

Mitigation:
Apache Tika users should upgrade to 1.19.1 or later

Credit:
This issue was discovered by Slava Gorelik of CloudAlly.

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