[CVE-2011-4343] Apache MyFaces information disclosure vulnerability

[Leonardo Uribe <lu4242 () apache org>]

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CVE-2011-4343: Apache MyFaces information disclosure vulnerability

Severity: Important

Vendor: The Apache Software Foundation

Versions Affected:
            MyFaces Core 2.0.1 to 2.0.10
            MyFaces Core 2.1.0 to 2.1.4

Description:

If a submit outcome includes both faces-redirect=true and
includeViewParams=true
(or faces-include-view-params=true alias) it is possible to inject EL
expressions
directly into input fields mapped as view parameters.

Mitigation:

2.0.x users should update to 2.0.11
2.1.x users should update to 2.1.5
or apply the patch available on
https://issues.apache.org/jira/secure/attachment/12504807/MYFACES-3405-1.patch

Example:

Bean (request scoped):

private String value; // +getter+setter

public String submit() {
 String viewId = FacesContext.
getCurrentInstance().getViewRoot().getViewId();
 return viewId + "?faces-redirect=true&includeViewParams=true";
}

View:

<f:metadata>
<f:viewParam name="value" value="#{bean.value}" />
</f:metadata>
<h:form>
<h:inputText value="#{bean.value}" />
<h:commandButton value="submit" action="#{bean.submit}" />
</h:form>

Credit: Issue reported on JAVASERVERFACES issue tracer by user BalusC,
and reported back to MyFaces by Frederick Kämpfer.

References:
https://issues.apache.org/jira/browse/MYFACES-3405 
<https://issues.apache.org/jira/browse/MYFACES-3405>
http://java.net/jira/browse/JAVASERVERFACES-2247 
<http://java.net/jira/browse/JAVASERVERFACES-2247>

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regards,

Leonardo Uribe

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