Points To Consider While Patching Your Operating System - Unfortunately, no code that is millions of lines long is perfect, and security holes will always exist. One of the best ways to protect yourself is to make sure your system has the most recent patch levels installed. |
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You are here: DIME Home > Programming and Scripting > Points To Consider While Patching Your Operating System
Unfortunately, no code that is millions of lines long is perfect, and security holes will always exist. One of the best ways to protect yourself is to make sure your system has the most recent patch levels installed.
Author: Venkatesh Pai
Date: Dec 21, 2009 - 11:42:31 AM
Unfortunately, no code that is millions of lines
long is perfect, and security holes will always exist. One of the best ways to
protect yourself is to make sure your system has the most recent patch levels
installed. Rarely does a virus or worm attack a brand new vulnerability;
rather, they attack known vulnerabilities for which patches exist. Typically,
people who discover vulnerabilities will report them to Microsoft, and a patch
is created and released along with the announcement of the vulnerability.
Administering
the Patching Process
When you are administering a production environment
with business-critical functions, it’s extremely important that you use a
controlled process to manage your patching. Here are some ideas to get you
started on a patching procedure.
Implement Change Control
First and foremost, you should implement a change
control process for your system. A change control process has
• Defined owners for the system, patch, and any applications
• Communication to all parties involved in the patch
• A waiting period, so that the interested and affected parties can raise
objections or questions; it’s often a good idea to get approval from each of
the owners before applying a patch
• An audit trail and back-out plan
• A scheduled time for installation and a defined outage window
Be
Consistent
When applying patches, make sure the same patch
level is applied to each server-unless you have a good reason not to do this.
Consistent installation is especially true for domain controllers, since
out-of-sync patches could mess with replication or authentication between DCs.
Read
the Documentation Always
Completely read the documentation for a patch
before you install it, so you can understand thoroughly what’s involved. That
way, you can determine whether applying the patch is going to disable some
needed functionality or cause issues with a certain piece of hardware or
software on your system. Reading the documentation will also educate you on
which patches are necessary and which ones are not critical.
Test It
Out
It is a good idea to have a test lab in your
organization that tests any new patches before they’re installed systemwide.
When you are completely satisfied that the patch performs appropriately and
have appropriate sign-off from everyone involved, target noncritical systems
first for patching. If you are not comfortable patching, don’t do it,
especially if the patch is a feature enhancement rather than a security patch.
Be Able
to Uninstall the Patch
If you can, install patches so that you can
uninstall them if you need to later on. That way, you can back out of a patch
if it causes problems on your system. You can usually find switches that allow
for this. Also, keep a backup of the system state data on hand, plus a full
backup of the system, just in case.
Make
Sure the Patch Is Relevant
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