CVE-2024-29180 Information

Description

Prior to versions 7.1.0 6.1.2 and 5.3.4 the webpack-dev-middleware development middleware for devpack does not validate the supplied URL address sufficiently before returning the local file. It is possible to access any file on the developer’s machine. The middleware can either work with the physical filesystem when reading the files or it can use a virtualized in-memory memfs filesystem. If writeToDisk configuration option is set to true the physical filesystem is used. The getFilenameFromUrl method is used to parse URL and build the local file path. The public path prefix is stripped from the URL and the unsecaped path suffix is appended to the outputPath. As the URL is not unescaped and normalized automatically before calling the midlleware it is possible to use %2e and %2f sequences to perform path traversal attack.

Developers using webpack-dev-server or webpack-dev-middleware are affected by the issue. When the project is started an attacker might access any file on the developer’s machine and exfiltrate the content. If the development server is listening on a public IP address (or 0.0.0.0) an attacker on the local network can access the local files without any interaction from the victim (direct connection to the port). If the server allows access from third-party domains an attacker can send a malicious link to the victim. When visited the client side script can connect to the local server and exfiltrate the local files. Starting with fixed versions 7.1.0 6.1.2 and 5.3.4 the URL is unescaped and normalized before any further processing.

Reference

https://github.com/webpack/webpack-dev-middleware/security/advisories/GHSA-wr3j-pwj9-hqq6 https://github.com/webpack/webpack-dev-middleware/commit/189c4ac7d2344ec132a4689e74dc837ec5be0132 https://github.com/webpack/webpack-dev-middleware/commit/9670b3495da518fe667ff3428c5e4cb9f2f3d353 https://github.com/webpack/webpack-dev-middleware/commit/e10008c762e4d5821ed6990348dabf0d4d93a10e https://github.com/webpack/webpack-dev-middleware/blob/7ed24e0b9f53ad1562343f9f517f0f0ad2a70377/src/utils/getFilenameFromUrl.js#L82 https://github.com/webpack/webpack-dev-middleware/blob/7ed24e0b9f53ad1562343f9f517f0f0ad2a70377/src/utils/setupOutputFileSystem.js#L21 https://github.com/webpack/webpack-dev-middleware/releases/tag/v5.3.4 https://github.com/webpack/webpack-dev-middleware/releases/tag/v6.1.2 https://github.com/webpack/webpack-dev-middleware/releases/tag/v7.1.0