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There are many different software vendors that provide Web servers today. In addition, many applications come with the added ability to share documents or information over a Web protocol [Hypertext Transfer Protocol (HTTP)], effectively making them Web servers. So many exploits exist for Web servers that entire books are dedicated to securing Web services. The text that follows includes a brief discussion of three potential Web server exploits: packet sniffing, directory listing, and 8.3 compatible file names. After the discussion of exploits, we review some general guidelines on how to secure a Web server.
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For detailed information on securing Web servers, see NIST Special Publication 800-44, titled "Guidelines on Securing Public Web Servers." Packet Sniffing Web clients typically contact Web servers over the well-known TCP port 80. The port the Web server sends information to is dynamically negotiated during the TCP handshake. Normal HTTP communications are not encrypted and can be easily captured and decoded by a protocol analyzer. Methods for encrypting Web communications were covered in 6. Directory Listing Automatic directory listings, enabled by some Web servers, allow a client browser to see the contents of a directory when no default document is specified or available. A default document is the page that is loaded when a client navigates to a specific directory. For example, many Web servers specify a default document of index.html. When a client browser makes a connection to the Web server, the default document is loaded. However, if the client connects directly to a subdirectory without a default document, the client sees a listing of files and folders that is in the subdirectory. Attackers might use this feature to browse your Web server's directory structure and available files, which is called directory enumeration. To help prevent directory enumeration, disable automatic directory listings. Once this is done, your Web server posts an error message when the default document cannot be found. Attackers might attempt to use other methods to browse a Web server's directory structure. CERT
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warns about an exploit involving the use of Web publishing tools as a means to enumerate directories in their Vulnerability Note VU#32794, which is located at http://www.kb.cert.org/vuls/id/32794. 8.3 Compatible File Names Microsoft Windows 32-bit operating systems support two types of file names. The first type is called a long file name (LFN), which allows for file names of up to 255 characters. The second is the 8.3 compatible file name, which allows for eight-character file names plus a three-character file extension. Figure 8-5 illustrates a file named Longfilename.txt and its 8.3 compatible file name Longfi~1.txt.
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Figure 8-5. Example 8.3 compatible name The 8.3 compatible names are created to allow older 16-bit programs to work appropriately with files in the newer 32-bit Windows operating systems. Unfortunately, if you use the Web server application only to control access to files, an attacker can open a file using the 8.3 compatible file names without restrictions.
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Web servers that run on Windows 32-bit platforms might be vulnerable to this exploit. Some software vendors have released updates to correct this problem and others advise you to disable 8.3 compatible file name support. For more information on the 8.3 compatible file name issue, see CERT advisory CA-1998-04 at http://www.cert.org/advisories/CA-1998-04.html. General Tips for Securing a Web Server Instead of reviewing the multitude of potential Web server exploits and corrective actions, this section lists some general steps that you can take to secure a Web server. First, Web servers are most secure when you configure them as bastion hosts, meaning that you secure them as much as possible by removing as many services and programs from them as possible. The job of the Web server should be to serve Web pages and nothing more. Don't configure a Web server as a printer server or file server because that opens up additional avenues for exploitation. In addition to the items mentioned previously, here are some further items to consider when securing Web servers: Reduce features. Although you might want to provide a highly engaging and interactive Web site, you must consider that every additional feature is another potential point for compromise. Remove all unnecessary plug-ins, scripts, programs, and other features that are not required on the Web server.
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