Microsoft Office OfficeClickToRun Time-Of-Check Time-Of-Use Privilege Escalation Vulnerability
Vulnerability Details
This vulnerability allows local attackers to escalate privileges on affected installations of Microsoft Office. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.
The specific flaw exists within the OfficeClickToRun executable. The issue results from the lack of proper locking when performing operations on an object. An attacker can leverage this vulnerability to escalate privileges and execute code in the context of SYSTEM.
Additional Details
Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1581
Disclosure Timeline
- 2020-05-07 - Vulnerability reported to vendor
- 2020-08-13 - Coordinated public release of advisory
Credit
hackyzh and lm0963 of DBAppSecurity Zion Lab
