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Security Bulletin

	ZSB	Date	Title	Severity	CVE (if applicable)
	ZSB-21012	09/30/2021	Remote Code Execution against On-Prem Images via webportal	Medium	CVE-2021-34416
Severity: Medium CVSS Score: 5.5 CVSS Vector String: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N Description: The network address administrative settings web portal for the Zoom on-premise Meeting Connector before version 4.6.360.20210325, Zoom on-premise Meeting Connector MMR before version 4.6.360.20210325, Zoom on-premise Recording Connector before version 3.8.44.20210326, Zoom on-premise Virtual Room Connector before version 4.4.6752.20210326, and Zoom on-premise Virtual Room Connector Load Balancer before version 2.5.5495.20210326 fails to validate input sent in requests to update the network configuration, which could lead to remote command injection on the on-premise image by the web portal administrators. Affected Products: Zoom on-premise Meeting Connector before version 4.6.360.20210325 Zoom on-premise Meeting Connector MMR before version 4.6.360.20210325 Zoom on-premise Recording Connector before version 3.8.44.20210326 Zoom on-premise Virtual Room Connector before version 4.4.6752.20210326 Zoom on-premise Virtual Room Connector Load Balancer before version 2.5.5495.20210326 Source: Reported by Egor Dimitrenko of Positive Technologies
	ZSB-21011	09/30/2021	ZC crash using a PDU which causes many allocations	High	CVE-2021-34415
Severity: High CVSS Score: 7.5 CVSS Vector String: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Description: The Zone Controller service in the Zoom On-Premise Meeting Connector Controller before version 4.6.358.20210205 does not verify the cnt field sent in incoming network packets, which leads to exhaustion of resources and system crash. Affected Products: Zoom On-Premise Meeting Connector Controller before version 4.6.358.20210205 Source: Reported by Nikita Abramov of Positive Technologies
	ZSB-21010	09/30/2021	Remote Code Execution against Meeting Connector server via webportal network proxy configuration	Medium	CVE-2021-34414
Severity: Medium CVSS Score: 7.2 CVSS Vector String: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H Description: The network proxy page on the web portal for the Zoom on-premise Meeting Connector Controller before version 4.6.348.20201217, Zoom on-premise Meeting Connector MMR before version 4.6.348.20201217, Zoom on-premise Recording Connector before version 3.8.42.20200905, Zoom on-premise Virtual Room Connector before version 4.4.6620.20201110, and Zoom on-premise Virtual Room Connector Load Balancer before version 2.5.5495.20210326 fail to validate input sent in requests to update the network proxy configuration, which could lead to remote command injection on the on-premise image by a web portal administrator. Affected Products: Zoom on-premise Meeting Connector Controller before version 4.6.348.20201217 Zoom on-premise Meeting Connector MMR before version 4.6.348.20201217 Zoom on-premise Recording Connector before version 3.8.42.20200905 Zoom on-premise Virtual Room Connector before version 4.4.6620.20201110 Zoom on-premise Virtual Room Connector Load Balancer before version 2.5.5495.20210326 Source: Reported by Egor Dimitrenko of Positive Technologies
	ZSB-21009	09/30/2021	Zoom MacOS Outlook Plugin Installer Local Privilege Escalation	Low	CVE-2021-34413
Severity: Low CVSS Score: 2.8 CVSS Vector String: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N Description: All versions of the Zoom Plugin for Microsoft Outlook for MacOS before 5.3.52553.0918 contain a Time-of-check Time-of-use (TOC/TOU) vulnerability during the plugin installation process. This could allow a standard user to write their own malicious application to the plugin directory, allowing the malicious application to execute in a privileged context. Affected Products: All versions of the Zoom Plugin for Microsoft Outlook for MacOS before 5.3.52553.0918 Source: Reported by Patrick Murphy of Lockheed Martin
	ZSB-21008	09/30/2021	Zoom for Windows Installer Local Privilege Escalation	Medium	CVE-2021-34412
Severity: Medium CVSS Score: 4.4 CVSS Vector String: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N Description: During the installation process for all versions of the Zoom Client for Meetings for Windows before 5.4.0, it is possible to launch Internet Explorer. If the installer was launched with elevated privileges such as by SCCM this can result in a local privilege escalation. Affected Products: Zoom Client for Meetings for Windows before version 5.4.0 Source: Discovered by Patrick Murphy of Lockheed Martin
