Security Bulletin
Security Bulletin
| ZSB | Date | Title | Severity | CVE (if applicable) | |
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ZSB-22009 | 05/17/2022 | Insufficient hostname validation during server switch in Zoom Client for Meetings | Medium | CVE-2022-22787 |
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Severity: Medium CVSS Score: 5.9 CVSS Vector String: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:L
Description: The Zoom Client for Meetings (for Android, iOS, Linux, macOS, and Windows) before version 5.10.0 fails to properly validate the hostname during a server switch request. This issue could be used in a more sophisticated attack to trick an unsuspecting user’s client to connect to a malicious server when attempting to use Zoom services. Affected Products:
Source: Reported by Ivan Fratric of Google Project Zero |
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ZSB-22008 | 05/17/2022 | Update package downgrade in Zoom Client for Meetings for Windows | High | CVE-2022-22786 |
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Severity: High CVSS Score: 7.5 CVSS Vector String: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Description: The Zoom Client for Meetings for Windows before version 5.10.0 and Zoom Rooms for Conference Room for Windows before version 5.10.0, fails to properly check the installation version during the update process. This issue could be used in a more sophisticated attack to trick a user into downgrading their Zoom client to a less secure version. Affected Products:
Source: Reported by Ivan Fratric of Google Project Zero |
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ZSB-22007 | 05/17/2022 | Improperly constrained session cookies in Zoom Client for Meetings | Medium | CVE-2022-22785 |
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Severity: Medium CVSS Score: 5.9 CVSS Vector String: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:L
Description: The Zoom Client for Meetings (for Android, iOS, Linux, macOS, and Windows) before version 5.10.0 fails to properly constrain client session cookies to Zoom domains. This issue could be used in a more sophisticated attack to send a user’s Zoom-scoped session cookies to a non-Zoom domain. This could potentially allow for spoofing of a Zoom user. Affected Products:
Source: Reported by Ivan Fratric of Google Project Zero |
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ZSB- 22006 | 05/17/2022 | Improper XML Parsing in Zoom Client for Meetings | High | CVE-2022-22784 |
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Severity: High CVSS Score: 8.1 CVSS Vector String: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Description: The Zoom Client for Meetings (for Android, iOS, Linux, macOS, and Windows) before version 5.10.0 fails to properly parse XML stanzas in XMPP messages. This can allow a malicious user to break out of the current XMPP message context and create a new message context to have the receiving user’s client perform a variety of actions. This issue could be used in a more sophisticated attack to forge XMPP messages from the server. Affected Products:
Source: Reported by Ivan Fratric of Google Project Zero |
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ZSB- 22005 | 04/27/2022 | Process memory exposure in Zoom on-premise Meeting services | High | CVE-2022-22783 |
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Severity: High CVSS Score: 8.3 CVSS Vector String: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/CR:H
Description: A vulnerability in Zoom On-Premise Meeting Connector Controller version 4.8.102.20220310 and On-Premise Meeting Connector MMR version 4.8.102.20220310 exposes process memory fragments to connected clients, which could be observed by a passive attacker. Affected Products:
Source: Zoom Offensive Security Team |
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ZSB-22004 | 04/27/2022 | Local privilege escalation in Windows Zoom Clients | High | CVE-2022-22782 |
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Severity: High CVSS Score: 7.9 CVSS Vector String: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H
Description: The Zoom Client for Meetings for Windows prior to version 5.9.7, Zoom Rooms for Conference Room for Windows prior to version 5.10.0, Zoom Plugins for Microsoft Outlook for Windows prior to version 5.10.3, and Zoom VDI Windows Meeting Clients prior to version 5.9.6; was susceptible to a local privilege escalation issue during the installer repair operation. A malicious actor could utilize this to potentially delete system level files or folders, causing integrity or availability issues on the user’s host machine. Affected Products:
Source: Reported by the Zero Day Initiative |
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ZSB-22003 | 04/27/2022 | Update package downgrade in Zoom Client for Meetings for MacOS | High | CVE-2022-22781 |
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Severity: High CVSS Score: 7.5 CVSS Vector String: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Description: The Zoom Client for Meetings for MacOS (Standard and for IT Admin) prior to version 5.9.6 failed to properly check the package version during the update process. This could lead to a malicious actor updating an unsuspecting user’s currently installed version to a less secure version. Affected Products:
Source: Reported by Patrick Wardle of Objective-See |
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ZSB-22002 | 02/08/2022 | Zoom Chat Susceptible to Zip Bombing | Medium | CVE-2022-22780 |
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Severity: Medium CVSS Score: 4.7 CVSS Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:L
Description: The Zoom Client for Meetings chat functionality was susceptible to Zip bombing attacks in the following product versions: Android before version 5.8.6, iOS before version 5.9.0, Linux before version 5.8.6, macOS before version 5.7.3, and Windows before version 5.6.3. This could lead to availability issues on the client host by exhausting system resources. Affected Products:
Source: Reported by Johnny Yu of Walmart Global Tech |
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ZSB-22001 | 02/08/2022 | Retained exploded messages in Keybase clients for macOS and Windows | Low | CVE-2022-22779 |
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Severity: Low CVSS Score: 3.7 CVSS Vector String: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Description: The Keybase Clients for macOS and Windows before version 5.9.0 fails to properly remove exploded messages initiated by a user. This can occur if the receiving user switches to a non-chat feature and places the host in a sleep state before the sending user explodes the messages. This could lead to disclosure of sensitive information which was meant to be deleted from a user’s filesystem. Affected Products:
