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10.5.2. Patching the System
Patching affected systems is a more dangerous course of action and should be undertaken with great caution. The problem with patching a system instead of reinstalling is determining whether or not a given system is cleansed of trojans, security holes, and corrupted data. Most rootkits (programs or packages that a cracker uses to gain root access to a system), trojan system commands, and shell environments are designed to hide malicious activities from cursory audits. If the patch approach is taken, only trusted binaries should be used (for example, from a mounted, read-only CD-ROM).
