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On its own, a web server provides a minimum of functionality; much of the whizbang comes in the form of extensions, which are code libraries that add on to the core HTTP engine to provide features such as dynamic script execution, security, caching, and more Unfortunately, there s no free lunch, and extensions often bring trouble along for the party History is littered with vulnerabilities in web server extensions: Microsoft s Indexing extension, which fell victim to buffer overflows; Internet Printing Protocol (IPP), another Microsoft extension that fell victim to buffer overflow attacks circa IIS5; Web Distributed Authoring and Versioning (WebDAV); Secure Sockets Layer (SSL; for example, Apache s mod_ssl buffer overflow vulnerabilities, and Netscape Network Security Services library suite); and so on These add-on modules that rose to glory and faded into infamy in many cases should serve as a visceral reminder of the tradeoffs between additional functionality and security WebDAV extensions have been particularly affected by vulnerabilities in recent years Designed to allow multiple people to access, upload, and modify files to a web server, there have been many serious issues identified in Microsoft and Apache s WebDAV implementations The Microsoft WebDAV Translate: f problem, posted to Bugtraq by Daniel Docekal, is a particularly good example of what happens when an attacker sends unexpected input that causes the web server to fork execution over to a vulnerable add-on library The Translate: f vulnerability is exploited by sending a malformed HTTP GET request for a server-side executable script or related file type, such as Active Server Pages (asp) or globalasa files Frequently, these files are designed to execute on the server and are never to be rendered on the client to protect the confidentiality of programming logic, private variables, and so on (although assuming that this information will never be rendered on the client is a poor programming practice, in our opinion) The malformed.

.

11:

Of course, since most of the executables discussed already can be renamed, back doors will be difficult to differentiate from a legitimate service or process unless you ve inventoried your system at initial installation and after every upgrade and program installation (have we said that enough times yet ) Keeping Tabs on the File System Keeping complete lists of files and directories on a regular basis to compare with previous reports borders on the insane for overworked admins, but it s the surest way to highlight miscreant footprints if the system state isn t too dynamic For Novell you can use the ndir command to track file size, last accessed time, and so on For UNIX you can write a script that records every filename and its size with the ls la command For Windows you can use the dir command recording last saved time, last accessed time, and file size We also recommend the afind, hfind, and sfind tools from NTObjectives to catalogue files without altering access times, in addition to their ability to identify hidden files and alternate data streams within files Auditing can be enabled down to the file level on NT/2000 as well using the built-in capabilities of the NT File System (NTFS) Simply right-click the file or directory desired, select the Security tab, click the Auditing button, and assign the appropriate settings for each user or group Windows 2000 introduced Windows File Protection (WFP), which protects system files that were installed by the Windows 2000 setup program from being overwritten (this includes roughly 640 files under %systemroot%) An interesting side effect of this feature is that SHA-1 hashes of these critical files are maintained within a catalog file located at %systemroot%\system32\dllcache\nt5cat The hashes in this file could be compared with the SHA-1 hashes of the current system files to verify their integrity against the factory originals The File Signature Verification tool (sigverifexe) performs this verification process (click the Advanced button, Logging tab, and select Append To Existing Log File so that you can compare results with previous runs) Note, however, that WFP does not seem to associate each file with its unique signature Russ Cooper of NTBugtraq noted in May 2000 that WFP does not note the copying of one signed file over another (for example, copying notepadexe over wscriptexe will be missed) In our testing, we copied a non-Windows file over wscriptexe and sigverif still okays its integrity! Best not to rely on this one until the kinks get worked out.

request causes IIS to send the content of such a file to the remote client rather than execute it using the appropriate scripting engine The key aspects of the malformed HTTP GET request include a specialized header with Translate: f at the end of it and a trailing backslash (\) appended to the end of the URL specified in the request An example of such a request is shown next (The [CRLF] notation symbolizes carriage return/linefeed characters, 0D 0A in hex, which would normally be invisible) Note the trailing backslash after GET globalasa and the Translate: f header:

14:

GET /globalasa\ HTTP/10 Host: 1921682010 Translate: f [CRLF] [CRLF]

Third-party tools include MD5sum, a file-integrity checking tool available as part of the Textutils package under the GNU General Public License from ftp://ftpgnuorg/ pub/gnu/textutils/ A version compiled for Windows is available within the Cygwin environment from http://sourcewarecygnuscom/cygwin/ MD5sum can compute or verify the 128-bit message digest of a file using the widely used MD5 algorithm written by Ron Rivest of the MIT Laboratory for Computer Science and RSA Security It is described in RFC 1321 The following example shows MD5sum generating a checksum for a file, and then verifying it: