Apple Computer Inc. released this week a security patch for its Mac OS X (news - web sites) iChat instant messaging client, which contains a flaw that could a hacker could use to takeover a person's computer.

The flaw, rated "highly critical" by security research firm Secunia, affects iChat 1.0 and 2.1 and iChat AV 2.0.

"The problem is that links aren't properly validated before being opened," Secunia said in an advisory. "This can be exploited to launch programs be embedding references to local resources."

The iChat service enables instant messaging and video conferencing with America Online's AIM users.
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