CVE-2021-34823

KRITISCH 9.1CVE-2021-34823 · Published 13/08/2021 · updated 17/06/2026

Kurz gesagt

CVE-2021-34823 ist eine Schwachstelle (KRITISCH (CVSS 9.1)) in screenshare (on24).
Wahrscheinlichkeit einer Ausnutzung in den nächsten 30 Tagen (EPSS): 2.0%, höher als bei 80.6% aller Schwachstellen.
Abhilfe: auf 2.0 oder neuer aktualisieren.

Package	Affected versions	Patched versions
screenshare on24	`< 2.0`	`2.0`

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.

References

trustwave.com/en-us/resources/security-resources/security-advisories · Third Party Advisory
trustwave.com/en-us/resources/security-resources/security-advisories · Third Party Advisory

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