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Uncaught Exception in engine.io

high severity GitHub Reviewed Published Jan 13, 2022 in socketio/engine.io • Updated Jan 17, 2022
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Package

npm engine.io (npm)

Affected versions

>= 4.0.0, < 4.1.2
>= 5.0.0, < 5.2.1
>= 6.0.0, < 6.1.1

Patched versions

4.1.2
5.2.1
6.1.1

Description

Impact

A specially crafted HTTP request can trigger an uncaught exception on the Engine.IO server, thus killing the Node.js process.

RangeError: Invalid WebSocket frame: RSV2 and RSV3 must be clear
at Receiver.getInfo (/.../node_modules/ws/lib/receiver.js:176:14)
at Receiver.startLoop (/.../node_modules/ws/lib/receiver.js:136:22)
at Receiver._write (/.../node_modules/ws/lib/receiver.js:83:10)
at writeOrBuffer (internal/streams/writable.js:358:12)

This impacts all the users of the engine.io package starting from version 4.0.0, including those who uses depending packages like socket.io.

Patches

A fix has been released for each major branch:

Version range Fixed version
engine.io@4.x.x 4.1.2
engine.io@5.x.x 5.2.1
engine.io@6.x.x 6.1.1

Previous versions (< 4.0.0) are not impacted.

For socket.io users:

Version range engine.io version Needs minor update?
socket.io@4.4.x ~6.1.0 -
socket.io@4.3.x ~6.0.0 Please upgrade to socket.io@4.4.x
socket.io@4.2.x ~5.2.0 -
socket.io@4.1.x ~5.1.1 Please upgrade to socket.io@4.4.x
socket.io@4.0.x ~5.0.0 Please upgrade to socket.io@4.4.x
socket.io@3.1.x ~4.1.0 -
socket.io@3.0.x ~4.0.0 Please upgrade to socket.io@3.1.x or socket.io@4.4.x (see here)

In most cases, running npm audit fix should be sufficient. You can also use npm update engine.io --depth=9999.

Workarounds

There is no known workaround except upgrading to a safe version.

For more information

If you have any questions or comments about this advisory:

Thanks to Marcus Wejderot from Mevisio for the responsible disclosure.

References

@darrachequesne darrachequesne published the maintainer security advisory Jan 12, 2022

CVE ID

CVE-2022-21676

CVSS Score

7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Credits