Trying to keep your company's information secure is a lot of work and is
unlikely to make you popular with users. Typically, the tighter you try to lock
down a network, the more hassle the network
is to administer as repetitive tasks become necessary for both end users and you. But there
are ways to ease the pain—often by deploying
automation technology. Let's look at six common security annoyances and practical, effective ways to overcome them.
Password Resets
Resetting passwords for users who forget them
is the bane of every administrator. A META
Group survey indicates that this thankless task
alone costs companies with 10,000 users well
over half a million dollars a year (http://www.microsoft.com/technet/security/guidance/
identitymanagement/idmanage/p2pass.mspx). But there are ways to reduce or even
eliminate this problem. My favorite solution is
to use electroshock therapy. With a few simple
modifications to a keyboard's wiring and a
device-driver hack, you can deliver 120 volts of
behavior-changing juice to the nervous system
of your users when they enter their passwords
incorrectly. A couple of jolts and your problem
is solved!
You can train users to remember passwords with less violent behavior-modification methods. The most effective password-memorization technique I've found is creating
passwords by using the first letter of each
word of a sentence that the user can remember. You'll need to use a sentence that has
some proper nouns and numbers so that this
technique produces a complex password with
upper-case letters and nonletter characters.
You can let users come up with their own sentences, but I've had better success assigning
users passwords based on a sentence of my
choosing. Assigning passwords this way carries
the added benefit of the enjoyment you get by
forcing users to mentally recite your brutally
honest observations about their personality
or appearance. Of course, if you have one of
those irksome corporate security policies that
says you shouldn't know everyone's password
(like you can't just run a password cracker,
right?), then you might have to look at other
alternatives.
Enter the automated password reset tool.
Let's think about it. Resetting a user's password is
a pretty mundane, clerical process: Authenticate
the person requesting the password reset, find
his or her account, and reset its password. Why
not automate this? A variety of self-service password reset solutions are already on the market to
take this burden off your shoulders, and it's not
hard to justify the cost when you consider the
savings in IT staff time. Solutions on the market
provide various methods for letting users reset their own passwords, from Web-based applications to telephone-based systems. Some of the
players include Avatier Password Station and
M-Tech Information Technology's P-Synch. Just
do a Web search for "password reset self-service"
and you're on your way.
Protecting Laptop Data
Protection of laptop data is receiving increasing
scrutiny from legislators and the media. When
an organization loses a laptop containing customers' personal information, the organization
is in for some hefty unexpected costs associated
with notifying each customer of the security
breach as well as the more-difficult-to-quantify
costs of bad press and loss of good will.
I've watched this problem and the technologies designed to address the risk of stolen
or lost laptops for years. Many solutions have
caused more problems in terms of stability or administration than they were worth.
Other solutions slowed down systems or were
too impractical because they depended on
users to encrypt or decrypt files or manage encryption keys. I've used Windows
Encrypting File
System (EFS) for
my clients, but
drawbacks and instance, EFS doesn't support whole-volume
encryption, so data can leak out from unencrypted folders.
Windows Vista's new BitLocker Drive
Encryption feature for whole-volume encryption and its integration with the Trusted Platform Module (TPM) found in most business
laptops today provides the best all-around
solution for protecting data on laptops. In fact,
I'd say BitLocker is the single biggest motivator
for migrating your laptop fleet to Vista.
With BitLocker, you divide your hard drive
into two volumes. One volume is very small
(just a few megabytes) and initially left empty;
you install Vista to the partition that occupies
the rest of the drive. Then you enable BitLocker and wait for it to encrypt the entire large volume. BitLocker installs a bootstrap loader on
the small volume, which is protected from tampering by the laptop's TPM. When the laptop is
turned on, the TPM checks, through hashes
stored in its tamper-resistant memory, whether
the tiny bootstrap partition has been modified.
If it hasn't, the TPM allows the bootstrapper to
load. The bootstrapper retrieves the encryption
key for the larger volume from the TPM and
proceeds to boot Vista on the larger, encrypted
volume. This description is a bit simplified, but
the bottom line is that for the first time, we have
laptop hardware, tamper-resistant key storage,
and whole-volume encryption all integrated
with the OS for the most transparent, best performing, and effective encryption solution I've
seen to date. To learn more about BitLocker,
see the Windows BitLocker Drive Encryption
Step-by-Step Guide (http://www.microsoft.com/technet/windowsvista/library/c61f2a128ae6-4957-b031-97b4d762cf31.mspx).