Source: Reported by Olivia O'Hara |
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ZSB-21022 | 12/14/2021 | Arbitrary command execution in Keybase Client for Windows | Medium | CVE-2021-34426 |
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Severity: Medium CVSS Score: 5.3 CVSS Vector String: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Description: A vulnerability was discovered in the Keybase Client for Windows before version 5.6.0 when a user executed the "keybase git lfs-config" command on the command-line. In versions prior to 5.6.0, a malicious actor with write access to a user’s Git repository could leverage this vulnerability to potentially execute arbitrary Windows commands on a user’s local system. Affected Products:
Source: Reported by RyotaK |
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ZSB-21021 | 12/14/2021 | Server Side Request Forgery in Zoom Client for Meetings chat | Medium | CVE-2021-34425 |
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Severity: Medium CVSS Score: 4.7 CVSS Vector String: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Description: The Zoom Client for Meetings before version 5.7.3 (for Android, iOS, Linux, macOS, and Windows) contain a server side request forgery vulnerability in the chat’s “link preview” functionality. In versions prior to 5.7.3, if a user were to enable the chat’s “link preview” feature, a malicious actor could trick the user into potentially sending arbitrary HTTP GET requests to URLs that the actor cannot reach directly. Affected Products:
Source: Reported by Johnny Yu of Walmart Global Tech |
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ZSB-21020 | 11/24/2021 | Process memory exposure in Zoom Client and other products | Medium | CVE-2021-34424 |
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Severity: Medium CVSS Score: 5.3 CVSS Vector String: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Description: A vulnerability was discovered in the products listed in the "Affected Products" section of this bulletin which potentially allowed for the exposure of the state of process memory. This issue could be used to potentially gain insight into arbitrary areas of the product’s memory. Affected Products:
Source: Reported by Natalie Silvanovich of Google Project Zero |
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ZSB-21019 | 11/24/2021 | Buffer overflow in Zoom Client and other products | High | CVE-2021-34423 |
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Severity: High CVSS Score: 7.3 CVSS Vector String: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Description: A buffer overflow vulnerability was discovered in the products listed in the “Affected Products'' section of this bulletin. This can potentially allow a malicious actor to crash the service or application, or leverage this vulnerability to execute arbitrary code. Affected Products:
Source: Source: Reported by Natalie Silvanovich of Google Project Zero |
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ZSB-21018 | 11/09/2021 | Path traversal of file names in Keybase Client for Windows | High | CVE-2021-34422 |
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Severity: High CVSS Score: 7.2 CVSS Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Description: The Keybase Client for Windows before version 5.7.0 contains a path traversal vulnerability when checking the name of a file uploaded to a team folder. A malicious user could upload a file to a shared folder with a specially crafted file name which could allow a user to execute an application which was not intended on their host machine. If a malicious user leveraged this issue with the public folder sharing feature of the Keybase client, this could lead to remote code execution. Affected Products:
Source: Reported by m4t35z |
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ZSB-21017 | 11/09/2021 | Retained exploded messages in Keybase clients for Android and iOS | Low | CVE-2021-34421 |
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Severity: Low CVSS Score: 3.7 CVSS Vector String: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Description: The Keybase Client for Android before version 5.8.0 and the Keybase Client for iOS before version 5.8.0 fails to properly remove exploded messages initiated by a user if the receiving user places the chat session in the background while the sending user explodes the messages. This could lead to disclosure of sensitive information which was meant to be deleted from the customer’s device. Affected Products:
Source: Reported by Olivia O'Hara, John Jackson, Jackson Henry, and Robert Willis |
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ZSB-21016 | 11/09/2021 | Zoom Windows installation executable signature bypass | Medium | CVE-2021-34420 |
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Severity: Medium CVSS Score: 4.7 CVSS Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
Description: The Zoom Client for Meetings for Windows installer before version 5.5.4 does not properly verify the signature of files with .msi, .ps1, and .bat extensions. This could lead to a malicious actor installing malicious software on a customer’s computer. Affected Products:
Source: Reported by Laurent Delosieres of ManoMano |
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ZSB-21015 | 11/09/2021 | HTML injection in Zoom Linux client | Low | CVE-2021-34419 |
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Severity: Low CVSS Score: 3.7 CVSS Vector String: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Description: In the Zoom Client for Meetings for Ubuntu Linux before version 5.1.0, there is an HTML injection flaw when sending a remote control request to a user in the process of in-meeting screen sharing. This could allow meeting participants to be targeted for social engineering attacks. Affected Products:
Source: Reported by Danny de Weille and Rick Verdoes of hackdefense |
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ZSB-21014 | 11/09/2021 | Pre-auth Null pointer crash in on-premise web console | Medium | CVE-2021-34418 |
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Severity: Medium CVSS Score: 4.0 CVSS Vector String: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Description: The login service of the web console for the products listed in the “Affected Products” section of this bulletin, fails to validate that a NULL byte was sent while authenticating. This could lead to a crash of the login service. Affected Products:
Source: Reported by Jeremy Brown |
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ZSB-21013 | 11/09/2021 | Authenticated remote command execution with root privileges via web console in MMR | High | CVE-2021-34417 |
