Content-Secrity-Policy disabling eval not applied consistently in renderers with sandbox disabled in Electron

Open Source Vulnerabilities GHSA-gxh7-wv9q-fwfr

### Impact A Content-Security-Policy that disables eval, specifically setting a `script-src` directive and _not_ providing `unsafe-eval` in that directive, is not respected in renderers that have sandbox and contextIsolation disabled. i.e. `sandbox: false` and `contextIsolation: false` in the `webPreferences` object. This resulted in incorrectly allowing usage of methods like `eval()` and `new Function`, which can result in an expanded attack surface. ### Patches This issue only ever affected the 22 and 23 major versions of Electron and has been fixed in the latest versions of those release lines. Specifically, these versions contain the fixes: - 22.0.1 - 23.0.0-alpha.2 We recommend all apps upgrade to the latest stable version of Electron, especially if they use `sandbox: false` or `contextIsolation: false`. ### Workarounds If upgrading isn't possible, this issue can be addressed without upgrading by enabling at least one of `sandbox: true` or `contextIsolation: true` on all renderers. ```js const mainWindow = new BrowserWindow({ webPreferences: { sandbox: true, } }); ``` ### For more information If you have any questions or comments about this advisory, email us at [[email protected]](mailto:[email protected]). ### Credit Thanks to user @andreasdj for reporting this issue.

Open Source Vulnerabilities CVE-2023-23623

Electron is a framework which lets you write cross-platform desktop applications using JavaScript, HTML and CSS. A Content-Security-Policy that disables eval, specifically setting a `script-src` directive and _not_ providing `unsafe-eval` in that directive, is not respected in renderers that have sandbox disabled. i.e. `sandbox: false` in the `webPreferences` object. This allows usage of methods like `eval()` and `new Function` unexpectedly which can result in an expanded attack surface. This issue only ever affected the 22 and 23 major versions of Electron and has been fixed in the latest versions of those release lines. Specifically, these versions contain the fixes: 22.0.1 and 23.0.0-alpha.2 We recommend all apps upgrade to the latest stable version of Electron. If upgrading isn't possible, this issue can be addressed without upgrading by enabling `sandbox: true` on all renderers.