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So why are setuid and setgid binaries a potential security risk on your system Well, they have two problems. The first problem is that a user can use an existing setuid binary s greater privileges to perform actions that could be malicious on your system. Of course, some setuid and setgid files on your system actually require this functionality to operate, with the previously cited passwd command being one of these. The sendmail binary is another example. The second problem is that setuid or setgid commands or binaries owned by privileged users such as the root user can be easily created on your system by an attacker. This binary can be used to run an attack or compromise your system. Indeed, many root kits (see 6) use setuid or setgid binaries to compromise systems. So, the two aspects of setuid and setgid permissions you need to monitor and manage are as follows: Limit the number of setuid and setgid binaries on your system to only those binaries that require it. Regular checks for new and existing binaries that may have had setuid and/or setgid permissions set without your approval or knowledge. To do this, the first thing you need to do is identify all the setuid and setgid binaries on your system. Listing 4-10 provides a find command designed to locate setuid binaries. Listing 4-10. Finding setuid Files puppy# find / -perm -4000 -ls And Listing 4-11 provides a variation of this command for locating setgid binaries.

will display when errors have been flagged When proofing errors are found, click the button to display a shortcut menu with options to correct the error A feature you should consider enabling is the new Contextual Spelling option When this option is turned on, Word will identify errors like using the word to instead of too If you have enabled the options to mark grammar errors as you type, a wavy line displays below the possible error(s) You can right-click the word and select a correction from the shortcut menu Otherwise, the possible grammar error will display in the Spelling and Grammar dialog box Oddly, the Contextual Spelling option is not enabled in the default savings, so you may need to turn it on Another new option in the spelling and grammar checker is for ignoring repeated words In previous versions of Word, repeated words were flagged as errors.

s You can also use a tool such as sXid (available from http://linux.cudeso.be/linuxdoc/ Tip sxid.php) to automatically find setuid/setgid binaries. You could also look at the Debian command checksecurity.

After using the commands in Listings 4-10 and 4-11 you need to review all the files found and determine whether they all require setuid or setgid. If they can have the permissions removed, then use the chmod command to remove them.

Although we have now developed several systems with ASP.NET MVC, one of the most successful is the online application form that allows students to apply to our college via the web and then subsequently track the progress of their application. Despite being given short notice for the development of this project, we were able to implement it quickly thanks to the simplicity of the framework. The system was a resounding success and received over 1200 applications within the first 15 minutes of going live. I've been working with the ASP.NET MVC framework since its first public preview in late 2007. Since that time I've developed several intranet applications and two public facing websites with the framework. While ASP.NET MVC may not be suitable for everyone, I personally have found the framework's lightweight and stateless approach to web development a much more natural way of working than the pseudo-stateful approach used by ASP.NET Web Forms. However, using the framework so early in its development cycle had several problems. Firstly, the early previews contained a lot of breaking changes from release to release as its API evolved. This caused a lot of frustration as it constantly meant re-writing sections of our applications, but this is the price of being an early adopter. On top of this, there was initially a lack of publicly available documentation on the framework but thankfully the source code was available which made it possible to diagnose issues with relative ease.