electron-userland electron-builder up to 6.3.0-alpha.5 windowsExecutableCodeSignatureVerifier.ts verifySignature variable name delimiter

Summaryinfo

A vulnerability categorized as critical has been discovered in electron-userland electron-builder up to 6.3.0-alpha.5. This vulnerability affects the function verifySignature of the file packages/electron-updater/src/windowsExecutableCodeSignatureVerifier.ts. Executing a manipulation can lead to variable name delimiter. This vulnerability is tracked as CVE-2024-39698. The attack can be launched remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in electron-userland electron-builder up to 6.3.0-alpha.5 and classified as critical. This vulnerability affects the function verifySignature of the file packages/electron-updater/src/windowsExecutableCodeSignatureVerifier.ts. The manipulation with an unknown input leads to a variable name delimiter vulnerability. The CWE definition for the vulnerability is CWE-154. The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could be interpreted as variable name delimiters when they are sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2024-39698 since 06/27/2024. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

Upgrading to version 6.3.0-alpha.6 eliminates this vulnerability. Applying the patch ac2e6a25aa491c1ef5167a552c19fc2085cd427f is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• electron-userland

Name

• electron-builder

Version

• 6.3.0-alpha.0
• 6.3.0-alpha.1
• 6.3.0-alpha.2
• 6.3.0-alpha.3
• 6.3.0-alpha.4
• 6.3.0-alpha.5

License

• open-source

Website

• Product: https://github.com/electron-userland/electron-builder/

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