title: Electron subject to Exfiltration of hashed SMB credentials on Windows via file:// redirect
description: The Electron framework enables writing cross-platform desktop applications using JavaScript, HTML and CSS. In versions prior to 21.0.0-beta.1, 20.0.1, 19.0.11, and 18.3.7, Electron is vulnerable to Exposure of Sensitive Information. When following a redirect, Electron delays a check for redirecting to file:// URLs from other schemes. The contents of the file is not available to the renderer following the redirect, but if the redirect target is a SMB URL such as `file://some.website.com/`, then in some cases, Windows will connect to that server and attempt NTLM authentication, which can include sending hashed credentials.This issue has been patched in versions: 21.0.0-beta.1, 20.0.1, 19.0.11, and 18.3.7. Users are recommended to upgrade to the latest stable version of Electron. If upgrading isn't possible, this issue can be addressed without upgrading by preventing redirects to file:// URLs in the `WebContents.on('will-redirect')` event, for all WebContents as a workaround.
problem types: CWE-522: Insufficiently Protected Credentials
affected:
{
vendor: electron
product: electron
versions:
version: >= v21.0.0-nightly.20220526, < 21.0.0-beta.1, status: affected
version: >= 20.0.0-beta.1, < 20.0.1, status: affected
version: >= 19.0.0-beta.1, < 19.0.11, status: affected
version: < 18.3.7, status: affected
}
metrics:
cvssV3_1: [
version: 3.1
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:L
attackVector: NETWORK
attackComplexity: LOW
privilegesRequired: NONE
userInteraction: NONE
scope: CHANGED
confidentialityImpact: LOW
integrityImpact: NONE
availabilityImpact: LOW
baseScore: 7.2
baseSeverity: HIGH
]