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Uncaught Exception in engine.io

High
darrachequesne published GHSA-273r-mgr4-v34f Jan 12, 2022

Package

npm engine.io (npm)

Affected versions

>= 4.0.0, <= 4.1.1
>= 5.0.0, <= 5.2.0
>= 6.0.0, <= 6.1.0

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
[email protected] 4.1.2
[email protected] 5.2.1
[email protected] 6.1.1

Previous versions (< 4.0.0) are not impacted.

For socket.io users:

Version range engine.io version Needs minor update?
[email protected] ~6.1.0 -
[email protected] ~6.0.0 Please upgrade to [email protected]
[email protected] ~5.2.0 -
[email protected] ~5.1.1 Please upgrade to [email protected]
[email protected] ~5.0.0 Please upgrade to [email protected]
[email protected] ~4.1.0 -
[email protected] ~4.0.0 Please upgrade to [email protected] or [email protected] (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.

Severity

High

CVE ID

CVE-2022-21676

Weaknesses

Credits