Information disclosure in Parceljs Parcel
CVE-2018-14731
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.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.023 (82.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 83rd percentile — 82.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.023 · newest: 0.023 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/parcel-bundler/parcel/issues/1783 (Vendor Advisory)
- blog.cal1.cn/post/Sniffing Codes in Hot Module Reloading Messages (Exploit, Third Party Advisory)
- github.com/parcel-bundler/parcel/pull/1794 (Exploit, Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2018-14731?
- CVE-2018-14731 is a high-severity vulnerability in Parceljs Parcel, classified under Information Disclosure. CVSS score: 7.5/10. Published 2018-09-21.
- How severe is CVE-2018-14731?
- High severity. CVSS v3 base score is 7.5 out of 10.