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Cyber Security Tip ST04-011
Using Instant Messaging and Chat Rooms Safely
Although they offer a convenient way to communicate with other
people, there
are dangers associated with tools that allow real-time communication.
What are the differences between some of the tools used for real-time
communication?
* Instant messaging (IM) - Commonly used for recreation, instant
messaging
is also becoming more widely used within corporations for
communication
between employees. IM, regardless of the specific software you
choose,
provides an interface for individuals to communicate one-on-one.
* Chat rooms - Whether public or private, chat rooms are forums for
particular groups of people to interact. Many chat rooms are
based upon
a shared characteristic; for example, there are chat rooms for
people of
particular age groups or interests. Although most IM clients support
"chats" among multiple users, IM is traditionally one-to-one
while chats
are traditionally many-to-many.
* Bots - A "chat robot," or "bot," is software that can interact with
users through chat mechanisms, whether in IM or chat rooms. In some
cases, users may be able to obtain current weather reports, stock
status, or movie listings. In these instances, users are often aware
that they are not interacting with an actual human. However,
some users
may be fooled by more sophisticated bots into thinking the responses
they are receiving are from another person.
There are many software packages that incorporate one or more of these
capabilities. A number of different technologies might be supported,
including IM, Internet Relay Chat (IRC), or Jabber.
What are the dangers?
* Identities can be elusive or ambiguous - Not only is it sometimes
difficult to identify whether the "person" you are talking to is
human,
but human nature and behavior isn't predictable. People may lie
about
their identity, accounts may be compromised, users may forget to log
out, or an account may be shared by multiple people. All of
these things
make it difficult to know who you're really talking to during a
conversation.
* Users are especially susceptible to certain types of attack -
Trying to
convince someone to run a program or click on a link is a common
attack
method, but it can be especially effective through IM and chat
rooms. In
a setting where a user feels comfortable with the "person" he or
she is
talking to, a malicious piece of software or an attacker has a
better
chance of convincing someone to fall into the trap (see Avoiding
Social
Engineering and Phishing Attacks for more information).
* You don't know who else might be seeing the conversation - Online
interactions are easily saved, and if you're using a free commercial
service the exchanges may be archived on a server. You have no
control
over what happens to those logs. You also don't know if there's
someone
looking over the shoulder of the person you're talking to, or if an
attacker might be "sniffing" your conversation.
* The software you're using may contain vulnerabilities - Like any
other
software, chat software may have vulnerabilities that attackers can
exploit.
* Default security settings may be inappropriate - The default
security
settings in chat software tend to be relatively permissive to
make it
more open and "usable," and this can make you more susceptible to
attacks.
How can you use these tools safely?
* Evaluate your security settings - Check the default settings in your
software and adjust them if they are too permissive. Make sure to
disable automatic downloads. Some chat software offers the
ability to
limit interactions to only certain users, and you may want to take
advantage of these restrictions.
* Be conscious of what information you reveal - Be wary of revealing
personal information unless you know who you are really talking
to. You
should also be careful about discussing anything you or your
employer
might consider sensitive business information over public IM or chat
services (even if you are talking to someone you know in a
one-to-one
conversation).
* Try to verify the identity of the person you are talking to, if it
matters - In some forums and situations, the identity of the
"person"
you are talking to may not matter. However, if you need to have
a degree
of trust in that person, either because you are sharing certain
types of
information or being asked to take some action like following a
link or
running a program, make sure the "person" you are talking to is
actually
that person.
* Don't believe everything you read - The information or advice you
receive in a chat room or by IM may be false or, worse,
malicious. Try
to verify the information or instructions from outside sources
before
taking any action.
* Keep software up to date - This includes the chat software, your
browser, your operating system, your mail client, and,
especially, your
anti-virus software (see Understanding Patches and Understanding
Anti-Virus Software for more information).
_________________________________________________________________
Authors: Mindi McDowell, Allen Householder
_________________________________________________________________
Produced 2004 by US-CERT, a government organization.
Note: This tip was previously published and is being
re-distributed to increase awareness.
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