Exfiltration of hashed SMB credentials on Windows via file:// redirect
Impact
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.
Patches
This issue has been fixed in all current stable versions of Electron. Specifically, these versions contain the fixes:
- 21.0.0-beta.1
- 20.0.1
- 19.0.11
- 18.3.7
We recommend all apps upgrade to the latest stable version of Electron.
Workarounds
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:
app.on('web-contents-created', (e, webContents) => {
webContents.on('will-redirect', (e, url) => {
if (/^file:/.test(url)) e.preventDefault()
})
})For more information
If you have any questions or comments about this advisory, email us at security@electronjs.org.
Credit
Thanks to user @coolcoolnoworries for reporting this issue.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de npm | electron | < 18.3.7, >= 20.0.0-beta.1, < 20.0.1, >= 19.0.0-beta.1, < 19.0.11 | 18.3.7, 20.0.1, 19.0.11 |
Referencias
- Vector CVSS
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:L- Debilidad (CWE)
CWE-200, CWE-522- Plataforma
- npm
- Paquete
electron- Publicada
- 10.11.2022
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-p2jh-44qj-pf2v - CC BY 4.0
Historial de vulnerabilidades: electron
Todas las vulnerabilidades publicadas de este paquete (Paquete de npm), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 72
- Primera → última
- 10.2017 10.2026
- Sin corrección
- 0
- Explotada en ataques
- 3
Distribución por gravedad
- Crítica 3
- Alta 26
- Media 33
- Baja 10
Divulgaciones por año
- 2017: 1
- 2018: 5
- 2019: 0
- 2020: 6
- 2021: 2
- 2022: 7
- 2023: 6
- 2024: 0
- 2025: 3
- 2026: 42
-
Exfiltration of hashed SMB credentials on Windows via file:// redirect esta entrada
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