CVE-2021-34823 XML external entity in n/a
An XXE vulnerability in the ON24 ScreenShare plugin allows remote attackers to read local files via a crafted HTTP request.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-34823?
CVE-2021-34823 is a critical vulnerability in n/a, published on 13 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-611
Which versions are affected by CVE-2021-34823?
It affects 1 product.
Products include On24 Screenshare.
How do I fix CVE-2021-34823?
No fix has been published for CVE-2021-34823 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-34823 being exploited?
There is no known exploitation of CVE-2021-34823 in the wild and no public exploit code.
Sources
Also known as GHSA-ff42-ccp4-hwcv.