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Severity: High CVSS Score: 7.9 CVSS Vector String: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N Description: The network proxy page on the web portal for the products listed in the “Affected Products” section of this bulletin, fails to validate input sent in requests to set the network proxy password. This could lead to remote command injection by a web portal administrator. Affected Products:
Source: Reported by Jeremy Brown |
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ZSB-21012 | 09/30/2021 | Remote Code Execution against On-Prem Images via webportal | Medium | CVE-2021-34416 |
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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:
Source: Reported by Egor Dimitrenko of Positive Technologies |
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ZSB-21011 | 09/30/2021 | ZC crash using a PDU which causes many allocations | High | CVE-2021-34415 |
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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:
Source: Reported by Nikita Abramov of Positive Technologies |
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ZSB-21010 | 09/30/2021 | Remote Code Execution against Meeting Connector server via webportal network proxy configuration | Medium | CVE-2021-34414 |
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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:
Source: Reported by Egor Dimitrenko of Positive Technologies |
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ZSB-21009 | 09/30/2021 | Zoom MacOS Outlook Plugin Installer Local Privilege Escalation | Low | CVE-2021-34413 |
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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:
Source: Reported by the Lockheed Martin Red Team |
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ZSB-21008 | 09/30/2021 | Zoom for Windows Installer Local Privilege Escalation | Medium | CVE-2021-34412 |
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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:
Source: Reported by the Lockheed Martin Red Team |
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ZSB-21007 | 09/30/2021 | Zoom Rooms Installer Local Privilege Escalation | Medium | CVE-2021-34411 |
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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:
Source: Reported by the Lockheed Martin Red Team |
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ZSB-21006 | 09/30/2021 | Zoom Plugin for Microsoft Outlook (MacOS) Installer Root App Privilege Escalation | Medium | CVE-2021-34410 |
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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:
Source: Reported by the Lockheed Martin Red Team |
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ZSB-21005 | 09/30/2021 | Zoom Client Installer Local Privilege Escalation | High | CVE-2021-34409 |
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Severity: High CVSS Score: 7.8 CVSS Vector String: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Description: It was discovered that the installation packages of the Zoom Client for Meetings for MacOS (Standard and for IT Admin) installation before version 5.2.0, Zoom Client Plugin for Sharing iPhone/iPad before version 5.2.0, and Zoom Rooms for Conference before version 5.1.0, copy pre- and post- installation shell scripts to a user-writable directory. In the affected products listed below, a malicious actor with local access to a user's machine could use this flaw to potentially run arbitrary system commands in a higher privileged context during the installation process. Affected Products:
Source: Reported by the Lockheed Martin Red Team |
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ZSB-21004 | 09/30/2021 | Zoom MSI Installer Elevated Write Using A Junction | High | CVE-2021-34408 |
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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:
Source: Reported by the Lockheed Martin Red Team |
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ZSB-21003 | 09/30/2021 | Windows Zoom Installer Digital Signature Bypass | High | CVE-2021-33907 |
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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:
Source: Reported by the Lockheed Martin Red Team |
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ZSB-21002 | 08/13/2021 | Heap overflow from static buffer unchecked write from XMPP message | High | CVE-2021-30480 |
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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. Affected Products:
Source: Reported by Daan Keuper and Thijs Alkemade from Computest via the Zero Day Initiative |
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ZSB-21001 | 03/26/2021 | Application Window Screen Sharing Functionality | Medium | CVE-2021-28133 |
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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. Affected Products:
Source: Discovered by Michael Stramez and Matthias Deeg. |
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ZSB-20002 | 08/14/2020 | Windows DLL in the Zoom Sharing Service | High | CVE-2020-9767 |
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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. Affected Products:
Source: Connor Scott of Context Information Security |
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ZSB-20001 | 05/04/2020 | Zoom IT Installer for Windows | High | CVE-2020-11443 |
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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. Affected Products:
Source: Thanks to the Lockheed Martin Red Team. |
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ZSB-19003 | 07/12/2019 | ZoomOpener daemon | High | CVE-2019-13567 |
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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. Affected Products:
Source: Unknown. |
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ZSB-19002 | 07/09/2019 | Default Video Setting | Low | CVE-2019-13450 |
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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. Affected Products:
Source: Discovered by Jonathan Leitschuh. |
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ZSB-19001 | 07/09/2019 | Denial of service attack - MacOS | Low | CVE-2019-13449 |
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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. Affected Products:
Source: Discovered by Jonathan Leitschuh. |
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ZSB-18001 | 11/30/2018 | Unauthorized Message Processing | High | CVE-2018-15715 |
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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. Affected Products:
Source: David Wells from Tenable. |
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