CVE-2021-34823

CRITICAL

ON24 ScreenShare < 2.0 - Unauthenticated XML External Entity Injection via HTTP Server

Title source: llm
STIX 2.1

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 (2)

Core 2

Scores

CVSS v3 9.1
EPSS 0.0198
EPSS Percentile 77.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Details

CWE
CWE-611
Status published
Products (1)
on24/screenshare < 2.0
Published Aug 13, 2021
Tracked Since Feb 18, 2026