Main problem with UNIX security is that superuser can do with system anything he wants. There are programs (daemons) which work with superuser privilegies, for example popd, sendmail, and accessible from network (Internet/Intranet). There could be bugs in any program, so intruder connects to such programs via network, exploit existing bugs in it and get a control over all host.

VXE (Virtual UNIX Environment) protects UNIX servers from such intruders, hacker attacks from network and so on. It protects software subsystems, such as: SMTP, POP, HTTP and any other subsystem, already installed on the server. There is no need to change configuration of existing software - just PROTECT it.

So, VXE solve the following problem: protects host and particular subsystems, which work as superuser and can have bugs. This is the situation we have in real life.

The complete set of VXE documentation is comprised of:

• VXE main - this document
• VXE overview
• VXE installation guide
• VXE user's guide

Home page of VXE is http://www.intes.odessa.ua/vxe