Advisories for Npm/@Theia/Mini-Browser package

The @theia/plugin-ext component of Eclipse Theia, Webview contents can be hijacked via postMessage().

In Eclipse Theia to, the mini-browser extension allows a user to preview HTML files in an iframe inside the IDE. But with the way it is made it is possible for a previewed HTML file to trigger an RCE. This exploit only happens if a user previews a malicious file.

In Eclipse Theia versions 0.3.9 through 0.15.0, one of the default pre-packaged Theia extensions is "Mini-Browser", published as "@theia/mini-browser" on npmjs.com. This extension, for its own needs, exposes a HTTP endpoint that allows to read the content of files on the host's filesystem, given their path, without restrictions on the requester's origin. This design is vulnerable to being exploited remotely through a DNS rebinding attack or a drive-by download of …

In Eclipse Theia versions up to and including, in the notification messages there is no HTML escaping, so Javascript code can run.

In Eclipse Theia versions up to and including, in the debug console there is no HTML escaping, so arbitrary Javascript code can be injected.