Heads up for Yahoo! Messenger users. McAfee Avert Labs Blog reports about a potential zero-day vulnerability for your favorite instant messenger. While no exploit is known or is in the wild, it always pays to be extra careful.

No details are available as of this time.

(Yes, I know, it is hard to be careful against something you do not know. There are ways in keeping yourself safe. Try using Web-based YM in the meantime. Or don’t click on links being sent via YM.)

UPDATE:

McAfee Avert Labs Blog has posted an update and has confirmed the existence of the vulnerability, which involves YM Web cam. They have posted the following mitigating measures:

1. Don’t accept webcam invites from untrusted sources until a patch for this is released.
2. It’s advisable to block outgoing traffic on TCP port 5100 until the vendor patches this vulnerability. (If unsure about port blocking, just follow number 1, above.)