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"Using a Least-Privileged User Account" OR "Woohoo, I've been published on microsoft.com!"

  Well, not to toot my own horn too loudly, but I've had my first external facing document, Using a Least-Privileged User Account (LUA), published on TechNet as part of the monthly Microsoft Security Newsletter for January 2005.  This newsletter is considered the authoritative information source for understanding the Microsoft security strategy and priorities and is written for IT professionals, developers, and business managers.

  The article is fairly brief and just quickly touches on a few of the key issues around the principle of "least-privilege".  Anyone who has been a victim of viruses, worms, and other malicious software (malware) should appreciate this principle - after all, if all processes ran with the smallest set of privileges needed to perform the user's tasks, it would be more difficult for malicious and annoying software to infect a machine and propagate to other machines.  Unfortunately, successfully taking advantage of this principle as a method of defence against external attacks by setting up LUA accounts for daily use is not at all straightforward so my article discusses some of these pitfalls and then points readers to some very useful resource sites to help with this process.

  Please take a moment to read my article and, if you do, consider leaving a comment or sending email to our feedback alias (lua-qa@microsoft.com) with your thoughts about the article or around the principle of "least-privilege" in general.

Published Tuesday, January 18, 2005 5:19 PM by strawberryJAMM
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Comments

# re: "Using a Least-Privileged User Account" OR "Woohoo, I've been published on microsoft.com!"

Wednesday, January 19, 2005 1:27 PM by Will
My company has a software product that's running on kiosk-type equipment out in the field during its beta testing. These are XP machines, and the program is run under a user who is a member of the Power user's group (we did that because of some of the system access it required). We just found that one of the units had gotten infected with a virus that's working its way through the network of the location where the unit was installed. We're not sure which virus it is, but I was surprised the amount of damage that could be done to an operating system by a power user.

# re: "Using a Least-Privileged User Account" OR "Woohoo, I've been published on microsoft.com!"

Tuesday, January 25, 2005 5:50 PM by Jenni Merrifield (strawberryJAMM)
Will:

You're absolutely right, the Power User group has far too many rights to be that useful from a security restriction point of view. It's also childishly easy for bad code to elevate to Admin from an account with Power User rights.

Over here, we generally suggest that you forget Power User even exists because it just gives you a false sense of security. Either use Admin or User, and if you don't need to be Admin but you do need more than a traditional User, start with User rights and then add just the permissions that the process actually needs.
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