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Perhaps the most well-known buffer overflow exploit in recent memory is the CodeRed worm, which exploited a vulnerability in an Index Server Internet Server Application Programming Interface (ISAPI) application shipped as part of Microsoft Internet Information Server (IIS). Ironically, the vulnerable code did actually check the length of the user input to ensure it did not contain more char acters than the maximum number of bytes allocated for the buffer the recom mended best practice for preventing buffer overruns. However, the developer who wrote the code verified the width of the buffer by checking the number of bytes instead of checking the number of characters. The buffer was allocated

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2. To modify the HTTP signatures settings on the HTTP policy, click the Signatures tab as shown in Figure 7-21. The Signatures tab shows the signatures that will be blocked.

1. In Disk Management, right-click the free space in the extended partition where you want to create the logical drive and select Create Logical Drive. 2. On the Welcome page for the Create Partition Wizard, click Next. 3. On the Select Partition Type page, choose Logical Drive and click Next. 4. On the Specify Partition Size page, enter the amount of disk space in MB that you want to use for this logical drive and click Next. 5. On the Assign Drive Letter Or Path page, choose an available drive letter and click Next. 6. On the Format Partition page, choose Format This Partition, select a file system, and then assign a volume label. Click Next. 7. On the completion page, click Finish to create and format the logical drive. Figure 8-4 shows an extended partition on Disk 1, containing a 502-MB logical drive, and 612 MB of remaining free space.

Although Microsoft tests updates rigorously before releasing them publicly, no one can test every possible software and hardware configuration for adverse side effects that might result when an update is applied For this reason, you should deploy updates to a small group of computers prior to deploying updates to all computers in your organization and test those computers to determine whether a newly released update conflicts with your organization s specific software configuration You should ensure that the small group of computers on which you test updates match the software and hardware configuration of computers in your organization and that the computers used for testing are actually used by real people to perform their everyday jobrelated tasks You need to do this because you will not be able to detect all possible problems by simply installing the update on a computer that no one actually uses.

15. Locate and double-click the following file on the Supplemental Course Materials CD-ROM: 6/Ch6b.bat. The batch file is executed, restoring the correct DNS settings. (The batch file will not alter the correct DNS settings if they are already configured.) 16. Using Internet Explorer, verify that you can once again connect to Internet resources specified by DNS name. 17. Log off both Computer1 and Computer2.

1. Your organization has just deployed an ISA Server computer as a firewall. The security policy for your organization requires that all settings on the ISA Server computer be configured as securely as possible. After you implement a secure configuration, users report that they can no longer access a streaming media site. Access to this site is critical for the company, so you must enable access to the site. What security setting should you change to enable access to the site a. Enable IP routing b. Disable all filtering based on IP options c. Disable filtering of IP fragments d. Disable filtering based on the source-routing IP options