Advisory Details

August 13th, 2020

Microsoft Office OfficeClickToRun Time-Of-Check Time-Of-Use Privilege Escalation Vulnerability

ZDI-20-1000
ZDI-CAN-10974

CVE ID CVE-2020-1581
CVSS SCORE 7.8, AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Office
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
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