An elevation of privilege vulnerability exists in Microsoft Office OLicenseHeartbeat task, where an attacker who successfully exploited this vulnerability could run this task as SYSTEM. To exploit the vulnerability, an authenticated attacker would need to place a specially crafted file in a specific location, thereby allowing arbitrary file corruption. The security update addresses the vulnerability by correcting how the process validates the log file.
Is the Preview Pane an attack vector for this vulnerability? No, the Preview Pane is not an attack vector.
Zhiniang Peng (@edwardzpeng) of Qihoo 360 Core security & Xuefeng Li