Security Breach Using Avatars?

I read this on Slashdot, and was wondering if this is a problem with WordPress themes that allow avatars with comments. If they use their own, would this come into play? Any thoughts?

“InfoWorld reports on a new potential ploy for stealing Web user’s private information: Researcher has found that by placing a new type of hybrid file on Web sites that let users upload their own images, they can circumvent security systems and take over Web surfers’ accounts. ‘They call this type of file a GIFAR, a contraction of GIF (graphics interchange format) and JAR (Java Archive), the two file-types that are mixed. At Black Hat, researchers will show attendees how to create the GIFAR while omitting a few key details to prevent it from being used immediately in any widespread attack.'”

I also posted this in Themes and templates.