Only a few weeks after the 4.3.1 untether created by @i0n1c was released, Apple pushed out firmware 4.3.2. Thankfully, it appears Apple didn’t have a chance to fix the hole used by @i0n1c’s untether, so he ported his code over to 4.3.2’s kernel. Today’s redsn0w has been updated to include it.
The 4.3.2 untether works on all devices that actually support 4.3.2 except for the iPad2:
  • iPhone3GS
  • iPhone4 (GSM)
  • iPod touch 3G
  • iPod touch 4G
  • iPad1

redsn0w 0.9.6rc13:
  • Windows redsn0w

As always, ultrasn0w unlockers should stay away from redsn0w and only update their firmware through a custom IPSW. We’ll release a new version of PwnageTool sometime this week.
Click here to enlarge

Note that many people are currently having problems updating to 4.3.2 through saurik’s server. You’ll need to remove the gs.apple.com entry in your hosts file in order to restore directly to Apple’s servers.