The Privacy BlogPrivacy, Security, Cryptography, and Anonymity

Nov/14

5

How to protect your Mac from Rootpipe

sudo make me a sandwich

https://xkcd.com/149/

Security researcher Emil Kvarnhammar of TrueSec announced the discovery of a new vulnerability in Mac OS X from 10.8.5 though the current 10.10.

The attack is against a unix utility called “sudo” which allows commands to run as the “root” user (which has absolute power on the system). Normally a user with admin privileges needs to type in their password and approve the running of these tasks, but this attack bypasses the user authentication step.

They have not released details on the vulnerability to give Apple time to issue a fix. In the mean time, it looks like you can protect yourself by making your your normal account is not an admin account.

If you are not sure whether your account is an admin account, open System Preferences and click on “Users & Groups”. It will say under your account name whether the account is “Admin” or “Standard”.

Admin prefs

User accountsYou need to have at least one admin account on the computer. If you are Admin, take the following steps to protect yourself.

  1. If there is no other Admin account on the computer, create a new account by pressing the “+” in the lower left of the list of accounts (you may need to unlock the panel first).
  2. Log out of your account and log in to the new Admin account.
  3. As that Admin user, go into the System Preferences / Users & Groups again.
  4. Click on your normal account and uncheck the “Allow user to administer this computer” checkbox.Admin accounts
  5. Log out of the Admin account and log back into your normal account.
You are now safe from attacks using this vulnerability. It is generally a good idea to use your computer from a non-admin account whenever possible. You may need to log in to the admin account, or at least use its password, for installing some software and drivers, but in general you should not see any impact from this change, other than improved security.

TrueSec outlines “Rootpipe” privilege escalation vulnerability in Mac OS X Yosemite

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Lance Cottrell is the Founder and Chief Scientist of Anonymizer. Follow me on Facebook, Twitter, and Google+.

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