Hash: SHA1

             AUSCERT External Security Bulletin Redistribution

                    ESB-2009.0436 -- [Win][UNIX/Linux]
                Jetty HTTP server: Access Confidential Data
                                5 May 2009


        AusCERT Security Bulletin Summary

Product:              Jetty HTTP server
Publisher:            US-CERT
Operating System:     UNIX variants (UNIX, Linux, OSX)
Impact:               Inappropriate Access
Access:               Remote/Unauthenticated

Original Bulletin:    http://www.kb.cert.org/vuls/id/402580

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Vulnerability Note VU#402580
Jetty HTTP server directory traversal vulnerability


A vulnerability in the Jetty HTTP server could allow a remote attacker to 
gain access to files outside of the normal document tree.

I. Description

Jetty provides an HTTP server, HTTP client, and javax.servlet container. An 
error in the way canonical paths are interpreted in the HTTP server's URI 
handler results in a directory traversal vulnerability. This vulnerability 
affects all versions of Jetty up to and including jetty 6.1.16 and 
7.0.0.M2. In order for a system to be vulnerable, it must either be using 
the DefaultServlet with support for aliases explicitly enabled or the 
ResourceHandler class to serve static content. The vendor reports that 
systems running Jetty on Unix-like operating systems must also contain a 
directory name ending a '?' character in the web application or document 
root in order to be vulnerable.

II. Impact

A remote attacker can access files outside of the web application or 
document root by supplying a crafted URL to an vulnerable system.

III. Solution

Upgrade or apply a patch from the vendor

Jetty version 6.1.17 has been published to address this vulnerability. Users 
are encouraged to upgrade to this version.

The vendor has described the following workarounds for users who are unable 
to update their software:

      If you are not using the ResourceHandler, then you should
      confirm that your jetty instance is running with
      the Default servlet "aliases" initParam set to "false".
      You will find this setting in either your application's
      web.xml or the etc/webdefault.xml. If it is not set,
      then it takes the default, safe, value of "false".
      You should also check that the 
      system property is either not set, or set to true.

      If you are using the ResourceHandler, then you can secure your
      system against this vulnerability by compiling the source
      at the bottom of this message against the version of Jetty
      that you are using.  Use an instance of this class instead
      of the ResourceHandler

      package org.mortbay.jetty.cert;
      import java.net.MalformedURLException;
      import org.mortbay.jetty.handler.ResourceHandler;
      import org.mortbay.resource.Resource;
      import org.mortbay.util.StringUtil;
      import org.mortbay.util.URIUtil;
      public class TempFixResourceHandler extends ResourceHandler
          public Resource getResource(String path) throws MalformedURLException
              if (path!=null && path.indexOf('?')>=0)
                  if (path==null)
                      return null;
              return super.getResource(path);

Systems Affected
Systems using Jetty versions 6.1.16 and earlier, and versions 7.0.0M2 and 
Vendor	Status	Date Notified	Date Updated
Mort Bay	Vulnerable		2009-05-01


Thanks to Greg Wilkins of Mort Bay Consulting for reporting this 

This document was written by Chad R Dougherty.
Other Information
Date Public:	          2009-04-29
Date First Published:	  2009-05-01
Date Last Updated:	  2009-05-01
CERT Advisory:	 
US-CERT Technical Alerts:	 
Metric:	                  6.60
Document Revision:	  9

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