Vulnerability Description
An issue was discovered in HMRServer.js in Parcel parcel-bundler. Attackers are able to steal developer's code because the origin of requests is not checked by the WebSocket server, which is used for HMR (Hot Module Replacement). Anyone can receive the HMR message sent by the WebSocket server via a ws://127.0.0.1 connection (with a random TCP port number) from any origin. The random port number can be found by connecting to http://127.0.0.1 and reading the "new WebSocket" line in the source code.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Parceljs | Parcel | - |
Related Weaknesses (CWE)
References
- https://blog.cal1.cn/post/Sniffing%20Codes%20in%20Hot%20Module%20Reloading%20MesExploitThird Party Advisory
- https://github.com/parcel-bundler/parcel/issues/1783Vendor Advisory
- https://github.com/parcel-bundler/parcel/pull/1794ExploitPatchVendor Advisory
- https://blog.cal1.cn/post/Sniffing%20Codes%20in%20Hot%20Module%20Reloading%20MesExploitThird Party Advisory
- https://github.com/parcel-bundler/parcel/issues/1783Vendor Advisory
- https://github.com/parcel-bundler/parcel/pull/1794ExploitPatchVendor Advisory
FAQ
What is CVE-2018-14731?
CVE-2018-14731 is a vulnerability with a CVSS score of 7.5 (HIGH). An issue was discovered in HMRServer.js in Parcel parcel-bundler. Attackers are able to steal developer's code because the origin of requests is not checked by the WebSocket server, which is used for ...
How severe is CVE-2018-14731?
CVE-2018-14731 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2018-14731?
Check the references section above for vendor advisories and patch information. Affected products include: Parceljs Parcel.