Fixing Common Zoom Video Conferencing App Problems
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Click the link above to download Zoom. Send along with the file. Then double-click on the file you want to convert. Let us know if you managed to. Source : Reported by Jeremy Brown.
This could lead to remote command injection by a web portal administrator. Description : The network address administrative settings web portal for the Zoom on-premise Meeting Connector before version 4. Description : The network proxy page on the web portal for the Zoom on-premise Meeting Connector Controller before version 4. 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.
Description : During the installation process for all versions of the Zoom Client for Meetings for Windows before 5. If the installer was launched with elevated privileges such as by SCCM this can result in a local privilege escalation. Description : A user-writable application bundle unpacked during the install for all versions of the Zoom Plugin for Microsoft Outlook for Mac before 5. Description : A user-writable directory created during the installation of the Zoom Client for Meetings for Windows version prior to version 5.
This would allow an attacker to overwrite files that a limited user would otherwise be unable to modify. This could lead to remote code execution in an elevated privileged context. Description : A heap based buffer overflow exists in all desktop versions of the Zoom Client for Meetings before version 5. This Finding was reported to Zoom as a part of Pwn20wn Vancouver. 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.
Zoom introduced several new security mitigations in Zoom Windows Client version 5. We are continuing to work on additional measures to resolve this issue across all affected platforms. 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.
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. The vulnerability is due to improper input validation and validation of downloaded software in the ZoomOpener helper application. A successful exploit is only possible if the victim previously uninstalled the Zoom Client. 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 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. 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.
Source : Discovered by Jonathan Leitschuh. 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. 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. 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. Source : David Wells from Tenable. Security Bulletin.
Alternatively, you might see error code during installation. Now, you just need to reinstall Zoom. You can get the latest version from the Zoom Download Center. First, check that you have enough disk space. Look at how much space you have left on the drive where you are installing Zoom. If necessary, replace C with the drive you have Zoom installed on. Then click OK. In the folder that opens, you should see a file called installer. Attach this to a ticket on the Zoom Support site for further assistance.
This error can happen during installation and is caused either by incorrect permissions or a driver conflict. First, you need to run the Zoom installer as an administrator.
Right-click the EXE file and choose Run as administrator. Then follow the standard installation process. You can use Windows Update to check for driver updates:. If you need more help, see our guide on how to find and replace drivers. It you see this, it means that you have not been granted the correct license to join the webinar. The host needs to visit Zoom User Management as an account owner or admin.
Here they can grant you the correct permissions to join the webinar, or find out how to renew their webinar license if applicable. Hopefully you now have Zoom up and running. If not, visit the Zoom support site for more resources and contact information.
This issue could be used in a more sophisticated attack to trick a user into downgrading their Zoom client to a less secure version. This could potentially allow for spoofing of a Zoom user. This issue could be used in a more sophisticated attack to forge XMPP messages from the server. Users can help keep themselves secure by applying current updates or downloading the latest Zoom software with all current security updates. Source : Zoom Offensive Security Team.
Source : Reported by the Zero Day Initiative. Description : The Zoom Client for Meetings chat functionality was susceptible to Zip bombing attacks in the following product versions: Android before version 5.
This could lead to availability issues on the client host by exhausting system resources. 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. Description : A vulnerability was discovered in the Keybase Client for Windows before version 5.
In versions prior to 5. Description : The Zoom Client for Meetings before version 5. Zoom has addressed this issue in the latest releases of the products listed in the section below.
This can potentially allow a malicious actor to crash the service or application, or leverage this vulnerability to execute arbitrary code. Description : The Keybase Client for Windows before version 5. 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.
Keybase addressed this issue in the 5. Description : The Keybase Client for Android before version 5. Zoom addressed this issue in the 5. This could allow meeting participants to be targeted for social engineering attacks. This could lead to a crash of the login service. Severity All. CVE All. Affected Products : Keybase Client for Windows before version 5. Affected Products : Zoom on-premise Meeting Connector before version 4. Affected Products : Windows clients before version 4. Insufficient hostname validation during server switch in Zoom Client for Meetings.
Update package downgrade in Zoom Client for Meetings for Windows. Improperly constrained session cookies in Zoom Client for Meetings. Process memory exposure in Zoom on-premise Meeting services. Retained exploded messages in Keybase clients for macOS and Windows. Arbitrary command execution in Keybase Client for Windows. Process memory exposure in Zoom Client and other products. Path traversal of file names in Keybase Client for Windows.
Retained exploded messages in Keybase clients for Android and iOS.
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