Found this at
http://www.securityfocus.com/bid/17730/exploit
It's a "LibTiff Multiple Denial of Service Proof Of Concept"
What's interesting is.. it freezes my psp, which is on 2.70, and it probably works on 2.01+.
I've attached a Rar file, so feel free to look at it.
Just extract the folder named "Tiff" into the photo folder of your PSP and view it. Watch it freeze and shut off after 10 seconds or so.
Should work for you too... Whomever has a 2.7.
This is just general PSP stuff.
Yep...