The jailbreak is available either on Cydia where you can get it by searching for p0sixspwn or by downloading the jailbreak software directly from here.
For iOS 7 jailbreak, you’d rather go to evasi0n7 jailbreak guide here.
Pod2g comments on the contribution:
Probably that you don’t understand when I say highly valuable. It’s something jailbreakers refused to use for years. Was found by @comex…
— pod2g (@pod2g) December 30, 2013
Nice! @winocm and @iH8sn0w burnt a highly valuable root exploit that would have worked for future iOS versions for a stupid 6.1.5 jailbreak.
— pod2g (@pod2g) December 30, 2013
So, what do you think about p0sixspwn?