	ZSB-21007	09/30/2021	Zoom Rooms Installer Local Privilege Escalation	Medium	CVE-2021-34411
Severity: Medium CVSS Score: 4.4 CVSS Vector String: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N Description: During the installation process forZoom Rooms for Conference Room for Windows before version 5.3.0 it is possible to launch Internet Explorer with elevated privileges. If the installer was launched with elevated privileges such as by SCCM this can result in a local privilege escalation. Affected Products: Zoom Rooms for Conference Room for Windows before version 5.3.0 Source: Reported by Patrick Murphy of Lockheed Martin
	ZSB-21006	09/30/2021	Zoom Plugin for Microsoft Outlook (MacOS) Installer Root App Privilege Escalation	Medium	CVE-2021-34410
Severity: Medium CVSS Score: 6.6 CVSS Vector String: CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N/CR:X/IR:X/AR:X/MAV:L/MAC:L/MPR:L/MUI:R/MS:U/MC:X/MI:X/MA:X Description: A user-writable application bundle unpacked during the install for all versions of the Zoom Plugin for Microsoft Outlook for Mac before 5.0.25611.0521 allows for privilege escalation to root. Affected Products: Zoom Plugin for Microsoft Outlook for Mac before version 5.0.25611.0521 Source: Reported by Patrick Murphy of LockHeed Martin
	ZSB-21005	09/30/2021	MacOS Installer Privilege Escalation	High	CVE-2021-34409
Severity: High CVSS Score: 7.0 CVSS Vector String: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H Description: User-writable pre and post-install scripts unpacked during the Zoom Client for Meetings for MacOS installation before version 5.2.0 allow for privilege escalation to root. Affected Products: Zoom Client for Meetings for MacOS before version 5.2.0 Source: Reported by Patrick Murphy of Lockheed Martin
	ZSB-21004	09/30/2021	Zoom MSI Installer Elevated Write Using A Junction	High	CVE-2021-34408
Severity: High CVSS Score: 7.0 CVSS Vector String: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H Description: A user-writable directory created during the installation of the Zoom Client for Meetings for Windows version prior to version 5.3.2 can be redirected to another location using a junction. This would allow an attacker to overwrite files that a limited user would otherwise be unable to modify. Affected Products: Zoom Client for Meetings for Windows prior to version 5.3.2 Source: Discovered by Patrick Murphy of Lockheed Martin
	ZSB-21003	09/30/2021	Windows Zoom Installer Digital Signature Bypass	High	CVE-2021-33907
Severity: High CVSS Score: 7.0 CVSS Vector String: CVSS:3.0/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H/CR:H/IR:H/AR:H/MAV:L/MAC:H/MPR:N/MUI:R/MS:U/MC:H/MI:H/MA:H Description: The Zoom Client for Meetings for Windows in all versions before 5.3.0 fails to properly validate the certificate information used to sign .msi files when performing an update of the client. This could lead to remote code execution in an elevated privileged context. Affected Products: All versions of the Zoom Client for Meetings for Windows before version 5.3.0 Source: Discovered by Patrick Murphy of Lockheed Martin
	ZSB-21002	08/13/2021	Heap overflow from static buffer unchecked write from XMPP message	High	CVE-2021-30480
Severity: High CVSS Score: 8.1 CVSS Vector String: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/CR:H/IR:H/AR:H/MAV:N/MAC:H/MPR:N/MUI:N/MS:U/MC:H/MI:H/MA:H Description: A heap based buffer overflow exists in all desktop versions of the Zoom Client for Meetings before version 5.6.3. This Finding was reported to Zoom as a part of 2021 Pwn20wn Vancouver. The attack chain demonstrated during Pwn20wn was mitigated in a server-side change in Zoom’s infrastructure on 2021-04-09. When combined with two other issues reported during Pwn20wn - improper URL validation when sending an XMPP message to access a Zoom Marketplace app URL and incorrect URL validation when displaying a GIPHY image - a malicious user can achieve remote code execution on a target’s computer. The target must have previously accepted a Connection Request from the malicious user or be in a multi-user chat with the malicious user for this attack to succeed. The attack chain demonstrated in Pwn20wn can be highly visible to targets, causing multiple client notifications to occur. Affected Products: All desktop versions of the Zoom Client for Meetings before 5.6.3 Source: Reported by Daan Keuper and Thijs Alkemade from Computest via the Zero Day Initiative
