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Date: Thu, 29 Sep 2016 11:50:28 -0400
From: Mike Kienenberger <mkienenb@...il.com>
To: announce@...aces.apache.org, MyFaces Development <dev@...aces.apache.org>, 
	MyFaces Discussion <users@...aces.apache.org>
Cc: "security@...che.org" <security@...che.org>, oss-security@...ts.openwall.com, 
	bugtraq@...urityfocus.com
Subject: CVE-2016-5019: MyFaces Trinidad view state deserialization security vulnerability

CVE-2016-5019 Apache MyFaces Trinidad information disclosure vulnerability

Severity: Important

Vendor:
The Apache Software Foundation

Versions Affected:
Trinidad from 1.0.0 to 1.0.13
Trinidad from 1.2.1 to 1.2.14
Trinidad from 2.0.0 to 2.0.1
Trinidad from 2.1.0 to 2.1.1

Description:

Trinidad’s CoreResponseStateManager both reads and writes view state
strings using
ObjectInputStream/ObjectOutputStream directly.  By doing so, Trinidad
bypasses the
view state security features provided by the JSF implementations - ie. the view
state is not encrypted and is not MAC’ed.

Trinidad’s CoreResponseStateManager will blindly deserialize untrusted
view state
strings, which makes Trinidad-based applications vulnerable to deserialization
attacks.

Mitigation:

All users of Apache Trinidad should upgrade to either 2.1.2, 2.0.2, or
1.2.15 and
enable view state encryption using org.apache.myfaces.USE_ENCRYPTION and related
web configuration parameters.
See http://wiki.apache.org/myfaces/Secure_Your_Application for details.

Upgrading all Commons Collections jars on the class path to 3.2.2/4.1
will prevent
certain well-known vectors of attack, but will not entirely resolve this issue.

References:
https://issues.apache.org/jira/browse/TRINIDAD-2542

This issue was discovered by Teemu Kääriäinen and reported by Andy Schwartz

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