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THREATINT
PUBLISHED

CVE-2021-39184

Sandboxed renderers can obtain thumbnails of arbitrary files through the nativeImage API



AssignerGitHub_M
Reserved2021-08-16
Published2021-10-12
Updated2024-08-04

Description

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. A vulnerability in versions prior to 11.5.0, 12.1.0, and 13.3.0 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. Versions 15.0.0-alpha.10, 14.0.0, 13.3.0, 12.1.0, and 11.5.0 all contain a fix for the vulnerability. Two workarounds aside from upgrading are available. One may make the vulnerability significantly more difficult for an attacker to exploit by enabling `contextIsolation` in one's app. One may also disable the functionality of the `createThumbnailFromPath` API if one does not need it.



MEDIUM: 6.8CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

Product status

< 11.5.0
affected

>= 12.0.0, < 12.1.0
affected

>= 13.0.0, < 13.3.0
affected

References

https://github.com/electron/electron/security/advisories/GHSA-mpjm-v997-c4h4

https://github.com/electron/electron/pull/30728

cve.org CVE-2021-39184

nvd.nist.gov CVE-2021-39184

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