CVE-2021-39184
Electron's sandboxed renderers can obtain thumbnails of arbitrary files through the nativeImage API
Description
### Impact This vulnerability allows a sandboxed renderer to request a "thumbnail" image of an arbitrary file on the user's system. The thumbnail can potentially include significant parts of the original file, including textual data in many cases. All current stable versions of Electron are affected. ### Patches This was fixed with #30728, and the following Electron versions contain the fix: - 15.0.0-alpha.10 - 14.0.0 - 13.3.0 - 12.1.0 - 11.5.0 ### Workarounds If your app enables `contextIsolation`, this vulnerability is significantly more difficult for an attacker to exploit. Further, if your app does not depend on the `createThumbnailFromPath` API, then you can simply disable the functionality. In the main process, before the 'ready' event: ```js delete require('electron').nativeImage.createThumbnailFromPath ``` ### For more information If you have any questions or comments about this advisory, email us at [security@electronjs.org](mailto:security@electronjs.org).
How to fix CVE-2021-39184
To remediate CVE-2021-39184, upgrade the affected package to a fixed version below.
- —upgrade to 11.5.0 or later
Is CVE-2021-39184 being exploited?
Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 11.5.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N |