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Category:   Application (Web Server/CGI)  >   Resin Vendors:   Caucho Technology
Resin Input Validation Flaw in the Built-in Web Server Lets Remote Users Traverse the Directory By Specifying an Absolute Path
SecurityTracker Alert ID:  1016109
SecurityTracker URL:
CVE Reference:   CVE-2006-1953   (Links to External Site)
Date:  May 16 2006
Impact:   Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 3.0.17, 3.0.18
Description:   A vulnerability was reported in Caucho Resin in the built-in web server. A remote user can view arbitrary files on the target system.

A remote user can create a specially crafted URL that requests a file by its absolute path (with the '%5C' character for the windows directory separator '\') to view any file on the specified drive.

A demonstration exploit URL is provided:


The vendor was notified on April 20, 2006.

Rapid7 discovered this vulnerability.

The original advisory is available at:

Impact:   A remote user can view arbitrary files on the target system.
Solution:   The vendor has issued a fixed version (3.0.19), available at:

Vendor URL: (Links to External Site)
Cause:   Access control error, Input validation error
Underlying OS:  Windows (Any)

Message History:   None.

 Source Message Contents

Subject:  Caucho Resin Windows Directory Traversal Vulnerability

                        Rapid7 Security Advisory
            Visit to download NeXpose,
        SC Magazine Winner of Best Vulnerability Management product.

Rapid7 Advisory R7-0024
Caucho Resin Windows Directory Traversal Vulnerability

   Published:  May 16, 2006
   Revision:   1.0

   CVE:    CVE-2006-1953

1. Affected system(s):

    o Caucho Resin v3.0.18 for Windows
    o Caucho Resin v3.0.17 for Windows

    o Caucho Resin v3.0.19
    o Caucho Resin v3.0.16 and earlier

2. Summary

   The Caucho Resin web application server for Windows contains a
   directory traversal vulnerability that allows remote
   unauthenticated users to download any file from the system. It is
   possible to download files from any drive on the system.

   Rapid7 have updated NeXpose to check for this vulnerability. Licensed
   customers will receive the new vulnerability checks automatically.
   Visit to register for a free demo of NeXpose.

3. Vendor status and information

   Caucho Technology, Inc.

   Caucho was notified of this vulnerability on April 20th, 2006.
   They fixed this vulnerability in the latest unofficial snapshot
   of Resin 3.0.19, available from Caucho's website.

4. Solution

   Upgrade to the latest snapshot version of Resin, version 3.0.19.

5. Detailed analysis

   Caucho Resin is a servlet and JSP server. Resin ships with its own
   standalone web server which runs by default on port 8080. Any remote
   user can request URLs of the form:


   to access the root of the C: drive (and any files below it). Any
   drive letter can be specified.  Only Resin on Windows is vulnerable.

   This vulnerability appears to have been introduced in Resin
   version 3.0.17, although this has not been confirmed by the vendor.

6. Contact Information

   Rapid7 Security Advisories
   Phone:  +1 (617) 603-0700

7. Disclaimer and Copyright

   Rapid7, LLC is not responsible for the misuse of the information
   provided in our security advisories.  These advisories are a service
   to the professional security community.  There are NO WARRANTIES
   with regard to this information.  Any application or distribution of
   this information constitutes acceptance AS IS, at the user's own
   risk.  This information is subject to change without notice.

   This advisory Copyright (C) 2006 Rapid7, LLC.  Permission is
   hereby granted to redistribute this advisory, providing that no
   changes are made and that the copyright notices and disclaimers
   remain intact.


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