	ZSB-21001	03/26/2021	Application Window Screen Sharing Functionality	Medium	CVE-2021-28133
Severity: Medium CVSS Score: 5.7 CVSS Vector String: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N Description: A vulnerability affected the Zoom Windows and Linux Clients’ share screen functionality when sharing individual application windows, in which screen contents of applications which are not explicitly shared by the screen-sharing users may be seen by other meeting participants for a brief moment if the “sharer” is minimizing, maximizing, or closing another window. Zoom introduced several new security mitigations in Zoom Windows Client version 5.6 that reduce the possibility of this issue occurring for Windows users. We are continuing to work on additional measures to resolve this issue across all affected platforms. Zoom also resolved the issue for Ubuntu users on March 1, 2021 in Zoom Linux Client version 5.5.4. Users can apply current updates or download the latest Zoom software with all current security updates from https://zoom.us/download. Affected Products: All Windows Zoom Client versions Linux Zoom Client versions prior to 5.5.4 on Ubuntu All Linux Client versions on other supported distributions Source: Discovered by Michael Stramez and Matthias Deeg.
	ZSB-20002	08/14/2020	Windows DLL in the Zoom Sharing Service	High	CVE-2020-9767
Severity: High CVSS Score: 7.8 CVSS Vector String: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Description: A vulnerability related to Dynamic-link Library (“DLL”) loading in the Zoom Sharing Service could allow a local Windows user to escalate privileges to those of the NT AUTHORITY/SYSTEM user. The vulnerability is due to insufficient signature checks of dynamically loaded DLLs when loading a signed executable. An attacker could exploit this vulnerability by injecting a malicious DLL into a signed Zoom executable and using it to launch processes with elevated permissions. Zoom addressed this issue in the 5.0.4 client release. Users can help keep themselves secure by applying current updates or downloading the latest Zoom software with all current security updates from https://zoom.us/download. Affected Products: Zoom Windows installer (ZoomInstallerFull.msi) versions prior to 5.0.4 Source: Connor Scott of Context Information Security
	ZSB-20001	05/04/2020	Zoom IT Installer for Windows	High	CVE-2020-11443
Severity: High CVSS Score: Base: 8.4 CVSS Vector String: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H Description: A vulnerability in how the Zoom Windows installer handles junctions when deleting files could allow a local Windows user to delete files otherwise not deletable by the user. The vulnerability is due to insufficient checking for junctions in the directory from which the installer deletes files, which is writable by standard users. A malicious local user could exploit this vulnerability by creating a junction in the affected directory that points to protected system files or other files to which the user does not have permissions. Upon running the Zoom Windows installer with elevated permissions, as is the case when it is run through managed deployment software, those files would get deleted from the system. Zoom addressed this issue in the 4.6.10 client release. Users can help keep themselves secure by applying current updates or downloading the latest Zoom software with all current security updates from https://zoom.us/download. Affected Products: Zoom Windows installer (ZoomInstallerFull.msi) versions prior to 4.6.10 Source: Thanks to the Lockheed Martin Red Team.
	ZSB-19003	07/12/2019	ZoomOpener daemon	High	CVE-2019-13567
Severity: High CVSS Score: Base: 7.5 CVSS Vector String: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Description: A vulnerability in the Zoom MacOS client could allow an attacker to download malicious software to a victim's device. The vulnerability is due to improper input validation and validation of downloaded software in the ZoomOpener helper application. An attacker could exploit the vulnerability to prompt a victim's device to download files on the attacker's behalf. A successful exploit is only possible if the victim previously uninstalled the Zoom Client. Zoom addressed this issue in the 4.4.52595.0425 client release. Users can help keep themselves secure by applying current updates or downloading the latest Zoom software with all current security updates from https://zoom.us/download. Affected Products: Zoom MacOS client prior to version 4.4.52595.0425 and after version 4.1.27507.0627 Source: Unknown.
