Microsoft Security Response Center

Improper input validation in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.

Improper validation of specified type of input in Windows Authentication Methods allows an authorized attacker to elevate privileges locally.

Improper validation of specified type of input in Windows Authentication Methods allows an authorized attacker to elevate privileges locally.

**According to the CVSS metric, the attack vector is local (AV:L) and the privilege required is none (PR:L). What privileges could an attacker gain with successful exploitation?** A local user could take advantage of this vulnerability and perform elevation of privilege (EOP). By successfully exploiting this vulnerability, the attacker could elevate their privileges to obtain root level access on the virtual machine.

**According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?** A user interacting with the file in multiple ways will cause the NTLM hash to be leaked. A few interactions which trigger this leak include: * Opening the parent folder in Explorer * Clicking the file (any mouse button) * Dragging the file * Deleting the file

**How could an attacker exploit this vulnerability?** A remote, unauthenticated attacker could send a crafted event that triggers unsafe object deserialization in a legacy serialization mechanism, resulting in remote code execution.

**According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?** Successful exploitation of this vulnerability requires an attacker to win a race condition.

Exposure of sensitive information to an unauthorized actor in Microsoft Failover Cluster Virtual Driver allows an authorized attacker to disclose information locally.

Improper access control in Microsoft Windows Search Component allows an authorized attacker to deny service locally.

Use after free in Microsoft Office allows an unauthorized attacker to execute code locally.