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CVE
PUBLISHED

CVE-2024-39698

Code Signing Bypass on Windows in electron-updater < 6.3.0-alpha.6

AssignerGitHub_M
Reserved2024-06-27
Published2024-07-09
Updated2024-07-10

Description

electron-updater allows for automatic updates for Electron apps. The file `packages/electron-updater/src/windowsExecutableCodeSignatureVerifier.ts` implements the signature validation routine for Electron applications on Windows. Because of the surrounding shell, a first pass by `cmd.exe` expands any environment variable found in command-line above. This creates a situation where `verifySignature()` can be tricked into validating the certificate of a different file than the one that was just downloaded. If the step is successful, the malicious update will be executed even if its signature is invalid. This attack assumes a compromised update manifest (server compromise, Man-in-the-Middle attack if fetched over HTTP, Cross-Site Scripting to point the application to a malicious updater server, etc.). The patch is available starting from 6.3.0-alpha.6.



HIGH: 7.5CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Problem types

CWE-154: Improper Neutralization of Variable Name Delimiters

Product status

< 6.3.0-alpha.6
affected

References

https://github.com/electron-userland/electron-builder/security/advisories/GHSA-9jxc-qjr9-vjxq

https://github.com/electron-userland/electron-builder/pull/8295

https://github.com/electron-userland/electron-builder/commit/ac2e6a25aa491c1ef5167a552c19fc2085cd427f

https://github.com/electron-userland/electron-builder/blob/140e2f0eb0df79c2a46e35024e96d0563355fc89/packages/electron-updater/src/windowsExecutableCodeSignatureVerifier.ts#L35-L41

cve.org CVE-2024-39698

nvd.nist.gov CVE-2024-39698

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