How to Detect the: $DATA Attack in IIS Log Files (197464)

We strongly recommend that all users upgrade to Microsoft Internet Information Services (IIS) version 6.0 running on Microsoft Windows Server 2003. IIS 6.0 significantly increases Web infrastructure security. For more information about IIS security-related topics, visit the following Microsoft Web site:

http://www.microsoft.com/technet/security/prodtech/IIS.mspx

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IIS is configured by default to log access to the server. When logging is enabled and a request is made from a browser to IIS using Alternate Data Streams (for example http://myserver/file.asp::$DATA), IIS writes this information to the log file. By analyzing the log files kept by the server, any attempted access to source code can be determined.

The following examples show what a request to the "/default.asp" page of a server would look like if an attempt was made to view the file's source code:

   W3C Extended Log File Format:

      11:25:12 10.0.0.5 GET /default.asp::$DATA 200
      11:26:07 10.0.0.5 GET /default.asp::$DATA 304
      11:54:04 10.0.0.5 GET /default.asp::$DATA 200

   NCSA Common Log File Format:

      10.0.0.5 - - [02/Jul/1998:11:25:12 -0600] "GET /default.asp::$DATA
      HTTP/1.1" 200 13388
      10.0.0.5 - - [02/Jul/1998:11:26:07 -0600] "GET /default.asp::$DATA
      HTTP/1.1" 304 123
      10.0.0.5 - - [02/Jul/1998:11:54:04 -0600] "GET /default.asp::$DATA
      HTTP/1.1" 200 12219

   Microsoft IIS Log File Format:

      10.0.0.5,-
      ,02/Jul/1998,11:25:12,W3SVC,SERVER1,10.0.0.2,163,13388,200,0,GET,/de
      fault.asp::$DATA
      10.0.0.5,-
      ,02/Jul/1998,11:26:07,W3SVC,SERVER1,10.0.0.2,163,123,304,0,GET,/defa
      ult.asp::$DATA
      10.0.0.5,-
      ,02/Jul/1998,11:54:04,W3SVC,SERVER1,10.0.0.2,163,12219,200,0,GET,/de
      fault.asp::$DATA

How to Detect the: $DATA Attack in IIS Log Files (197464)

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