Advisory Details

August 30th, 2023

Microsoft Teams Pluginhost Prototype Pollution Privilege Escalation Vulnerability

CVE ID
CVSS SCORE	7.5, AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS	Microsoft
AFFECTED PRODUCTS	Teams
VULNERABILITY DETAILS	This vulnerability allows remote attackers to escalate privileges on affected installations of Microsoft Teams. An attacker must first obtain the ability to execute script within the application window in order to exploit this vulnerability. The specific flaw exists within the Pluginhost window. The issue results from the lack of control over modifications to attributes of object prototypes. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the current process.
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/researcher-acknowledgments-online-services
DISCLOSURE TIMELINE	2023-05-19 - Vulnerability reported to vendor 2023-08-30 - Coordinated public release of advisory
CREDIT	Li Jiantao (@CurseRed), Ngo Wei Lin (@Creastery), Pan Zhenpeng (@Peterpan980927), Poh Jia Hao (@Chocologicall) of STAR Labs SG Pte. Ltd.

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