Yet another way to evade NIDS (and spread malware)
Although online privacy is something we always need to take care of, the use of anonymous proxy services could lead to trouble as well. First of all, the use of SSL prevents NIDS and most desktop-based IPS from checking those resources visited through the proxy, leaving the desktop antivirus with the full burden of protecting the computer. Then, in an enterprise environment, these systems can bypass security policies through URL and traffic encoding, allowing internal users to browse resources that would otherwise be restricted. For example, this could lead to users checking their private Web emails and downloading those "funny jokes" sent by their friends, unfiltered by the corporate network.
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