Lovely Spam,
Wonderful Spam
Spam is such a pain. Kind of the understatement of the decade, eh? We all hate it, and it's
a security threat because we can all too easily
open an attachment containing a virus.
If you aren't careful, though, your antispam solution can become an even bigger pain. No
antispam solution is 100 percent accurate. You
run two basic risks with an antispam solution:
user dissatisfaction with low catch rates and
user dissatisfaction with false positives, both
of which lead to increased care and feeding of
users by IT staff (i.e., support calls).
In my experience, an 80 percent catch rate
for spam is pretty reasonable; users shouldn't
expect much better unless they're willing to
regularly hunt down good email messages that
got caught by the spam filter. Many antispam
solutions claim a much higher catch rate but
don't mention their false positive statistics.
Moreover, catch rates vary from organization
to organization, and even user to user, because of the content and phrases peculiar to different
industries and what each user considers to be
spam. A marketing professional may have a
view of spam very different from a technician
who doesn't have much interaction outside the
organization.
In my opinion, Sender Policy Framework
(SPF) spam detection has the best potential to
significantly reduce spam, but too few companies have taken the time to publish an SPF
record for their DNS domain. An SPF record
published in your domain's zone file formally
declares the official SMTP servers for your
domain so that other organizations can determine if email that purports to be from your
domain really is. Don't delay: There are great
setup wizards on the Internet that will help
you build your own SPF record—for instance, http://www.openspf.org.
As seductive as the idea of a Bayesian-based,
"self-learning" antispam solution is, I've had
better luck with frequently updated signature-based spam-detection solutions. Like antivirus
solutions, signature-based spam-detection solutions require the vendor to constantly monitor messages, quickly update their signature
database, and just as quickly push the updated
file to their customers. Microsoft Exchange Intelligent Message Filter (IMF) would be a much
better solution if Microsoft updated it more
frequently. I always see a dramatic drop in spam after I install an IMF update, but the amount of
uncaught spam immediately begins to climb.
Other signature-based spam solutions, such as
St. Bernard Software's ePrism, are much more
frequently updated. There are also a number
of antispam services available that relieve you
from installing and maintaining any software by
routing your mail through the antispam service's
servers first.
Perhaps the biggest risk in implementing
an antispam solution is the potential increase
in support calls from users trying to find email
messages that were apparently eaten by the
antispam solution. Any solution that requires
you to get involved when a user needs to
retrieve a false positive is more trouble than
it's worth. My advice is to install only antispam
solutions that make all email identified as
spam easily accessible to the user—preferably
without leaving the email client. As examples,
you can configure both IMF and GFI Software's GFI MailEssentials to put all spam into
the recipient's junk email folder. Even better,
GFI MailEssentials lets you specify a different
folder for each antispam method it supports,
so you can determine which method (e.g.,
Bayesian, SPF, Realtime Blackhole List—RBL)
is responsible for misclassifying a good email
message by the folder in which it ends up.
Wi-Fi Security
Most organizations I run into are still using
Wired Equivalent Privacy (WEP) standard or
Wi-Fi Protected Access (WPA) pre-shared keys
to secure their wireless LANs (WLANs). WEP
isn't secure no matter how strong your shared
key is due to vulnerabilities in the protocol
and associated algorithms. WPA and WPA2
pre-shared keys are secure only if they are at
least 22 characters long and drawn from a large
character set. Long shared keys, though, are an
annoying, time-sapping problem for IT staff
and users because of all the management and
security issues that arise. Users can't remember them, so you're constantly asked for the
key, and frighteningly few users seem capable
of typing more than a few characters correctly
in sequence. Whenever a new computer is
commissioned or a contractor comes in, you
must get them access to the WLAN. And what
happens if a pre-shared key is compromised?
The solution is elimination. Get rid of WPA
with pre-shared keys (WPA-PSK). No, not
WPA altogether—just the PSK part. Implement
802.1x in place of pre-shared key authentication. With 802.1x, you configure your Access
Points (APs) to interface with Active Directory
(AD) via Remote Authentication Dial-In User
Service (RADIUS) to authenticate users and
computers based on their AD credentials. You
have to install Internet Authentication Services
(IAS) on one of your Windows servers, such
as a domain controller (DC); IAS is Windows'
built-in RADIUS server. After installing IAS, you
introduce the APs and IAS to each other with
some simple configuration settings, and in no
time your Windows wireless clients will begin
authenticating to your WLAN by using either
the computer's or the user's credentials.
