A vulnerability has been identified in Microsoft PowerPoint, whichcould be exploited by attackers to take complete control of an affectedsystem. This flaw is due to a memory corruption error in the "mso.dll"library when handling a malformed presentation, which could beexploited by attackers to execute arbitrary commands by tricking a userinto opening a specially crafted ".ppt" file.
Note : This zero-day vulnerability is currently being exploited in the wild by Trojan.PPDropper.B.