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Apache MyFaces Trinidad Information Disclosure

Apache MyFaces Trinidad Information Disclosure
Posted Sep 30, 2016
Authored by Teemu Kaariainen, Andy Schwartz

Apache MyFaces Trinidad versions 1.0.0 to 1.0.13, 1.2.1 to 1.2.14, 2.0.0 to 2.0.1, and 2.1.0 to 2.1.1 suffer from an information disclosure vulnerability.

tags | advisory, info disclosure
advisories | CVE-2016-5019
SHA-256 | d52ae0b80ff5e5d1cc0efc513c971067776f22f749a120d81c7b142b8af4aa14

Apache MyFaces Trinidad Information Disclosure

Change Mirror Download
Clarification: The first line in this CVE [1] was a copy&paste error
during message composition and is not part of the CVE. This line can
make it sound as if CVE-2016-5019 is only an information disclosure
vulnerability rather than a deserialization attack vector. I
apologize for the confusion.

--- Original Advisory ---
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:

Trinidadas 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 MACaed.

Trinidadas 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 KA$?A$?riA$?inen and reported by Andy Schwartz
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