By applying a few Group Policy settings, you
can make the authentication process transparent to users of computers that belong to your
domain. Outside users such as contractors and
consultants that need access to your WLAN simply need to enter the user name and password
of an AD account that you provide them. IAS
allows you to limit access to WLAN and internal
wired networks based on group membership,
which allows you to restrict external consultants to Internet-only access, for instance. For
detailed directions for implementing 802.1x on
your WLAN, see the Windows IT Security article
"Reaping the Benefits of WPA and PEAP," June
2006, InstantDoc ID 50105. By replacing WPAPSK with 802.1x, you leverage the user accounts
you already manage in AD and eliminate the
headaches of pre-shared keys.
Restoring Files
Backup and recovery is very much a part of
information security, even if it isn't the first
thing you think of. There's nothing more
annoying than being close to a new high score
on your favorite computer game when an
inconsiderate user calls up whining about a file
he needs restored. While mourning your dead
game avatar, you must rouse from the comfortable environs of your cubicle, find the appropriate tape, restore the file, inform the user, and
repeat the process when he decides he really
needed a version from a week earlier.
Stop the insanity! Get Microsoft System
Center Data Protection Manager (DPM), and
put users in control of their own restores—right
from Windows Explorer. After you install a
DPM server and the associated agent on your
file server, DPM periodically takes snapshots
of your server. It efficiently stores multiple versions of each file in its online Microsoft SQL
Server database. After you push out a necessary hotfix explained in the Microsoft article "How
to use the End User Recovery functionality
of Data Protection Manager in Windows XP"
(http://support.microsoft.com/kb/895536) to
your Windows XP clients, users will be able to
browse available backup versions of any file
on the server directly from Windows Explorer. To facilitate offsite backups of your data, DPM
lets you back up shadow copies of your file
servers from the DPM database, giving you a
disk-to-disk-to-tape backup scenario. To learn
more about DPM, go to http://www.microsoft.com
Patch Management
Patch Tuesday is many administrators' least
favorite day of the month. And zero-day vulnerabilities are rearing their ugly heads more
frequently between Patch Tuesdays. I have
three recommendations for making your
patch-management effort less of a nightmare:
- Life is too short to push out patches manually. Implement Windows Server Update
Services (WSUS) or another automated
patch-management solution. WSUS is free,
but many excellent ISV offerings go beyond
WSUS's functionality, providing broader
platform and application support and better manageability, including those from St.
Bernard Software, PatchLink, BigFix, Shavlik
Technologies, and ScriptLogic.
- Many administrators are reluctant to push
out a patch without testing it, but testing is time-consuming and annoying. In addition, the user community usually identifies
defective patches soon after their release.
Organizations with a small IT staff might
consider just sitting on patches a couple of
days and monitoring for any advisories or
revisions from Microsoft, then deploying
them without testing.
- An especially annoying type of vulnerability
is that for which no patch is available—zeroday vulnerabilities. Most zero-day exploits
are related either to a specific file type (e.g., .doc, .xls, .ppt, .bmp, .png) or to a Microsoft Internet Explorer (IE) ActiveX object. More
and more antivirus vendors quickly release
signature updates for file-format exploits
even though they aren't, strictly speaking,
viruses. If you cover your file-borne vectors
(principally email attachments and Web
downloads) with multiple antivirus engines, you'll often be protected against these fileborne zero-day exploits well ahead of patch
availability. The easiest way to address
ActiveX-related vulnerabilities is to set the
kill bit on the ActiveX control. I've created
an administrative template that you can use
with Group Policy to automatically set the
kill bit for an ActiveX control on thousands
of computers in a short time. The template
and a video demonstrating how to set it up
can be found at http://www.ultimatewindowssecurity.com/killbit.asp.
Take Action
In the case of many security annoyances,
the key is to automate or implement newer
technologies, but often such projects are put
off because of the initial setup involved or
the purchase costs. However, failing to solve
problems and automate tasks leads to a less
and less productive IT department that moves
in slower and slower motion, dragged down by
outdated, manual procedures. The IT department that succeeds in climbing the steep,
initial curve to eliminating IT headaches such
as those in this article will reap the benefits in
the long run. A few weekends at the office now
can save you many evenings and weekends in
the future.
Sorry about the broken link; it's fixed now.