CVE-2018-14731 Information

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 Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Reference

https://blog.cal1.cn/post/Sniffing20Codes20in20Hot20Module20Reloading20Messages https://github.com/parcel-bundler/parcel/issues/1783 https://github.com/parcel-bundler/parcel/pull/1794

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

7.5