CVE-2021-34823

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.

CVSS v3 9.1 CRITICAL
CVSS v2.0 6.4 MEDIUM

9.1^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

6.4^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:L/Au:N/C:P/I:P/A:N

Exploitability : 10.0 / Impact : 4.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact NONE

References

Link	Resource
https://www.trustwave.com/en-us/resources/security-resources/security-advisories/	Third Party Advisory
https://www.trustwave.com/en-us/resources/security-resources/security-advisories/?fid=29105	Third Party Advisory
https://www.trustwave.com/en-us/resources/security-resources/security-advisories/	Third Party Advisory
https://www.trustwave.com/en-us/resources/security-resources/security-advisories/?fid=29105	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:on24:screenshare:*:*:*:*:*:macos:*:*

History

No history.

Information

Published : 2021-08-13 17:15

Updated : 2024-11-21 06:11

NVD link : CVE-2021-34823

Mitre link : CVE-2021-34823

CVE.ORG link : CVE-2021-34823

JSON object : View

Products Affected

on24

screenshare

CWE

CWE-611

Improper Restriction of XML External Entity Reference

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