CVEs-PoC/2021/CVE-2021-34823.md

### [CVE-2021-34823](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-34823)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brightgreen)

### 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.

### POC

#### Reference
- https://www.trustwave.com/en-us/resources/security-resources/security-advisories/
- https://www.trustwave.com/en-us/resources/security-resources/security-advisories/?fid=29105

#### Github
No PoCs found on GitHub currently.