Description

webpack-dev-server versions up to and including 5.2.3 are vulnerable to cross-origin source code exposure when serving over a non-potentially trustworthy origin such as plain HTTP. The previous fix relied on the Sec-Fetch-Mode and Sec-Fetch-Site request headers, which browsers omit for non-trustworthy origins, allowing a malicious site to load the bundled source as a script and read it across origins. Impact: an attacker controlling a website visited by a developer running webpack-dev-server can recover the application source code when the dev server runs over HTTP at a guessable host and port. Chromium based browsers from Chrome 142 onward are not affected due to local network access restrictions. Upgrade to webpack-dev-server 5.2.4 or later, which sets Cross-Origin-Resource-Policy: same-origin on responses.

Weaknesses 1

Affected Products 1

References 2

• cna.openjsf.org https://cna.openjsf.org/security-advisories.html
  Vendor Advisory
• github.com https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-79cf-xcqc-c78w
  MitigationVendor Advisory

Remediation