Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS0yNWhjLXFjZzYtMzh3as4AA9LC

socket.io has an unhandled 'error' event

Impact

A specially crafted Socket.IO packet can trigger an uncaught exception on the Socket.IO server, thus killing the Node.js process.

node:events:502
    throw err; // Unhandled 'error' event
    ^

Error [ERR_UNHANDLED_ERROR]: Unhandled error. (undefined)
    at new NodeError (node:internal/errors:405:5)
    at Socket.emit (node:events:500:17)
    at /myapp/node_modules/socket.io/lib/socket.js:531:14
    at process.processTicksAndRejections (node:internal/process/task_queues:77:11) {
  code: 'ERR_UNHANDLED_ERROR',
  context: undefined
}

Affected versions

Version range	Needs minor update?
4.6.2...latest	Nothing to do
3.0.0...4.6.1	Please upgrade to [email protected] (at least)
2.3.0...2.5.0	Please upgrade to [email protected]

Patches

This issue is fixed by https://github.com/socketio/socket.io/commit/15af22fc22bc6030fcead322c106f07640336115, included in [email protected] (released in May 2023).

The fix was backported in the 2.x branch today: https://github.com/socketio/socket.io/commit/d30630ba10562bf987f4d2b42440fc41a828119c

Workarounds

As a workaround for the affected versions of the socket.io package, you can attach a listener for the "error" event:

io.on("connection", (socket) => {
  socket.on("error", () => {
    // ...
  });
});

For more information

If you have any questions or comments about this advisory:

• Open a discussion here

Thanks a lot to Paul Taylor for the responsible disclosure.

References

• https://github.com/socketio/socket.io/commit/15af22fc22bc6030fcead322c106f07640336115
• https://github.com/socketio/socket.io/commit/d30630ba10562bf987f4d2b42440fc41a828119c

Permalink: https://github.com/advisories/GHSA-25hc-qcg6-38wj
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS0yNWhjLXFjZzYtMzh3as4AA9LC
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: 5 months ago
Updated: 3 days ago

CVSS Score: 7.3
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Identifiers: GHSA-25hc-qcg6-38wj, CVE-2024-38355
References:

• https://github.com/socketio/socket.io/security/advisories/GHSA-25hc-qcg6-38wj
• https://github.com/socketio/socket.io/commit/15af22fc22bc6030fcead322c106f07640336115
• https://github.com/socketio/socket.io/commit/d30630ba10562bf987f4d2b42440fc41a828119c
• https://nvd.nist.gov/vuln/detail/CVE-2024-38355
• https://github.com/advisories/GHSA-25hc-qcg6-38wj

Repository: https://github.com/socketio/socket.io
Blast Radius: 44.8

Affected Packages