This is a thorough analysis of the Microsoft XML core services uninitialized memory vulnerability as noted by CVE-2012-1889. It includes proof of concept data to trigger the issue and goes through the flow.
You can download it from the following link: https://packetstormsecurity.com/files/download/114488/CVE-2012-1889.pdf
Source: https://packetstormsecurity.com/files/114488/Microsoft-XML-Core-Services-Uninitialized-Memory.html