-------------------------------------------------------------------------------------------------- CVE-2011-4367: Apache MyFaces information disclosure vulnerability Severity: Important Vendor: The Apache Software Foundation Versions Affected: MyFaces Core 2.0.1 to 2.0.11 MyFaces Core 2.1.0 to 2.1.5 Earlier versions are not affected Description: MyFaces JavaServer Faces (JSF) allows relative paths in the javax.faces.resource 'ln' parameter or writing the url so the resource name include '..' sequences . An attacker could use the security vulnerability to view files that they should not be able to. Mitigation: Users of affected versions should apply one of the following mitigations: MyFaces Core 2.0.x users should update to 2.0.12 MyFaces Core 2.1.x users should update to 2.1.6 Example: In linux or similar systems: http://<hostname>:<port>/<context-root>/faces/javax.faces.resource/web.xml?ln=../WEB-INF http://<hostname>:<port>/<context-root>/faces/javax.faces.resource/../WEB-INF/web.xml or in windows systems: http://<hostname>:<port>/<context-root>/faces/javax.faces.resource/web.xml?ln=..\\WEB-INF http://<hostname>:<port>/<context-root>/faces/javax.faces.resource/..\\WEB-INF/web.xml The 'ln' parameter should not allow a relative path. In the above example the contents of the web.xml are displayed in the response to the attacker. The part of the url that derive the resource name should not allow '..' as valid char sequence. Credit: Issue reported by Paul Nicolucci thanks to the security team at IBM References: -------------------------------------------------------------------------------------------------- regards, Leonardo Uribe