By Raihan Al-Ekram, Archana Adma, Olga Baysal

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All of these steps take time and a tremendous effort from the good guys. Because of these inherent asymmetries, the security world understood a long time ago that the only way to combat attacks and provide any hope for good security is through a strategy known as defense-in-depth. This strategy uses multiple layers of security rather than trying to build an ultimate security layer. 1 illustrates this concept in nontechnical terms. If you employ multiple layers of security, then a hole that is punched through any one layer does not mean that your assets are compromised.

They contain sensitive configuration information that has been logged during installation. iss in the MSSQL\Install (or MSSQL$\Install). Microsoft provides a free utility called killpwd that locates and removes these passwords from your system. Secure the sa account with a strong password. Remove all sample users and sample databases. Review all passwords. At the very least, check for null passwords using the following SQL: select name, password from syslogins where password is null.

The reason is that this code oversteps memory that may belong to another variable or that may be used by other elements in the program. Before we move on to understand how this simple bug can be used by an attacker, it is worthwhile mentioning that the two code fragments shown previously are examples of problems that create stack buffer overflow vulnerabilities. There is a second class of buffer overflow problems that involve the heap and that occur when a developer would use char *buf = malloc(10) rather than char buf[100], but in general stack-based buffer overflow vulnerabilities are more common and the principles are not very different.

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