An elevation of privilege vulnerability exists when the OneDrive for Windows Desktop application improperly handles symbolic links. An attacker who successfully exploited this vulnerability could overwrite a targeted file with an elevated status. To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and delete a targeted file with an elevated status. The update addresses this vulnerability by correcting where the OneDrive updater performs file writes while running with elevation.
Do I need to take any action to protect myself from this vulnerability? Most customers have been protected from this vulnerability because OneDrive has its own updater that periodically checks and updates the OneDrive binary. If your network is air-gapped, you can update the binary from the link in the Security Updates table. In which situations does this vulnerability apply? This vulnerability only applies when OneDrive is installed per machine and does not apply to the default per user install. Please see Per Machine Installation for more information. Which releases contain the updates to protect against the vulnerability? The update is in the following releases: 19.232.1124.0010 for Production ring 19.222.1110.0011 for Deferred ring
Zhiniang Peng (<a href="https://twitter.com/edwardzpeng">@edwardzpeng</a>) of Qihoo 360 Core security and Fangming Gu (@afang5472)