CVE-2021-39184 - CVE House

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Status published Medium CVE-2021-39184

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

6.8 CVSS

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

More from electron

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Electron is vulnerable to Code Injection via resource modification

Electron Vulnerable to Heap Buffer Overflow in NativeImage::CreateFromPath

Electron ASAR Integrity bypass by just modifying the content

@electron/packager's build process memory potentially leaked into final executable

ASAR Integrity bypass via filetype confusion in electron

Affected Vendor

electron

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Affected Software

electron

Vulnerable Versions:

< 11.5.0, >= 12.0.0, < 12.1.0, >= 13.0.0, < 13.3.0

Timeline

Official Publish: October 12th, 2021

Last Modified: August 4th, 2024

Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

Weaknesses (CWE)

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application

T1213 Data from Information Repositories

T1005 Data from Local System

T1078 Valid Accounts