Electron: Sandboxed preload code cache can be poisoned by a compromised renderer

Impact

The cache Electron keeps for sandboxed preload scripts did not verify that a cached entry matched the preload it was served for. A compromised renderer could use this to run its own code in the preload context on a later load.

Apps are only affected if they load untrusted content. Apps that do not load untrusted content are not affected.

Workarounds

There are no app side workarounds, you must update to a patched version of Electron.

Fixed Versions

• 44.0.0-beta.6
• 43.5.0
• 42.10.0

For more information

If you have any questions or comments about this advisory, email us at [email protected]