This exploit in the S5L8900 bootrom is really the ultimate exploit, since it allows unsigned code to be run at the lowest level. It is available in all devices that use the S5L8900 - the iPhone, iPod Touch and iPhone 3G. It is also available on some non-iOS iPods.
This section needs expansion with: details of the exploit. You can help by adding to it. (March 2023)
There is a stack overflow in the certificate parsing code. By passing a malformed certificate, unsigned code can be run.
- Pwnage 2.0 on freemyipod.org