CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
27.3%
The file packages/electron-updater/src/windowsExecutableCodeSignatureVerifier.ts
implements the signature validation routine for Electron applications on Windows. It executes the following command in a new shell (process.env.ComSpec
on Windows, usually C:\Windows\System32\cmd.exe
):
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.).
This vulnerability was patched in #8295, by comparing the path in the output of Get-AuthenticodeSignature
with the intended one. The patch is available starting from 6.3.0-alpha.6.
github.com/electron-userland/electron-builder
github.com/electron-userland/electron-builder/blob/140e2f0eb0df79c2a46e35024e96d0563355fc89/packages/electron-updater/src/windowsExecutableCodeSignatureVerifier.ts#L35-L41
github.com/electron-userland/electron-builder/commit/ac2e6a25aa491c1ef5167a552c19fc2085cd427f
github.com/electron-userland/electron-builder/pull/8295
github.com/electron-userland/electron-builder/security/advisories/GHSA-9jxc-qjr9-vjxq
nvd.nist.gov/vuln/detail/CVE-2024-39698
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
27.3%