Advisory Details

November 21st, 2022

(Pwn2Own) Microsoft Teams URL Allowlist Bypass Remote Code Execution Vulnerability

ZDI-22-1608
ZDI-CAN-17397

CVE ID
CVSS SCORE 6.3, (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L)
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Teams
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Microsoft Teams. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the enforcement of the allowlist for domains. The issue lies in improper verification of approved subdomains for content delivery. An attacker can leverage this vulnerability to execute code in the context of the current process at low integrity.

ADDITIONAL DETAILS

Fixed on August 31, 2022 https://msrc.microsoft.com/update-guide/acknowledgement/online


DISCLOSURE TIMELINE
  • 2022-05-25 - Vulnerability reported to vendor
  • 2022-11-21 - Coordinated public release of advisory
CREDIT Team DoubleDragon: Yonghwi Jin (@jinmo123) of Theori, Yongjin Kim (@adm1nkyj1) of Enki
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