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Test and Audit Each Program It is important to test and audit each program Many times programmers are unaware of a potential buffer overflow condition; however, a third party can easily detect such defects One of the best examples of testing and auditing UNIX code is the OpenBSD (wwwopenbsdorg) project run by Theo de Raadt The OpenBSD camp continually audits their source code and has fixed hundreds of buffer overflow conditions, not to mention many other types of security-related problems It is this type of thorough auditing that has given OpenBSD a reputation for being one of the most secure free versions of UNIX available Disable Unused or Dangerous Services We will continue to address this point throughout the chapter Disable unused or dangerous services if they are not essential to the operation of the UNIX system Intruders can t break into a service that is not running In addition, we highly recommend the use of TCP Wrappers (tcpd) and xinetd (http://wwwsynacknet/xinetd/) to selectively apply an access control list on a per-service basis with enhanced logging features Not every service is capable of being wrapped However, those that are will greatly enhance your security posture In addition to wrapping each service, consider using kernel-level packet filtering that comes standard with most free UNIX operating systems (for example, ipchains or netfilter for Linux and ipf for BSD) For a good primer on using ipchains to secure your system, see http://wwwlinuxdocorg/HOWTO/IPCHAINS-HOWTOhtml Ipf from Darren Reed is one of the better packages and can be added to many different flavors of UNIX See http://wwwobfuscationorg/ipf/ipf-howtohtml for more information Disable Stack Execution Some purists may frown on disabling stack execution in favor of ensuring each program is buffer-overflow free It has few side effects, however, and protects many systems from some canned exploits In Linux there is a no-stack execution patch available for the 20x and 22x series kernels This patch can be found at http://wwwopenwallcom/linux/ and is primarily the work of the programmer extraordinaire, Solar Designer For Solaris 26 and 7, we highly recommend enabling the no-stack execution settings This will prevent many Solaris-related buffer overflows from working Although the SPARC and Intel application binary interface (ABI) mandate that the stack has execute permission, most programs can function correctly with stack execution disabled By default, stack execution is enabled in Solaris 26 and 7 To disable stack execution, add the following entry to the /etc/system file:.

you can see what adjustments are required you may not be able to tell when the table is empty or only partially filled To adjust your table s columns, rows, or individual cells, try these techniques:

Six US states do not collect sales tax: Alaska, Delaware, Hawaii, Montana, New Hampshire, and Oregon Personally, I find collecting sales tax and reporting it to the state a difficult process Well, the collecting part isn t so difficult Most of my customers pay through PayPal When they pay, PayPal calculates the sales tax automatically and adds it to their invoice (see Figure 13-7 for an example) The problem is not in collecting the sales tax from your customers It occurs when you have to pay sales tax to your state The Illinois Department of Revenue sends me a form once a month and I have to fill it out with information on any sales tax I collected in the previous month Usually, this sends me into a frenzy, looking through copies of old invoices to find any that include sales tax I find it

Keep in mind that disabling stack execution is not foolproof Disabling stack execution will normally log any program that tries to execute code on the stack and tends to thwart most script kiddies However, experienced attackers are quite capable of writing (and distributing) code that exploits a buffer overflow condition on a system with stack execution disabled While people go out of their way to prevent stack-based buffer overflows by disabling stack execution, other dangers lie in poorly written code While not getting a lot of

column s wall (as shown here) and then drag when your mouse turns into a horizontal two-headed arrow Drag outward to widen the cell or inward to narrow it Adjusting row height works the same way, but be sure to point to the top or bottom wall of the row and look for a vertical two-headed arrow before you drag to resize

FIGURE 13-7

attention, heap-based overflows are just as dangerous Heap-based overflows are based on overrunning memory that has been dynamically allocated by an application This differs from stack-based overflows, which depend on overflowing a fixed-length buffer Unfortunately, vendors do not have equivalent no heap execution settings Thus, you should not become lulled into a false sense of security by just disabling stack execution While not covered in detail here, more information on heap-based overflows can be found from the research the w00w00 team has performed at http://wwww00w00org/ files/heaptut/heaptuttxt

want to resize (drag through the cells in that column or row) and choose Table | Table Properties In the resulting dialog box, click the appropriate tab Column or Row These tabs allow you to set specific measurements by typing or using the spinner triangles Yes, there s a Cell tab in the Table Properties dialog box, but if you make adjustments to an individual cell, the entire row and/or column containing that cell will be adjusted as well unless you have that cell selected If your cursor is merely in the cell, then the column and/or row will be adjusted, too

CHAPTER 13:

Popularity: Simplicity: Impact: Risk Rating: 8 9 8 9