	ZSB-19002	07/09/2019	Default Video Setting	Low	CVE-2019-13450
Severity: Low CVSS Score: Base: 3.1 CVSS Vector String: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N Description: A vulnerability in the MacOS Zoom and RingCentral clients could allow a remote, unauthenticated attacker to force a user to join a video call with the video camera active. The vulnerability is due to insufficient authorization controls to check which systems may communicate with the local Zoom Web server running on port 19421. An attacker could exploit this vulnerability by creating a malicious website that causes the Zoom client to automatically join a meeting set up by the attacker. Zoom implemented a new Video Preview dialog that is presented to the user before joining a meeting in Client version 4.4.5 published July 14, 2019. This dialog enables the user to join the meeting with or without video enabled and requires the user to set their desired default behavior for video. Zoom urges customers to install the latest Zoom Client release available at https://zoom.us/download. Affected Products: Zoom MacOS Client prior to version 4.4.5 RingCentral MacOS client prior to version 4.4.5 Source: Discovered by Jonathan Leitschuh.
	ZSB-19001	07/09/2019	Denial of service attack - MacOS	Low	CVE-2019-13449
Severity: Low CVSS Score: Base: 3.1 CVSS Vector String: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Description: A vulnerability in the MacOS Zoom client could allow a remote, unauthenticated attacker to trigger a denial-of-service condition on a victim's system. The vulnerability is due to insufficient authorization controls to check which systems may communicate with the local Zoom Web server running on port 19421. An attacker could exploit this vulnerability by creating a malicious website that causes the Zoom client to repeatedly try to join a meeting with an invalid meeting ID. The infinite loop causes the Zoom client to become inoperative and can impact performance of the system on which it runs. Zoom released version 4.4.2-hotfix of the MacOS client on April 28, 2019 to address the issue. Affected Products: Zoom MacOS Client prior to version 4.4.5 RingCentral MacOS client prior to version 4.4.5 Source: Discovered by Jonathan Leitschuh.
	ZSB-18001	11/30/2018	Unauthorized Message Processing	High	CVE-2018-15715
Severity: High CVSS Score: 7.4 CVSS Vector String: AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L/CR:X/IR:H/AR:H/MAV:X/MAC:X/MPR:X/MUI:X/MS:X/MC:X/MI:X/MA:X Description: A vulnerability in the Zoom client could allow a remote, unauthenticated attacker to control meeting functionality such as ejecting meeting participants, sending chat messages, and controlling participant microphone muting. If the attacker was also a valid participant in the meeting and another participant was sharing their desktop screen, the attacker could also take control of that participant’s keyboard and mouse. The vulnerability is due to the fact that Zoom's internal messaging pump dispatched both client User Datagram Protocol (UDP) and server Transmission Control Protocol (TCP) messages to the same message handler. An attacker can exploit this vulnerability to craft and send UDP packets which get interpreted as messages processed from the trusted TCP channel used by authorized Zoom servers. Zoom released client updates to address this security vulnerability. Users can help keep themselves secure by applying current updates or downloading the latest Zoom software with all current security updates from https://zoom.us/download. Affected Products: Windows clients before version 4.1.34460.1105 Mac clients before version 4.1.34475.1105 Linux clients before version 2.5.146186.1130 iOS clients before version 4.1.18 (4460.1105) Android clients before version 4.1.34489.1105 Chrome clients before version 3.3.1635.1130 Windows Zoom Room clients before version 4.1.6 (35121.1201) Mac Zoom Room clients before version 4.1.7 (35123.1201) Chrome Zoom Room clients before version 3.6.2895.1130 Windows Zoom SDK before version 4.1.30384.1029 Mac Zoom SDK before version 4.1.34180.1026 iOS Zoom SDK before version 4.1.34076.1024 Android Zoom SDK before version 4.1.34082.1024 Zoom Virtual Room Connectors before version 4.1.4813.1201 Zoom Meeting Connectors before version 4.3.135059.1129 Zoom Recording Connectors before version 3.6.58865.1130 The Zoom Cloud Skype for Business Connector was updated on 12/1/2018 The Zoom Cloud Conference Room Connector was updated on 12/6/2018 Source: David Wells from Tenable.
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