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engine.io Uncaught Exception vulnerability

Moderate severity GitHub Reviewed Published May 1, 2023 in socketio/engine.io • Updated Nov 11, 2023

Package

npm engine.io (npm)

Affected versions

>= 5.1.0, < 6.4.2

Patched versions

6.4.2

Description

Impact

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

TypeError: Cannot read properties of undefined (reading 'handlesUpgrades')
    at Server.onWebSocket (build/server.js:515:67)

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

Patches

A fix has been released today (2023/05/02): 6.4.2

This bug was introduced in version 5.1.0 and included in version 4.1.0 of the socket.io parent package. Older versions are not impacted.

For socket.io users:

Version range engine.io version Needs minor update?
socket.io@4.6.x ~6.4.0 npm audit fix should be sufficient
socket.io@4.5.x ~6.2.0 Please upgrade to socket.io@4.6.x
socket.io@4.4.x ~6.1.0 Please upgrade to socket.io@4.6.x
socket.io@4.3.x ~6.0.0 Please upgrade to socket.io@4.6.x
socket.io@4.2.x ~5.2.0 Please upgrade to socket.io@4.6.x
socket.io@4.1.x ~5.1.1 Please upgrade to socket.io@4.6.x
socket.io@4.0.x ~5.0.0 Not impacted
socket.io@3.1.x ~4.1.0 Not impacted
socket.io@3.0.x ~4.0.0 Not impacted
socket.io@2.5.0 ~3.6.0 Not impacted
socket.io@2.4.x and below ~3.5.0 Not impacted

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 Thomas Rinsma from Codean for the responsible disclosure.

References

@darrachequesne darrachequesne published to socketio/engine.io May 1, 2023
Published to the GitHub Advisory Database May 3, 2023
Reviewed May 3, 2023
Published by the National Vulnerability Database May 8, 2023
Last updated Nov 11, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS score

0.192%
(58th percentile)

Weaknesses

CVE ID

CVE-2023-31125

GHSA ID

GHSA-q9mw-68c2-j6m5

Source code

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