Advisory Details

August 17th, 2021

(Pwn2Own) Zoom Client GIPHY URL Directory Traversal Remote Code Execution Vulnerability

CVE ID
CVSS SCORE	5.3, AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
AFFECTED VENDORS	Zoom
AFFECTED PRODUCTS	Client
VULNERABILITY DETAILS	This vulnerability allows remote attackers to execute arbitrary code on affected installations of Zoom Clients. Authentication is not required to exploit this vulnerability. The specific flaw exists within the processing of GIPHY messages. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the current user.
ADDITIONAL DETAILS	Zoom has issued an update to correct this vulnerability. More details can be found at: https://explore.zoom.us/en/trust/security/security-bulletin/
DISCLOSURE TIMELINE	2021-04-07 - Vulnerability reported to vendor 2021-08-17 - Coordinated public release of advisory
CREDIT	Daan Keuper and Thijs Alkemade from Computest

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