Denial of Service (DoS)

Affecting engine.io package, versions <1.0.0

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Overview

engine.io is the implementation of transport-based cross-browser/cross-device bi-directional communication layer for Socket.IO. It provides the foundation of a bidirectional connection between client and server.

Affected versions of the package are vulnerable to Denial of Service (DoS) by sending many upgrade events. A client could possibly create a lot of intervals without the old ones having a chance of being cleared.

Details

Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.

Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.

One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.

When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.

Two common types of DoS vulnerabilities:

  • High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.

  • Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm ws package

Remediation

Upgrade engine.io to version 1.0.0 or higher.

References

CVSS Score

5.3
medium severity
  • Attack Vector
    Network
  • Attack Complexity
    High
  • Privileges Required
    None
  • User Interaction
    Required
  • Scope
    Unchanged
  • Confidentiality
    None
  • Integrity
    None
  • Availability
    High
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Credit
Nils Kuhnhenn
CWE
CWE-400
Snyk ID
npm:engine.io:20140212
Disclosed
11 Feb, 2014
Published
15 Nov, 2016