Microsoft Windows Installer Service Time-Of-Check Time-Of-Use Local Privilege Escalation Vulnerability
Vulnerability Details
This vulnerability allows local attackers to escalate privileges on affected installations of Microsoft Windows. An attacker must first obtain the ability to execute low-privileged code on the target host system in order to exploit this vulnerability.
The specific flaw exists within the Windows Installer service. By creating a junction, an attacker can abuse the service to change permissions on an arbitrary file. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.
Additional Details
Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-32050
Disclosure Timeline
- 2022-07-22 - Vulnerability reported to vendor
- 2023-07-12 - Coordinated public release of advisory
Credit
JeongOh Kyea of THEORI
