CVE-2021-34823
Critical
Description
The ON24 ScreenShare (aka DesktopScreenShare.app) plugin before 2.0 for macOS allows remote file access via its built-in HTTP server. This allows unauthenticated remote users to retrieve files accessible to the logged-on macOS user. When a remote user sends a crafted HTTP request to the server, it triggers a code path that will download a configuration file from a specified remote machine over HTTP. There is an XXE flaw in processing of this configuration file that allows reading local (to macOS) files and uploading them to remote machines.
SeverityCritical
CVSS9.1
Exploit probability81. percentile2%
ProductOn24 Screenshare
PublishedAug 13, 2021
First seenAug 13, 2021
How to fix
Update
- on24 screenshare2.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| on24 screenshare | v < 2.0 | 2.0 |
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