GEN:SID 1:2457
Message CHAT Yahoo IM message
Summary This event is generated when a host in your network that has Yahoo Instant Messenger sends or receives a Yahoo Instant Messenger message.
Impact Possible policy violation.  Instant Messenger programs may not be appropriate in certain network environments.
Detailed Information Yahoo IM provides a means of allowing an interactive message exchange between user.  While there are no known exploits associated with exchanging messages, this type of activity may not be appropriate in certain network environments.  Also, since all exchanges are done via Yahoo IM servers and in clear text, there should be no expectation of privacy.
Affected Systems Any host running Yahoo Instant Messenger.
Attack Scenarios No known attacks.
Ease of Attack No known attacks.
Corrective Action Disallow the use of IM clients on the protected network and enforce or implement an organization wide policy on the use of IM clients.
Additional References